PTH05000W --5-V Input 6-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module SLTS201C - MAY 2003 - REVISED DECEMBER 2003 Features NOMINAL SIZE = 0.75 in x 0.5 in (19,05 mm x 12,7 mm) * Up to 6-A Output Current * 5-V Input Voltage * Wide-Output Voltage Adjust (0.9 V to 3.6 V) * Efficiencies up to 94 % * 160 W/in Power Density * On/Off Inhibit * Under-Voltage Lockout * * * * * * Output Current Limit Pre-Bias Startup Capability Over-Temperature Protection Surface Mountable Operating Temp: -40 to +85 C Safety Agency Approvals (Pending): UL 1950, CSA 22.2 950, EN60950 & VDE Description Pin Configuration The PTH05000 series of non-isolated power modules are small in size and high on performance. Using double-sided surface mount construction and synchronous rectification technology, these regulators deliver up to 6 A of output current while occupying a PCB area of about half the size of a standard postage stamp. They are an ideal choice for applications where space, performance and cost are important design constraints. The series operates from an input voltage of 5 V to provide step-down power conversion to any output voltage over the range, 0.9 V to 3.6 V. The output voltage of the PTH05000W is set within this range using a single resistor. Operating features include an on/off inhibit, output voltage adjust (trim), an output current limit, and over-temperature protection. For high efficiency these parts employ a synchronous rectifier output stage. An output pre-bias holdoff capability ensures that the output will not sink current during startup. Target applications include telecom, industrial, and general purpose circuits, including low-power dual-voltage systems that use a DSP, microprocessor, or ASIC. Package options include both throughhole and surface mount configurations. Pin 1 2 3 4 5 * Denotes negative logic: Open = Output On Ground = Output Off Standard Application Rset = Required to set the output voltage to a value higher than 0.9 V. See spec. table for values. C in = Required 330 F capacitor C out = Optional 100 F capacitor 1 VIN 2 PTH05000W (Top View) 3 CIN 330 F (Required) VOUT 5 4 RSET 1 %, 0.1 W (Required) COUT 100 F Electrolytic (Optional) Inhibit GND For technical support and further information visit http://power.ti.com Function GND Vin Inhibit * Vo Adjust Vout GND PTH05000W --5-V Input 6-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module SLTS201C - MAY 2003 - REVISED DECEMBER 2003 Ordering Information Output Voltage (PTH05000Hxx) Package Options (PTH05000xHH) (1) Code W Code Voltage 0.9 V - 3.6 V (Adjust) AH AS Description Pkg Ref. Horiz. T/H SMD, Standard (3) (2) (EUS) (EUT) Notes: (1) Add "T" to end of part number for tape and reel on SMD packages only. (2) Reference the applicable package reference drawing for the dimensions and PC board layout (3) "Standard" option specifies 63/37, Sn/Pb pin solder material. Pin Descriptions Vin: The positive input voltage power node to the module, which is referenced to common GND. Vout: The regulated positive power output with respect to the GND node. GND: This is the common ground connection for the `Vin' and `Vout' power connections. It is also the 0 VDC reference for the `Inhibit' and `Vo Adjust' control input. Inhibit: The Inhibit pin is an open-collector/drain negative logic input that is referenced to GND. Applying a lowlevel ground signal to this input disables the module's output and turns off the output voltage. When the Inhibit control is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left opencircuit, the module will produce an output whenever a valid input source is applied. Vo Adjust: A 0.1 W 1 % resistor must be directly connected between this