Industrial Environment Switching Regulators, PCB & Chassis PSR Series PSR: Positive Switching Regulators PSR-Series No input to output isolation Single output of 5, 12, 15, 24 or 36 V DC/15...72 W Input voltage up to 80 V DC * High efficiency up to 94% * Wide input voltage range * Low input to output differential voltage * Very good dynamic properties * Input undervoltage lock-out * Parallel configurations possible 25 1.0" 50 2.0" * Continuous no-load and short-circuit proof 70 2.8" * No derating Safety according to IEC/EN 60950 C Summary The PSR series of positive switching regulators is designed as power supply modules for electronic systems. Their major advantages include a high level of efficiency that remains virtually constant over the entire input range, high reliability, low ripple and excellent dynamic response. Modules with input voltages up to 80 V are specially designed for secondary switched and battery driven applications. The case design allows operation at nominal load up to 71C without additional cooling. Type Survey and Key Data Table 1: Type survey 1 Efficiency 2 Output voltage Uo nom [V] Output current Io nom [A] Input voltage range Ui [V] 1 Input voltage Ui nom [V] Type designation Options min [%] typ [%] 5 5 7...35 20 81 83 PSA 55-7 -9, i, P, R, Y 5 4 7...40 20 82 83 PSR 54-7 -9, i, P, R, Y 5 3 8...80 40 77 79 PSR 53-7 -9, i, P, R, Y 5 2 8...80 40 72 74 PSR 52-7 Y 12 2.5 15...80 40 86 87 PSR 122.5-7 -9, i, P, R, Y 15 2.5 19...80 40 88 89 PSR 152.5-7 -9, i, P, R, Y 24 2 29...80 50 91 92 PSR 242-7 -9, i, P, R, Y 36 2 42...80 60 92 94 PSR 362-7 -9, i, P, R, Y 2 See also: Electrical Input Data: DUio min. Efficiency at Ui nom and Io nom. Non standard input/output configurations or special custom adaptions are available on request. See also: Commercial Information: Inquiry Form for Customized Power Supply. Table of Contents Page Page Summary .......................................................................... 1 Type Survey and Key Data .............................................. 1 Type Key .......................................................................... 2 Functional Description ..................................................... 2 Electrical Input Data ........................................................ 3 Electrical Output Data ...................................................... 4 Auxiliary Functions .......................................................... 5 Electromagnetic Compatibility (EMC) ............................. 6 Immunity to Environmental Conditions ........................... 7 Mechanical Data .............................................................. 8 Safety and Installation Instructions ................................. 8 Description of Options ................................................... 10 Accessories ................................................................... 11 MELCHER The Power Partners. Edition 4/4.99 1/11 PSR Series Switching Regulators, PCB & Chassis Industrial Environment Type Key PSR 12 2.5 -7 i R P Y Positive switching regulator in case A01 ..................... PSR Nominal output voltage in volt ................................... 5...36 Nominal output current in ampere ............................... 2...5 Operational ambient temperature range TA -25...71C ........................................................... -7 -40...71C (option) .............................................. -9 Options: Inhibit input ............................................................ i Control input for output voltage adjustment 1 ....... R Potentiometer 1 ..................................................... P PCB soldering pins 0.5 x 1.0 mm ......................... Y 1 Option R excludes option P and vice versa. Example: PSR 122.5-7iPY = A positive switching regulator with a 12 V, 2.5 A output, ambient temperature range of -25...71C, inhibit input, potentiometer and PCB soldering pins. Functional Description The switching regulators are designed using the buck converter topology. See also: Technical Information: Topologies. The input is not electrically isolated from the output. During the on period of the switching transistor, current is transferred to the output and energy is stored in the output choke in the form of flux. During the off period, this energy forces the current to continue flowing through the output, to the load and back through the freewheeling diode. Regulation is accomplished by varying the on to off duty ratio of the power switch. These regulators are ideal for a wide range of applications, where input to output isolation is not necessary, or where already provided by an external front end (e.g. a transformer with rectifier). To optimise customer's needs, additional options and accessories are available. 03015 Io Input Filter Ii Ui Vo+ Vi+ i (option) Control circuit Ce Uo R (option) Go- Gi- Option P Fig. 1 Block diagram MELCHER The Power Partners. Edition 4/4.99 2/11 Industrial Environment Switching Regulators, PCB & Chassis PSR Series Electrical Input Data General Conditions: TA = 25C, unless TC is specified Table 2a: Input data Input Characteristics Ui Conditions Operating input voltage DUio min Min. diff. voltage Ui - Uo 1 Io = 0...Io nom TC min...TC max Ui o Undervoltage lock-out Ii 0 No load input current Io = 0, Ui min...Ui max I inr p Peak value of inrush current Ui nom t inr r t inr h ui RFI Input RFI level, EN 55011/22 Ui nom, Io nom 0.01...30 MHz PSA 55 PSR 54 PSR 53 PSR 52 min typ max min typ max min typ max min typ max 7 35 7 40 2 8 80 2 6.3 80 3 6.3 45 8 V DC 3 7.3 45 Unit 7.3 40 40 mA 75 75 150 150 A Rise time 2.5 2.5 2.5 2.5 s Time to half-value 15 15 15 15 B2 B2 B3 B3 Table 2b: Input data Input Characteristics Ui Conditions Operating input voltage DUio min Min. diff. voltage Ui - Uo 1 1 2 3 Io = 0...Io nom TC min...TC max Ui o Undervoltage lock-out Ii 0 No load input current Io = 0, Ui min...Ui max I inr p Peak value of inrush current Ui nom t inr r PSR 122.5 PSR 152.5 PSR 242 PSR 362 min typ max min typ max min typ max min typ max 15 19 29 42 80 80 3 7.3 80 4 5 7.3 35 80 6 12 35 Unit V DC 19 35 40 mA 150 150 150 150 A Rise time 2.5 2.5 2.5 2.5 s t inr h Time to half-value 15 ui RFI Input RFI level, EN 55011/22 Ui nom, Io nom 0.01...30 MHz 15 B3 15 B3 15 B3 B3 The minimum differential voltage DUio min between input and output increases linearly by 0 to 1 V between TA = 46C and 71C (TC = 70 C and 95C) With input filter FP 38 (connected between Uii and Gi, see: Accessory Products) and Ce = 470 F/40 V With input filter FP 80 (connected between Uii and Gi, see: Accessory Products) and Ce = 470 F/100 V External Input Circuitry The sum of the lengths of the supply lines to the source or to the nearest capacitor 100 F or to the nearest external input filter which includes such a capacitor (a + b) should not exceed 0.3 m (0.5 m twisted). An external input filter (FP 38 or FP 80, see: Accessory Products) is recommended in order to prevent power line oscillations and reduce superimposed interference voltages. See also: Technical Information: Application Notes. MELCHER The Power Partners. 