Henne errr ee rere eee ee eer em FAIRCHILD | A Schlumberger Company uATSHG 5 A Negative Adjustable Voltage Regulator Hybrid Products Description The A79HG is an adjustable 4-terminal negative voltage regulator capable of supplying in excess of ~5 A over a 24 V to 2.11 V output range. The HATSHG hybrid voltage regulator has been designed with all the inherent characteristics of the monolithic 4-terminal regulator; i.e., full thermal overload and short circuit protection. The wA79HG is packaged in a hermetically-sealed 4-pin TO-3 package providing 50 W power dissipation. The regulator consists of a monolithic chip driving a discrete-series pass element and short circuit detection transistors. = 5.0 A OUTPUT CURRENT ws INTERNAL CURRENT AND THERMAL OVERLOAD PROTECTION INTERNAL SHORT CIRCUIT CURRENT LIMIT LOW DROP-OUT VOLTAGE (TYPICALLY 2.2 V @ 5.0 A) @ 50 W POWER DISSIPATION Connection Diagram 4-Pin Metal Package COMMON 4 CONTROL 2 INPUT 4 - OUTPUT 3 @ ELECTRICALLY NEUTRAL CASE m STEEL TO-3 CASE (Top View) Order Information Type Package Code Part No. HATSHG Metal JA HATSHGSC uwAT9HG Metal JA utA7TQSHGSM Block Diagram V UNREGULATED SHORT CIRCUIT SENSE RESISTOR SHORT Sounce swureom | [] cmoun LIMIT ~ ~~ ~ ~s ~ START-UP VOLTAGE ~s CIRCUIT REFERENCE ERROR OUTPUT TRANSISTOR 3 4 OUTPUT CONTROL COMMONuA79HG Absolute Maximum Ratings Input Voltage internal Power Dissipation Maximum Input-to-Output Voltage Differential Operating Junction Temperature Range -40V Storage Temperature Range -55C to +150C 50 W @ 25C Case Pin Temperature (Soldering, 60 s) 300C -35 V 0C to +160C pAT9HG Electrical Characteristics Ty = 25C, Vin = 10 V and lout = 2.0 A unless otherwise specified. Limits Characteristic Min Typ Max Unit Condition Input Voltage Range 40 -7.0 Vv Nominal Output Voltage Range 24 2.11 |V Vin = Vout 5 V Output Voltage Tolerance 4 %(VouT)| -40 V <= Vin = -7V Line Regulation 0.4 1.0 %(VouT)| 40 V < Vin < -7 V : Vin = Vout 10 V, 9G, Load Regulation 0.7 1.0 %o(V OUT) 10 mA <Ioyt < -5.0A Control Pin Current 3.0 vA Quiescent Current 5.0 mA Vin = 10V . or -18V <= Vins -8.5V Ripple Rejection 50 dB Vout = 5 V, f= 120 Hz . 10 Hz < f <= 100 kHz, Output Noise Voltage 200 uv Vout = 5.0 V Dropout Voltage 2.2 Vv louT = -5A Short Circuit Current Limit -8 ~12 A Vin = 15V Control Pin Voltage _ _ = (Reference) 2.35 2.11 Vv VIN 10 V Typical Performance Curves Short Circuit Current Quiescent Current Dropout Voltage SHORT CIRCUIT CURRENT - A o -5 -10 -15 -20 -25 -30 ~35 INPUT VOLTAGE - V 60 3 50 40 POWER DISSIPATION W o 8 MINIMUM (NPUT-OUTPUT DIFFERENTIAL V 25 0 25 50 75 100. 125~=150 -25 0 25 50 75 100 125 (150 JUNCTION TEMPERATURE C CASE TEMPERATURE - CuA79HG a Typical Performance Curves (Cont.) Line Transient Response Vout = -5.0V = -30A fl o a oN o 0 S&S 8 ' I = x 3 Ss INPUT VOLTAGE V OUTPUT CHANGE - mv x 3 Qo oF 2093 4 ~5 PULSE WIDTH TIME ys Output Voitage Deviation vs Junction Temperature 50 i & OUTPUT VOLTAGE DEVIATION mV l g z -25 0 2 50 75 100 125 150 JUNCTION TEMPERATURE - C Maximum Power Dissipation A ~5 1 t 2 25C A | Va 75C I e QUIESCENT CURRENT mA & Qo -5 -10 ~15 -20 -25 -30 -35 ~40 INPUT VOLTAGE V Load Regulation 0 > 25C TSC 1 ~10 \ z t 125C 9 g = -20 aw Q we @ 5 -30 