pin and the GND pin to set the output voltage to a value higher than 0.9 V. The temperature stability of the resistor should be 100 ppm/C (or better). The set point range for the output voltage is from 0.9 V to 3.6 V. The resistor required for a given output voltage may be calculated from the following formula. If left open circuit, the output voltage will default to its lowest value. For further information on output voltage adjustment, consult the related application note. Rset = 10 k * 0.891 V Vout - 0.9 V - 3.24 k The specification table gives the preferred resistor values for a number of standard output voltages. For technical support and further information visit http://power.ti.com PTH05000W --5-V Input 6-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module SLTS201C - MAY 2003 - REVISED DECEMBER 2003 Environmental & Absolute Maximum Ratings Characteristics Symbols Conditions Min Typ Max Units Operating Temperature Range Solder Reflow Temperature Storage Temperature Over Temperature Protection Mechanical Shock Ta Treflow Ts OTP Over Vin Range Surface temperature of module body or pins -- IC junction temperature Per Mil-STD-883D, Method 2002.3 1 msec, 1/2 sine, mounted Mil-STD-883D, Method 2007.2 20-2000 Hz -40 (i) -- -40 -- -- 150 +85 235 (ii) +125 -- C C C C -- 500 -- G's -- 20 -- G's -- 2 -- grams Mechanical Vibration Weight Flammability -- -- Meets UL 94V-O Notes: (i) For operation below 0 C the external capacitors must have stable characteristics. Use either a low ESR tantalum, Os-con, or ceramic capacitor. (ii) During reflow of SMD package version do not elevate peak temperature of the module, pins or internal components above the stated maximum. Electrical Specifications Unless otherwise stated, T a =25 C, Vin =5 V, V o =3.3 V, C in =330 F, C out =0 F, and Io =Io (max) Characteristics Symbols Conditions Output Current Io 0.9 V Vo 3.6 V, Input Voltage Range Set-Point Voltage Tolerance Temperature Variation Line Regulation Load Regulation Total Output Variation Vin Vo tol Regtemp Regline Regload Regtot Over Io range Efficiency Vo = 3.3 V Vo = 2.5 V Vo = 2.0 V Vo = 1.8 V Vo = 1.5 V Vo = 1.2 V Vo = 1.0 V Vo 3.3 V Vo 2.5 V 1 A/s load step, 50 to 100 % Iomax, Vo =1.8 V, Cout =100 F Recovery time Vo over/undershoot Vo = -50 mV Vin increasing Vin decreasing Referenced to GND Vo Ripple (pk-pk) Vr Transient Response Current Limit Under-Voltage Lockout ttr Vtr Ilim UVLO Inhibit Control (pin 3) Input High Voltage Input Low Voltage Input Low Current VIH VIL IIL Standby Input Current Switching Frequency External Input Capacitance External Output Capacitance Iin standby s Cin Cout Reliability MTBF Min Ta =25 C, natural convection Ta =60 C, 200LFM -40 C <Ta < +85 C Over Vin range Over Io range Includes set-point, line, load, -40 C T a +85 C Vin =5 V, Io =4 A RSET = 475 RSET = 2.32 k RSET = 4.87 k RSET = 6.65 k RSET = 11.5 k RSET = 26.1 k RSET = 84.5 k 20 MHz bandwidth Pin 3 to GND pins 1 & 3 connected Over Vin and Io ranges Capacitance value non-ceramic ceramic Equiv. series resistance (non-ceramic) Per Bellcore TR-332 50 % stress, Ta =40 C, ground benign PTH05000W Typ Max Units 0 0 4.5 -- -- -- -- -- -- -- -- 0.5 5 5 6 (1) 5.25 (1) 5.5 2 (2) -- -- -- A V %Vo %Vo mV mV -- -- 3 (2) %Vo -- -- -- -- -- -- -- -- -- 92 90 88 87 84 82 79 30 25 -- -- -- -- -- -- -- -- -- -- -- -- -- 3.4 70 100 13 3.8 3.5 -- -- -- 4.3 -- Vin -0.5 -0.2 -- -- -- 330 (4) 0 0 4 (7) -- -- -10 1 700 -- 100 -- -- Open (3) 0.8 -- -- -- -- 1,000 (6) 300 -- V 28 -- -- 106 Hrs (5) % mVpp Sec mV A V A mA kHz F F m Notes: (1) See SOA curves or consult factory for appropriate derating. (2) The set-point voltage tolerance is affected by the tolerance and stability ofRSET . The stated limit is unconditionally met if RSET has a tolerance of 1 % with 100 ppm/C or better temperature stability. (3) The Inhibit control (pin 3) has an internal pull-up to Vin, and if left open-circuit the module will operate when input power is applied. A small lowleakage (<100 nA) MOSFET is recommended to control this input. See application notes for more information. (4) The regulator requires a minimum of 330 F input capacitor with a minimum 300 mArms ripple current rating. For further information, consult the related application note on Capacitor Recommendations. (5) An external output capacitor is not required for basic operation. Adding 100 F of distributed capacitance at the load will improve the transient response. (6) This is the calculated maximum. The minimum ESR limitation will often result in a lower value. Consult the application notes for further guidance. (7) This is the typical ESR for all the electrolytic (non-ceramic) output capacitance. Use 7 m as the minimum when using max-ESR values to calculate. For technical support and further information visit http://power.ti.com PTH05000W --5-V Input Typical Characteristics 6-A, 5-V Input Non-Isolated Wide-Output Adjust Power Module Characteristic Data; Vin =5 V SLTS201C - MAY 2003 - REVISED DECEMBER 2003 Safe Operating Area; Vin =5 V (See Note A) Efficiency vs Output Current All Output Voltages 100 90 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V 1.0 V 80 70 60 Ambient Temperature (C) 80 VOUT 90 Efficiency - % (See Note B) Airflow 70 400LFM 200LFM 100LFM Nat Conv 60 50 40 30 50 20 0 1 2 3 4 5 6 0 Iout - Amps 1 2 3 4 5 6 Iout (A) Ripple vs Output Current 50 VOUT Ripple - mV 40 3.3 V 2.5 V 2.0 V 1.8 V 1.5 V 1.2 V 1.0 V 30 20 10 0 0 1 2 3 4 5 6 Iout - Amps Power Dissipation vs Output Current 3 2.5 Pd - Watts 2 1.5 1 0.5 0 0 1 2 3 4 5 6 Iout - Amps Note A: Characteristic data has been developed from actual products tested at 25 C. This data is considered typical data for the Converter. Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer's maximum operating temperatures. Derating limits apply to modules soldered directly to a 4 in. x 4 in. double-sided PCB with 1 oz. copper. For technical support and further information visit http://power.ti.com Application Notes PTH05000W Capacitor Recommendations for the PTH05000W Wide-Output Adjust Power Modules Input Capacitor The recommended input capacitor(s) is determined by the 330 F minimum capacitance and 300 mArms minimum ripple current rating. Ripple current, less than 300 m equivalent series resistance (ESR), and temperature are the major considerations when selecting input capacitors. Unlike polymer tantalum, regular tantalum capacitors have a recommended minimum voltage rating of 2 x (maximum DC voltage + AC ripple). This is standard practice to ensure reliability. For improved ripple reduction on the input bus, ceramic capacitors [2] may used to complement electrolytic types, and achieve the minimum required capacitance. Output Capacitors (Optional) For applications with load transients (sudden changes in load current), regulator response will benefit from an external output capacitance. The recommended output capacitance of 100 F will allow the module to meet its transient response specification (see product data sheet). For most applications, a high quality computer-grade aluminum electrolytic capacitor is adequate. These capacitors provide decoupling over the frequency range, 2 kHz to 150 kHz, and are suitable for ambient temperatures above 0 C. For operation below 0 C tantalum, ceramic or Os-Con type capacitors are recommended. When using one or more non-ceramic capacitors, the calculated equivalent ESR