04016 + Vi+ Vo+ Gi- Go- a b Fig. 2 Switching regulator with long supply lines. Edition 4/4.99 3/11 PSR Series Switching Regulators, PCB & Chassis Industrial Environment Electrical Output Data General Conditions: - TA = 25C, unless TC is specified - With R or option P, output voltage Uo = Uo nom at Io nom Table 3a: Output data Output PSA 55 PSR 54 PSR 53 PSR 52 Characteristics Conditions min typ max min typ max min typ max min typ max Uo Ui nom, Io nom 4.97 5.03 4.97 5.03 4.97 5.03 4.97 5.03 V 0 5.0 3 0 4.0 0 3.0 0 2.0 A 5.0 6.5 4.0 5.2 3.0 3.9 2.0 2.6 Output voltage current 1 Io Output IoL Output current limitation response 1 uo Output voltage noise Switching freq. Total Ui min...Ui max TC min...TC max Ui nom, Io nom IEC/EN 61204 2 BW = 20 MHz 20 35 15 25 20 35 20 35 24 39 19 29 24 39 24 39 30 45 30 45 30 45 30 45 25 20 25 20 25 20 25 DUo U Static line regulation Ui min...Ui max, Io nom DUo l Static load regulation Ui nom, Io = 0...Io nom 20 uo d Dynamic load regulation Ui nom Io nom 1/3 Io nom IEC/EN 61204 2 250 200 100 100 40 40 50 50 td aUo Voltage deviat. Recovery time Temperature coefficient DUo/DTC (TC min...TC max) Ui min...Ui max Io = 0...Io nom 1 1 1 0.02 0.02 0.02 Unit mVpp mV s 1 mV/K 0.02 %/K Table 3b: Output data Output Characteristics Conditions Uo Ui nom, Io nom Output voltage Io Output IoL Output current limitation response 1 uo Output voltage noise 3 Total PSR 242 PSR 362 min typ max min typ max min typ max min typ max 11.93 12.07 14.91 15.09 23.86 24.14 35.78 V A 0 2.5 0 2.5 0 2.0 0 2.0 2.5 3.25 2.5 3.25 2.0 2.6 2.0 2.6 Ui nom, Io nom IEC/EN 61204 2 BW = 20 MHz 30 45 40 75 45 95 80 160 35 50 44 80 50 100 85 165 50 75 70 100 150 220 200 270 45 40 Ui min...Ui max, Io nom DUo l Static load regulation Ui nom, Io = 0...Io nom 35 120 160 125 160 uo d Dynamic load regulation Ui nom Io nom 1/3 Io nom IEC/EN 61204 2 180 180 210 250 60 60 80 100 Voltage deviat. Recovery time Temperature coefficient DUo/DTC (TC min...TC max) Ui min...Ui max Io = 0...Io nom 2 3 5 0.02 0.02 0.02 See also: Thermal Considerations. See: Technical Information: Measuring and Testing. Linear derating from 5 to 4 A between TA = 61C and 71C (TC = 85C and 95C). Uo 05010 uod DU o I td DU o I uod td t I o/I o nom 1 0 10 s 10 s t Fig. 3 Dynamic load regulation. MELCHER The Power Partners. 55 Edition 4/4.99 4/11 Unit 36.22 Static line regulation aUo 2 Switching freq. Ui min...Ui max TC min...TC max PSR 152.5 DUo U td 1 current 1 PSR 122.5 mVpp mV s 8 mV/K 0.02 %/K Industrial Environment Switching Regulators, PCB & Chassis PSR Series Thermal Considerations Parallel and Series Connection When a switching regulator is located in free, quasi-stationary air (convection cooling) at a temperature TA = 71C and is operated at its nominal output current Io nom, the case temperature TC will be about 95C after the warm-up phase, measured at the Measuring point of case temperature TC (see: Mechanical Data). Outputs of equal nominal voltages can be parallel-connected. However, the use of a single unit with higher output power, because of its power dissipation, is always a better solution. Under practical operating conditions, the ambient temperature TA may exceed 71C, provided additional measures (heat sink, fan, etc.) are taken to ensure that the case temperature TC does not exceed its maximum value of 95C. Example: Sufficient forced cooling allows TA max = 85C. A simple check of the case temperature TC (TC 95C) at full load ensures correct operation of the system. Outputs can be series-connected with any other module. In series-connection the maximum output current is limited by the lowest current limitation. Electrically separated source voltages are needed for each module! Short Circuit Behaviour Io /Io nom 05031 1.0 Convection cooling Io nom A constant current limitation circuit holds the output current almost constant whenever an overload or a short circuit is applied to the regulator's output. It acts self-protecting and recovers - in contrary to the fold back method - automatically after removal of the overload or short circuit condition. Forced cooling 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 In parallel-connected operation, one or several outputs may operate continuously at their current limit knee-point which will cause an increase of the heat