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Part: SG3524Y
Category:
RF & Microwaves
-> Modulators
Description: Regulating Pulse-width Modulators
Company: Texas Instruments, Inc.
Datasheet: Download SG3524Y datasheet File size : 1010 kB
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Datasheet text preview:
SG2524, SG3524 REGULATING PULSE-WIDTH MODULATORS
SLVS077B APRIL 1977 REVISED JULY 1999
D D D D
Complete PWM Power Control Circuitry Uncommitted Outputs for Single-Ended or Push-Pull Applications Low Standby Current . . . 8 mA Typ Interchangeable With Silicon General SG2524 and SG3524
D OR N PACKAGE (TOP VIEW)
description
The SG2524 and SG3524 incorporate all the 10 7 functions required in the construction of a 9 8 regulating power supply, inverter, or switching regulator on a single chip. They also can be used as the control element for high-power-output applications. The SG2524 and SG3524 were designed for switching regulators of either polarity, transformer-coupled dc-to-dc converters, transformerless voltage doublers, and polarity converter applications employing fixed-frequency, pulse-width-modulation (PWM) techniques. The complementary output allows either single-ended or push-pull application. Each device includes an on-chip regulator, error amplifier, programmable oscillator, pulse-steering flip-flop, two uncommitted pass transistors, a high-gain comparator, and current-limiting and shut-down circuitry. The SG2524 is characterized for operation from 25°C to 85°C, and the SG3524 is characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS TA 0°C to 70°C 25°C to 85°C INPUT REGULATION MAX (MV) 30 20 PACKAGED DEVICES SMALL OUTLINE (D) SG3524D SG2524D PLASTIC DIP (N) SG3524N SG2524N CHIP FORM FORM (Y) SG3524Y --
IN IN + OSC OUT CURR LIM + CURR LIM RT CT GND
1 2 3 4 5 6
16 15 14 13 12 11
REF OUT VCC EMIT 2 COL 2 COL 1 EMIT 1 SHUTDOWN COMP
The D package is available taped and reeled. Add the suffix R to the device type (e.g., SG3524DR). Chip forms are tested at 25°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
Copyright © 1999, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SG2524, SG3524 REGULATING PULSE-WIDTH MODULATORS
SLVS077B APRIL 1977 REVISED JULY 1999
functional block diagram
VCC 15 Reference Regulator Vref Vref 12 11 13 14 3 Vref COL 1 EMIT 1 COL 2 EMIT 2 OSC OUT 16 REF OUT
Vref RT 6 Oscillator Vref IN IN+ COMP CURR LIM + CURR LIM 2 9 4 5 10 1 k 10 k 8 GND NOTE A: Resistor values shown are nominal. Vref + 1
T
CT 7
Comparator Error Amplifier
SHUTDOWN
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V Collector output current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 mA Reference output current, IO(ref) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Current through CT terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 mA Package thermal impedance, JA (see Notes 3 and 4): D package . . . . . . . . . . . . . . . . . . . . . . . . . . 112°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88°C/W Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values are with respect to network ground terminal. 2. The reference regulator may be bypassed for operation from a fixed 5-V supply by connecting the VCC and reference output pin both to the supply voltage. In this configuration, the maximum supply voltage is 6 V. 3. Maximum power dissipation is a function of TJ(max), JA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) TA)/JA. Operation at the absolute maximum TJ of 150°C can impact reliability. 4. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages which use a trace length of zero.
2
+
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SG2524, SG3524 REGULATING PULSE-WIDTH MODULATORS
SLVS077B APRIL 1977 REVISED JULY 1999
recommended operating conditions
SG2524 MIN Supply voltage, VCC Reference output current Current through CT terminal Timing resistor, RT Timing capacitor, CT Operating free-air temperature 8 0 0.03 1.8 0.001 25 MAX 40 50 2 100 0.1 85 SG3524 MIN 8 0 0.03 1.8 0.001 0 MAX 40 50 2 100 0.1 70 UNIT V mA mA k µF °C
electrical characteristics over recommended operating free-air temperature range, VCC = 20 V, f = 20 kHz (unless otherwise noted) reference section
PARAMETER Output voltage Input regulation Ripple rejection Output regulation Output voltage change with temperature Short-circuit output current§ VCC = 8 V to 40 V f = 120 Hz IO = 0 mA to 20 mA TA = MIN to MAX Vref = 0 TEST CONDITIONS CONDITIONS SG2524 MIN TYP 4.8 5 10 66 20 0.3% 100 50 1% MAX 5.2 20 SG3524 MIN TYP 4.6 5 10 66 20 0.3% 100 50 1% 100 mA MAX 5.4 30 SG3524Y MIN TYP MAX 5 10 66 20 UNIT V mV dB mV
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. All typical values, except for temperature coefficients, are at TA = 25°C § Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:
s
+
n
+1
N
* X) N*1
(x n
2
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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