should be no lower than 4 m (7 m using the manufacturer's maximum ESR for a single capacitor). A list of preferred low-ESR type capacitors are identified in Table 1-1. Ceramic Capacitors Above 150 kHz the performance of aluminum electrolytic capacitors becomes less effective. To further improve the reflected input ripple current [2] or the output transient response, multilayer ceramic capacitors can also be added. Ceramic capacitors have very low ESR and their resonant frequency is higher than the bandwidth of the regulator. When used on the output their combined ESR is not critical as long as the total value of ceramic capacitance does not exceed 300 F. Also, to prevent the formation of local resonances, do not place more than five identical ceramic capacitors in parallel with values of 10 F or greater. Tantalum Capacitors Tantalum type capacitors can be used at both the input and output, and are recommended for applications where the ambient operating temperature can be less than 0 C. The AVX TPS, Sprague 593D/594/595 and Kemet T495/ For technical support and further information visit http://power.ti.com T510 capacitor series are suggested over many other tantalum types due to their higher rated surge, power dissipation, and ripple current capability. As a caution many general purpose tantalum capacitors have considerably higher ESR, reduced power dissipation and lower ripple current capability. These capacitors are also less reliable as they have lower power dissipation and surge current ratings. Tantalum capacitors that do not have a stated ESR or surge current rating are not recommended for power applications. When specifying Os-Con and polymer tantalum capacitors for the output, the minimum ESR limit will be encountered well before the maximum capacitance value is reached. Capacitor Table Table 1-1 identifies the characteristics of capacitors from a number of vendors with acceptable ESR and ripple current (rms) ratings. The recommended number of capacitors required at both the input and output buses is identified for each capacitor type. This is not an extensive capacitor list. Capacitors from other vendors are available with comparable specifications. Those listed are for guidance. The RMS ripple current rating and ESR (at 100 kHz) are critical parameters necessary to insure both optimum regulator performance and long capacitor life. Designing for Very Fast Load Transients The transient response of the DC/DC converter has been characterized using a load transient with a di/dt of 1 A/s. The typical voltage deviation for this load transient is given in the data sheet specification table using the optional value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent limitation with any DC/DC converter once the speed of the transient exceeds its bandwidth capability. If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with additional output capacitor decoupling. In these cases special attention must be paid to the type, value and ESR of the capacitors selected. If the transient performance requirements exceed that specified in the data sheet, the selection of output capacitors becomes more important. For further guidance consult the separate application note, "Selecting Output Capacitors for PTH Products in High-Performance Applications." Application Notes continued PTH05000 Series Table 1-1: Input/Output Capacitors Capacitor Vendor, Type/ Series (Style) Capacitor Characteristics Quantity Working Voltage Value (F) Max. ESR at 100 kHz Max. Ripple Current at 85 C (Irms) Physical Size (mm) Input Bus Output Bus 10 V 16 V 16 V 10 V 330 F 330 F 330 F 330 F 0.035 0.150 0.160 0.117 2800mA 670mA 600 mA 550 mA 8x6.9 10x10.2 8x10.2 