generation. Consequently, the max. ambient temperature value should be reduced by 10 K. Uo /Uo nom TC max 1.2 05033 1.0 0.8 Io L 0.6 TA min 50 60 70 80 90 100 TA [C] 0.4 0.2 Fig. 4 Output current derating versus temperature 0 Output Protection A voltage suppressor diode which in worst case conditions fails into a short circuit, protects the output against an internally generated overvoltage. Such an overvoltage could occur due to a failure of either the control circuit or the switching transistor. The output protection is not designed to withstand externally applied overvoltages. The user should ensure that systems with Melcher power supplies, in the event of a failure, do not result in an unsafe condition (fail-safe). LED Output Voltage Indicator A yellow output indicator LED shines when the output voltage is higher than approx. 3 V. The LED output voltage indicator is not available for PSR 52. The Power Partners. 0.4 0.6 0.8 1.0 1.2 Fig. 5 Overload, short-circuit behaviour Uo versus Io. Auxiliary Functions MELCHER 0.2 Edition 4/4.99 5/11 1.4 Io /Io nom PSR Series Switching Regulators, PCB & Chassis Industrial Environment Electromagnetic Compatibility (EMC) Electromagnetic Immunity General condition: Case not earthed. Table 4: Immunity type tests Phenomenon Standard 1 Class Level Coupling mode 2 Value applied Waveform Source Imped. Test procedure 1 MHz burst disturbance IEC 60255-22-1 III i/o, i/c, o/c 2500 Vp 200 +i/-i, +o/-o 1000 Vp 400 damped 1 MHz waves/s 2 s per coupling mode Voltage surge IEC 60571-1 i/c, +i/-i 800 Vp 100 s 100 1500 Vp 50 s 3000 Vp 5 s 4000 Vp 1 s yes A yes B 10 positive and 10 negative discharges yes B4 26...1000 MHz yes A 1 min positive 1 min negative bursts per coupling mode yes A4 yes B4 2 5 pos. and 5 neg. surges per coupling mode 150 0.15...80 MHz yes A 1 pos. and 1 neg. voltage surge per coupling mode 7000 Vp 100 ns IEC/EN 61000-4-2 3 contact discharge to case 6000 Vp 1/50 ns Electromagnetic IEC/EN field 61000-4-3 2 antenna 3 V/m AM 80% 1 kHz Electrical fast transient/burst IEC/EN 61000-4-4 3 i/c, +i/-i 2000 Vp bursts of 5/50 ns 5 kHz rep. rate transients with 15 ms burst duration and a 300 ms period 50 Surge IEC/EN 61000-4-5 2 1.2/50 s 12 IEC/EN 61000-4-6 3 Electrostatic discharge Conducted disturbances 4 4000 Vp i/c 1000 Vp +i/-i 500 Vp i, o, signal wires 140 dBV (10 Vrms) 1 AM 80% 1 kHz In Peroper. form. 3 330 B4 For related and previous standards see: Technical Information: Safety & EMC. i = input, o = output, c = case. 3 A = Normal operation, no deviation from specifications, B = Normal operation, temporary deviation from specs possible. 4 External input filter FP 38 or FP 80 necessary. 2 Electromagnetic Emission For emission levels refer to: Electrical Input Data. [dBV] 90 07011 80 EN 55022 A 70 EN 55022 B 60 50 40 30 20 10 20 30 10 5 2 1 0.5 0.1 0.05 MHz 0.02 0.01 0 Fig. 6 Typical disturbance voltage (quasi-peak) at the input according to EN 55011/22 measured at Ui nom and Io nom. MELCHER The Power Partners. Edition 4/4.99 6/11 Industrial Environment Switching Regulators, PCB & Chassis PSR Series Immunity to Environmental Conditions Table 5: Mechanical stress Test Method Standard Test Conditions Status Damp heat steady state IEC/DIN IEC 60068-2-3 MIL-STD-810D section 507.2 Temperature: Relative humidity: Duration: 40 2 C Ea Shock (half-sinusoidal) IEC/EN/DIN EN 60068-2-27 MIL-STD-810D section 516.3 Acceleration amplitude: Bump duration: Number of bumps: 100 gn = 981 m/s2 6 ms 18 (3 each direction) Unit operating Eb Bump (half-sinusoidal) IEC/EN/DIN EN 60068-2-29 MIL-STD-810D section 516.3 Acceleration amplitude: Bump duration: Number of bumps: 40 gn = 392 m/s2 6 ms 6000 (1000 each direction) Unit operating Fc Vibration (sinusoidal) IEC/EN/DIN EN 60068-2-6 MIL-STD-810D section 514.3 Acceleration amplitude: Frequency (1 