8 > t > & _40 2 6 -50 0 ~1 -2 -3 ~4 -5 OUTPUT CURRENT A Control Current vs Temperature O7 0.6 0s 04 0.3 0.2 CONTROL CURRENT ma ot 9 25 50 75 100 125 150 JUNCTION TEMPERATURE C 4-21 Load Transient Response Vout = -5.0 =-10V OUTPUT VOLTAGE CHANGE - Vv & \ I ~ oo LOAD CURRENT CHANGE A 8 1 2 3 64 5 PULSE WIDTH TIME us Differential Control Voitage vs Input Voltage Q 1 Fad o 4 Vcont mV i on = 2A = -5.0V -5.0 -10 ~18 -20 ~25 -wd INPUT VOLTAGE VuATSHG Basic Test Circuit, Adjustable Output Voltage 3 Vout 4 Vin nATSHG R1 | 2 + Cy = 2 uF CONTROL oh CL 2 10unF SOLID + 1 TANTALUM R2 MMON Ri +R2 co VOUT = VcoNnT R2 LL Design Considerations This device has thermal overload protection from excessive power and internal short circuit protection which limits the circuits maximum current. Thus, the device is protected from overload abnormalities. Although the internal power dissipation is limited, the junction temperature must be kept below the maximum specified temperature (150C). It is recommended by the manufacturer that the maximum junction temperature be kept as low as possible for increased reliability. To calculate the maximum junction temperature or heat sink required, the following thermal resistance values should be used. Package Typ Max 9JC 95C TO-3 1.8 25 Tmax) TA PD(MAX) = ~ @jc + OCA 8ca = 8cs + Asa Solving for Ty: Ty = Ta + Po (Buc + 9a) Where: Ty = Junction Temperature Ta = Ambient Temperature Pp = Power Dissipation yc = Junction-to-case thermal resistance Oca = Case-to-ambient thermal resistance 8cs = Case-to-heat sink thermal resistance 9sa = Heat sink-to-ambient thermal resistance The device is designed to operate without external compensation components. However, the amount of external filtering of these voltage regulators depends upon the circuit layout. If in a specific application the regulator is more than four inches from the filter capacitor, a 2 uF solid tantalum capacitor should be used at the input. A 1 uF capacitor should be used at the output to reduce transients created by fast switching loads, as seen in the basic test circuit. These filter capacitors must be located as close to the regulator as possible. Caution: Permanent damage can result from forcing the output voltage higher than the input voltage. A protection diode from output to input should be used if this condition exists. Voltage Output The device has an adjustable output voltage from ~2.11 to 24 V which can be programmed by the external resistor network (potentiometer or two fixed resistors) using the relationship: Ri+R2 Vout = VCONTROL\ R22, Example: If R1 = 02 and R2 = 5 kQ, then Vout = 2.11 V nominal. Or, if R1 = 12.8 kQ and R2 = 2.1 k2 then Vout = 16 V. Package Outline (S Package Steel) 1.551 (39 40) 1.531 (38 89) | .770 (19.56) - MAX | -293 (7 44) 273 (6 93) | SEATING ~ PLANE 424(1069) | ' f 067.0 70) MIN _ MAX .041 (1 04) .037 ( 940) _.| | DIA 1,197 (30 40) 1.177 (29 90) PIN 1 675 (17 14) -655 (16 64) 1225 (5.71) PIN 2 205 (5.21) 2 HOLES 440 (17 18) 481 Be) 420 (10 67) : AAG H 177 (45)R EB 2 PLACES 470 (11 94) ne DIA PIN PIN 3 CIRCLE PIN 4 \ 1 | a 1s 54 525 (13 34) MAX Notes All dimensions in inches bold and millimeters (parentheses) Pins are solder-dipped alloy 52