8x11.5 1 1 1 1 3 3 3 3 EEFWA1A121P EEVFC1C331P EEVFK1C331P EEUFC1A331 United Chemi-Con PXA, Poly-Alum (SMD) FS, Os-con (Radial) LXZ, Aluminum (Radial) MVZ, Alumimun (SMD) PSA, Poly-Aluminum (Radial) 10 V 10 V 16 V 25 V 6.3 V 330 F 330 F 330 F 330 F 390 F 0.024 0.025 0.120 0.170 0.008 3770 mA 3500 mA 555 mA 450 mA 5080 mA 10x7.7 10x10.5 8x12 8x10 8x11.5 1 1 1 1 1 3 3 3 3 1 PXA10VC331MJ80TP 10FS330M LXZ16VB331M8x12LL MVZ25VC331MH10TP PSA6.3VB390MH11 NichiconAluminum WG (SMD) PM (Radial) 16 V 10 V 330 F 330 F 0.150 0.160 670 mA 460 mA 10x10 8x11.5 1 1 3 3 UWG1C331MNR1GS UPM1A331MHH Sanyo SVP, Os-con (SMD) SP, Os-con (Radial) TPE, Poscap Polymer (SMD) 10 V 10 V 6.3 V 330 F 470 F 330 F 0.025 0.015 0.025 3700 mA 4500 mA 2400 mA 10x8 10x10.5 7.3Lx4.3W 1 1 1 3 2 3 10SVP330MX 10SP470M 6TPE330ML AVX Tantalum TPS (SMD) 10 V 10 V 330 F 330 F 0.100 0.060 1100 mA 2000 mA 7.3L x4.3W x4.1H 1 1 3 3 TPSV337M010R0100 TPSV337M010R0060 Kemet (SMD) T520, Poly Aluminum T530, Organic Poly- Alum. 10 V 10 V 330 F 330 F 0.040 0.015 1200 mA 1100 mA 7.3L x5.7W x4.0H 1 1 3 2 T520X337M010AS T530X337M010AS Vishay-Sprague 594D, Tantalum (SMD) 595D, Tantalum (SMD) 94SVP, Os-con (SMD) 94SA, Os-con (Radial) 10 V 10 V 6.3 V 6,3 V 330 F 330 F 330 F 330 F 0.045 0.140 0.025 0.025 1400 mA 1000 mA 3300 mA 3500 mA 7.3L x6.0W x4.1H 10x8 10x10.5 1 1 1 1 3 3 3 3 594D337X0010R2T 595D337X0010D2T 94SVP337X06R3F8 94SA337X06R3FBP Kemet, Ceramic X5R (SMD) 16 V 6.3 V 10 47 0.002 0.002 -- 1210 case 3225 mm 1 [2] 1 [2] 3 2 C1210C106M4PAC C1210C476K9PAC Murata, Ceramic X5R (SMD) 6.3 V 6.3 V 16 V 16 V 100 47 22 10 0.002 -- 1210 case 3225 mm 3 [1] 1 [2] 1 [2] 1 [2] 1 2 3 3 GRM32ER60J107M GRM32ER60J476M GRM32ER61C226K GRM32DR61C106K TDK, Ceramic X5R (SMD) 6.3 V 6.3 V 16 V 16 V 100 47 22 10 0.002 -- 1210 case 3225 mm 3 [1] 1 [2] 1 [2] 1 [2] 1 2 3 3 C3225X5R0J107MT C3225X5R0J476MT C3225X5R1C226MT C3225X5R1C106MT Panasonic WA, Poly-Aluminum (SMD) FC, Aluminum (SMD) FK, Aluminum (SMD) FC, Aluminum (Radial) Vendor Number [1] A total capacitance of 300 F is acceptable based on the surge current capability of ceramic capacitors. [2] A ceramic capacitor may be used to complement electrolytic types at the input to further reduce high-frequency ripple current. For technical support and further information visit http://power.ti.com Application Notes PTH05000W Adjusting the Output Voltage of the PTH05000W Wide-Output Adjust Power Modules The Vo Adjust control (pin 4) sets the output voltage of the PTH05000Wproduct. The adjustment range is from 0.9 V to 3.6 V. The adjustment method requires the addition of a single external resistor, Rset, that must be connected directly between the Vo Adjust and GND pins 1. Table 2-1 gives the preferred value of the external resistor for a number of standard voltages, along with the actual output voltage that this resistance value provides. For other output voltages the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 2-2. Figure 2-1 shows the placement of the required resistor. Rset = 10 k * 0.891 V Vout - 0.9 V - 3.24 k Table 2-1; Preferred Values of Rset for Standard Output Voltages Vout (Standard) Rset (Pref'd Value) 3.3 V 2.5 V 2V 1.8 V 1.5 V 1.2 V 1V 0.9 V 475 2.32 k 4.87 k 6.65 k 11.5 k 26.1 k 84.5 k Open Vout (Actual) 3.298V 2.502 V 1.999 V 1.801 V 1.504 V 1.204 V 1.001 V 0.9 V Figure 2-1; Vo Adjust Resistor Placement Table 2-2; Output Voltage Set-Point Resistor Values Va Req'd 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 1.125 1.150 1.175 1.200 1.225 1.250 1.275 1.300 1.325 1.350 1.375 1.400 1.425 1.450 1.475 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 Rset Open 353 k 175 k 116 k 85.9 k 68.0 k 56.2 k 47.7 k 41.3 k 36.4 k 32.4 k 29.2 k 26.5 