Oct/min): Test duration: 0.7 mm (10...60 Hz) Unit 10 gn = 98 m/s2 (60...2000 Hz) operating 10...2000 Hz 7.5 h (2.5 h each axis) Ca Unit not operating 93 +2/-3 % 56 days Fda Random vibration wide band Reproducibility high IEC 60068-2-35 DIN 40046 part 23 Acceleration spectral density: Frequency band: Acceleration magnitude: Test duration: 0.2 g 2/Hz 20...500 Hz 9.8 grms 3 h (1 h each axis) Unit operating Kb Salt mist, cyclic (sodium chloride NaCl solution) IEC/EN/DIN IEC 60068-2-52 Concentration: Duration: Storage: Storage duration: Number of cycles: 5% (30C) 2 h per cycle 40C, 93% rel. humidity 22 h per cycle 3 Unit not operating Table 6: Temperature specifications, valid for air pressure of 800...1200 hPa (800...1200 mbar) Temperature Standard -7 Characteristics 1 2 Conditions 1 TA Ambient temperature TC Case temperature TS Storage temperature 1 Operational 2 Non operational Option -9 min max min max Unit -25 71 -40 71 C -25 95 -40 95 -40 100 -55 100 MIL-STD-810D section 501.2 and 502.2 See: Thermal Considerations Table 7: MTBF and device hours MTBF Ground Fixed MTBF acc. to MIL-HDBK-217D 1 Ground Mobile TC = 40C TC = 70C TC = 40C TC = 70C 160'000 70'000 h 45'000 h 22'000 h Statistical values, based on an average of 4300 working hours per year and in general field use. MELCHER The Power Partners. Edition 4/4.99 7/11 Device Hours 1 5'100'000 h PSR Series Switching Regulators, PCB & Chassis Industrial Environment Mechanical Data Dimensions in mm. Tolerances 0.3 mm unless otherwise specified. 20.5 8.75 18.7 6.3 Yellow LED output voltage indicator Potentiometer (option P) 09015 1.2 European Projection 70.2 0.5 47.5 0.2 65 12.2 R Gi- 8.4 Vo+ i Go- O4 Vi+ 2.7 0.2 50.2 0.2 09016 71.4 Fig. 8 Case A01 hole locations for circuit board layout (component side view of PCB): - - - = Space reserved for switching regulator "a" = 3.0 mm x 0.7 mm slot or O 3.0 mm, through plated for hand or machine soldering (fast on) "a" = O 1.3...1.5 mm with option Y pins 65 Distance between M 2.5 mounting screws a Fig. 7 Case A01, weight 100 g Aluminium, black finish and self cooling 8.75 18.7 1.2 47.5 0.1 2.8 x 0.5 (1.0 x 0.5 option Y) 20.5 6.3 6.5 1 7 0.5 25.2 0.5 min. 5 Measuring point of case temperature 51.4 Safety and Installation Instructions Installation Instruction Cleaning Agents Installation of the switching regulators must strictly follow the national safety regulations in compliance with the enclosure, mounting, creepage, clearance, casualty, markings and segregation requirements of the end-use application. In order to avoid possible damage, any penetration of cleaning fluids is to be prevented, since the power supplies are not hermetically sealed. Check for hazardous voltages before altering any connections. Connections can be made using fast-on or soldering technique. The input and the output circuit are not separated, i.e. the negative path is internally interconnected! The units should be connected to a secondary circuit. Do not open the module. Ensure that a unit failure (e.g. by an internal short-circuit) does not result in a hazardous condition. See also: Safety of operator accessible output circuit. MELCHER The Power Partners. Protection Degree The protection degree is IP 40, IP 20 with option P and for PSR 52. Isolation Electric strength test voltage between input interconnected with output and case: 750 V DC, 1 s. This test is performed as factory test in accordance with IEC/EN 60950 and UL 1950 and should not be repeated in the field. Melcher will not honour any guarantee claims resulting from electric strength field tests. Edition 4/4.99 8/11 Industrial Environment Switching Regulators, PCB & Chassis PSR Series Standards and Approvals Safety of Operator Accessible Output Circuit All switching regulators are UL recognized according to UL 1950, UL 1012 and EN 60950, UL recognized for Canada to CAN/CSA C22.2 No. 234-M90 and SEV approved to IEC/EN 60950 and EN 55014 standards. If the output circuit of a switching regulator is operator-accessible, it shall be an SELV circuit according to IEC/EN 60950 related safety standards The units have been evaluated for: * Building in, * Operational insulation from input to output and input/ output to case, * The use in an overvoltage category II environment, * The use in a pollution degree 2 environment. The switching regulators are subject to manufacturing surveillance in accordance with the above mentioned UL and CSA and with ISO 9001 standards. The following table shows some possible installation configurations, compliance with which causes the output circuit of the switching regulator to be an SELV circuit according to IEC/EN 60950 up to a nominal output voltage of 30 V. However, it is the sole responsibility of the installer or user to assure the compliance with the relevant and applicable safety regulations. More information is given in: Technical Information: Safety & EMC. Table 8: Insulation concept leading to an SELV output circuit Conditions Front end Supply voltage Minimum required grade of isolation, to be provided by the AC-DC front end, including mains supplied battery charger Battery Double or Reinforced supply, considered as secondary circuit Mains Basic 250 V AC Double or reinforced 1 2 3 4 5 Switching regulator Result Maximum DC output voltage from the front end 1 Minimum required safety status of the front end output circuit Measures to achieve the specified safety status of the output circuit Safety status of the switching regulator output circuit 60 V SELV circuit None SELV circuit >60 V 60 V fuse 3 earthed 4 Earthed hazardous voltage Input and secondary circuit 2 or non accessible case 5 Earthed SELV circuit Unearthed hazardous voltage secondary circuit 5 Input fuse 3 and unearthed, non accessible case 5 Hazardous voltage secondary circuit Input fuse 3 and earthed output Earthed SELV circuit 4 and earthed 4 or non circuit accessible case 5 Earthed SELV circuit 4 None ELV circuit Input fuse 3 and earthed output circuit 4 and earthed 4 or non accessible case 5 >60 V Hazardous voltage secondary circuit 60 V SELV circuit >60 V Double or reinforced insu- Input fuse 3 and unearthed lated unearthed hazardous and non accessible case 5 voltage secondary circuit 5 None Unearthed SELV circuit SELV circuit Unearthed SELV circuit The front end output voltage should match the specified input voltage range of the switching regulator. The conductor to the Gi- terminal of the switching regulator has to be connected to earth by the installer according to the relevant safety standard, e.g. IEC/EN 60950. The installer shall provide an approved fuse (slow blow type with the lowest current rating suitable for the application, max. 12.5 A) in a non-earthed input conductor directly at the input of the switching regulator. If Vo+ is earthed, insert the fuse in the Gi- line. For UL's purpose, the fuse needs to be UL-listed. If option C is fitted, a suitable fuse is already built-in in the Vi+ line. The earth connection has to be provided by the installer according to the relevant safety standard, e.g. IEC/EN 60950. Has to be insulated from earth by double or reinforced insulation according to the relevant safety standard, based on the maximum output voltage from the front end. MELCHER The Power Partners. Edition 4/4.99 9/11 PSR Series Switching Regulators, PCB & Chassis Industrial Environment Description of Options i Inhibit for Remote On and Off Iinh [mA] U inh Fig. 10 Definition of Iinh and Uinh 2 0.1 0 Uo on 1 Uo off 0 20 10 30 t tf tr Inhibit 1 0 -50 -40 -30 -20 -10 06001 Uo /Uo nom 1 Uinh = 2.4 V Uinh = 0.8 V 3 Go- Gi- 06010 4 I inh i The inhibit input allows the switching regulator output to be disabled via a control signal. In systems with several units, this feature can be used, for example, to control the activation sequence of the regulators by a logic signal (TTL, CMOS, etc.). An output voltage overshoot will not occur when switching on or off. 5 06009 Vo+ Vi+ Note: With open i-input, output is enabled (Uo = on). Not available for PSR 52. 