k 24.2 k 22.2 k 20.5 k 19.0 k 17.7 k 16.6 k 15.5 k 14.6 k 13.7 k 13.0 k 12.3 k 11.6 k 10.5 k 9.49 k 8.64 k 7.90 k 7.24 k 6.66 k 6.14 k 5.67 k 5.25 k Va Req'd 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 2.50 2.55 2.60 2.65 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 3.60 Rset 4.86 k 4.51 k 4.19 k 3.89 k 3.61 k 3.36 k 3.12 k 2.90 k 2.70 k 2.51 k 2.33 k 2.16 k 2.00 k 1.85 k 1.71 k 1.58 k 1.45 k 1.33 k 1.22 k 1.11 k 1.00 k 904 810 720 634 551 473 397 324 254 187 122 60 4 V O Adj 2 VIN PTH05000W Inhibit CIN 330F (Required) 3 VO 5 VOUT GND 1 RSET 0.1 W, 1 % + VIN COUT 100F (Optional) + Inhibit GND For technical support and further information visit http://power.ti.com GND Notes: 1. Use a 0.1 W resistor. The tolerance should be 1 %, with a temperature stability of 100 ppm/C (or better). Place the resistor as close to the regulator as possible. Connect the resistor directly between pins 4 and 1 using dedicated PCB traces. 2. Never connect capacitors from Vo Adjust to either GND or Vout. Any capacitance added to the Vo Adjust pin will affect the stability of the regulator. Application Notes PTH03000 & PTH05000 Series Power-Up Characteristics When configured per their standard application, the PTH03000 and PTH05000 series of power modules will produce a regulated output voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input source. The soft-start circuitry introduces a short time delay (typically 10 ms) into the power-up characteristic. This is from the point that a valid input source is recognized. Figure 3-1 shows the power-up waveforms for a PTH05000W (5-V input), with the output voltage set point adjusted for a 2-V output. The waveforms were measured with a 5-A resistive load. The initial rise in input current when the input voltage first starts to rise is the charge current drawn by the input capacitors. Figure 3-1 Vin (2 V/Div) Output On/Off Inhibit For applications requiring output voltage on/off control, the PTH03000W & PTH05000W power modules incorporate an output on/off Inhibit control (pin 3). The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off. The power module functions normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to Vin with respect to GND. Figure 3-2 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit control has its own internal pull-up to Vin potential. An open-collector or open-drain device is recommended to control this input. Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then turned off, the module will execute a soft-start power-up sequence. A regulated output voltage is produced within 20 msec. Figure 3-3 shows the typical rise in the output voltage, following the turn-off of Q1. The turn off of Q1 corresponds to the fall in the waveform, Q1 Vgs. The waveforms were measured with a 5-A resistive load. Vo (1 V/Div) Figure 3-2 4 VO Adj VIN =5 V 2 PTH05000W Inhibit + HORIZ SCALE: 5 ms/Div Current Limit Protection The PTHxx000W modules protect against load faults with a continuous current limit characteristic. Under a load fault condition the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limit value causes the output voltage to be progressively reduced. Current is continuously supplied to the fault until it is removed. Upon removal of the fault, the output voltage will promptly recover. Thermal Shutdown Thermal shutdown protects the module's internal circuitry against excessively high temperatures. A rise in temperature may be the result of a drop in airflow, a high ambient temperature, or a sustained current limit condition. If the junction temperature of the internal components exceed 150 C, the module will shutdown. This reduces the output voltage to zero. The module will start up automatically, by initiating a soft-start power up when the sensed temperature decreases 10 C below the thermal shutdown trip point. For technical support and further information visit http://power.ti.com VO =2 V 5 VIN CIN 330 F (Required) Q1 BSS138 3 VO GND + Iin (2 A/Div) 1 COUT 100 F (Optional) 4k87 0.1 W, 1 % Inhibit GND GND Figure 3-3 Vo (1 V/Div) Q1 Vgs (10 V/Div) HORIZ SCALE: 5 ms/Div L O A D Application Notes PTH05000W PTH05000W Startup with Output Pre-Bias 2. To ensure that the regulator does not sink current, the input voltage must always be greater or equal to the output voltage throughout the power-up and power-down sequence. A pre-bias startup condition occurs as a result of an external voltage being present at the output of the power module prior to its output voltage rising. This often occurs in complex digital systems when current from another power source is backfed through a dual-supply logic component such as an FPGA or ASIC. Another path might be via clamp diodes (to a higher supply voltage) as part of a sequential power-up arrangement. 3. If during power up, the backfeeding source is greater than the module's set-point voltage, the module's output voltage will remain higher than its set point. The output will remain out of regulation until the backfeeding source is either reduced in voltage or removed. An output prebias can cause problems with power modules that incorporate synchronous rectifiers. This is because under most operating conditions, they can sink as well as source ouput current. Although the PTH05000W (5-V input) power module can sink current under normal operation, it will not do so during startup. 1 This is true as long as certain conditions are maintained. 2 Figure 3-1 shows an application schematic that demonstrates this capability. Figure 3-2 shows the waveforms of the circuit after input power is applied. Note that the module's output current (Io) is never negative. Only positive current is sourced. This occurs when the output voltage is raised above that which is backfed from the 5-V input supply, via the diodes D1 through D4. 3 Figure 3-2; Start-up with Output Pre-Bias Vin (1 V/Div) Vo (1 V/Div) Io (2 A/Div) Notes 1. Start up includes both the application of a valid input source voltage, or the removal of a ground signal from the Inhibit* control (pin 3) with a valid input source applied. The output of the regulator is effectively off (tri-state), during the period that the Inhibit* control is held low. HORIZ SCALE: 5 ms/Div Figure 3-1; Schematic Demonstrating Startup with Output Pre-Bias D 1 - D4 MUR460 4 V O Adj 2 V IN PTH05000W Inhibit 3 CIN 330 F (Required) VO 5 VO =2.5 V GND 1 + VIN =5 V 2k32 0.1 W, 1 % C OUT 100 F (Optional) L O A D 0.55 Resistive + Inhibit GND GND For technical support and further information visit http://power.ti.com PACKAGE OPTION ADDENDUM www.ti.com 5-May-2011 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Qty Eco Plan (2) Lead/ Ball Finish MSL Peak Temp (3) Samples (Requires Login) PTH05000WAD ACTIVE ThroughHole Module EUS 5 56 Pb-Free (RoHS) SN N / A for Pkg Type PTH05000WAH ACTIVE ThroughHole Module EUS 5 56 Pb-Free (RoHS) SN N / A for Pkg Type PTH05000WAS ACTIVE Surface Mount Module EUT 5 49 TBD SNPB Level-1-235C-UNLIM/ Level-3-260C-168HRS PTH05000WAST ACTIVE Surface Mount Module EUT 5 250 TBD SNPB Level-1-235C-UNLIM/ Level-3-260C-168HRS PTH05000WAZ ACTIVE Surface Mount Module EUT 5 49 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR PTH05000WAZT ACTIVE Surface Mount Module EUT 5 250 Pb-Free (RoHS) SNAGCU Level-3-260C-168 HR (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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