40 50 Uinh [V] Fig. 9 Typical inhibit current Iinh versus inhibit voltage Uinh t 0 Fig. 11 Output response as a function of inhibit signal Table 9: Inhibit characteristics Characteristics Uinh Inhibit input voltage to keep regulator output voltage... Uo = on Uo = off Conditions min max Unit Ui min...Ui max TC min...TC max -10 typ +0.8 V DC +2.4 +50 tr Switch-on time after inhibit command Switch-off time after inhibit command Ui = Ui nom RL = Uo nom /Io nom 2 tf Ii inh Input current when inhibited Ui = Ui nom 10 R Control for Output Voltage Adjustment R Uref 4000 + Uext + - G Go - Fig. 12 Voltage adjustment with Uext between R and Go- a) Without option Y: Uo = 0...108% Uo nom, using Uext 2.5 V * Uo Uext Uext ----------- Uo 1.08 Uo nom * ----- 2.5 V 1.08 * Uo nom b) With option Y: Uo = 0...108% Uo nom 2.5 V * Uo Uext Uext --------- Uo Uo nom * ----- Uo nom 2.5 V MELCHER The Power Partners. 06036 Uref R2 4000 R The output voltage Uo can either be adjusted with an external voltage (Uext) or with an external resistor (R1 or R2). The adjustment range is 0...108% of Uo nom. The minimum differential voltage DUio min between input and output (see: Electrical Input Data) should be maintained. Under-voltage lock-out = Minimum input voltage. 06035 mA Vo+ Note: With open R input, Uo 1.08 Uo nom. (Exception: With option Y, Uo 1.00 Uo nom) Option R excludes option P and vice versa. Not available for PSR 52. Vo+ ms 4 + - R1 G Go - Fig. 13 Voltage adjustment with external resistor R1 or R2 c) Without option Y: Uo = 0...108% Uo nom, using R1 4000 * Uo 1.08 * Uo nom * R1 R1 -------------- Uo -------------- R1 + 4000 1.08 * Uo nom - Uo d) With option Y: Uo = 0...100% Uo nom, using R1 4000 * Uo Uo nom * R1 R1 ----------- Uo ----------- Uo nom - Uo R1 + 4000 e) With option Y: Uo = 100...108% Uo nom, using R2 4000 * Uo * (Uo nom - 2.5 V) R2 ------------------------ 2.5 V * (Uo - Uo nom) Uo nom * 2.5 V * R2 Uo -------------------------------- 2.5 V * (R2 + 4000 ) - Uo nom * 4000 Caution: To prevent damage Uext should not exceed 20 V, nor be negative and R2 should never be less than 47 k. Edition 4/4.99 10/11 Industrial Environment -9 Switching Regulators, PCB & Chassis Extended Temperature Range P PSR Series Potentiometer Note: Not available for PSR 52. Note: Not available for PSR 52. The operational ambient temperature range is extended to TA = -40...71C. (TC = -40...95C, TS = -55...100C.) Option P excludes option R. The output voltage Uo can be adjusted with a screwdriver in the range from 0.92...1.08 of the nominal output voltage Uo nom. Y PCB Soldering Pins This option defines soldering pins of 1.0 x 0.5 x 6.5 mm, instead of the standard fast-on terminals of 2.8 x 0.5 x 6.5 mm. Modules with this option can be mounted onto printed circuit boards, providing through-plated finished hole size of O 1.3...1.5 mm. However, the minimum differential voltage DUi o min between input and output voltages as specified in: Electrical Input Data should be maintained. The combination of option Y with option R will result in a different setting of the output voltage (see also description of: R Control). Accessories A variety of electrical and mechanical accessories are available including: - Isolation pads for easy and safe PCB-mounting. - Filters and ring core chockes for ripple and interference reduction. - Adaptor kit for DIN-rail and chassis mounting. MELCHER The Power Partners. Edition 4/4.99 11/11