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Part: SG3524J
Category:
Power Management
-> PWM Power Supply
-> Voltage Mode
Description: ti SG3524, Regulating Pulse-width Modulators
Company: Texas Instruments, Inc.
Datasheet: Download SG3524J datasheet File size : 1010 kB
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Datasheet text preview:
SG2524, SG3524 REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
D Complete Pulse-Width Modulation (PWM) D D D
Power-Control Circuitry Uncommitted Outputs for Single-Ended or Push-Pull Applications Low Standby Current . . . 8 mA Typ Interchangeable With Industry Standard SG2524 and SG3524
SG2524 . . . D OR N PACKAGE SG3524 . . . D, N, OR NS PACKAGE (TOP VIEW)
description/ordering information
The SG2524 and SG3524 incorporate all the 9 8 functions required in the construction of a 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 shutdown circuitry. ORDERING INFORMATION
TA INPUT REGULATION MAX (mV) PACKAGE PDIP (N) 0°C to 70°C to 70°C 30 SOIC (D) (D) SOP (NS) PDIP (N) 25°C to 85°C 20 SOIC (D) (D) Tube of 25 Tube of 40 Reel of 2500 Reel of 2000 Tube of 25 Tube of 40 Reel of 2500 ORDERABLE PART NUMBER SG3524N SG3524D SG3524DR SG3524NSR SG2524N SG2524D SG2524DR SG2524 SG3524 SG3524 SG2524N TOP-SIDE MARKING SG3524N
IN IN+ OSC OUT CURR LIM+ CURR LIM RT CT GND
1 2 3 4 5 6 7
16 15 14 13 12 11 10
REF OUT VCC EMIT 2 COL 2 COL 1 EMIT 1 SHUTDOWN COMP
Package drawings, standard packing quantities, thermal data, symboliztion, and PCB design guidelines are available at www.ti.com/sc/package.
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 2003, Texas Instruments Incorporated
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
1
SG2524, SG3524 REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
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 GND 8 Vref + 1
T
CT 7
Comparator Error Amplifier
SHUTDOWN
NOTE A: Resistor values shown are nominal.
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 Operating virtual junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C Package thermal impedance, JA (see Notes 3 and 4): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . 73°C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67°C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . 64°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 (REF OUT) 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 51-7.
2
+
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
SG2524, SG3524 REGULATING PULSE WIDTH MODULATORS
SLVS077D APRIL 1977 REVISED FEBRUARY 2003
recommended operating conditions
MIN VCC Supply voltage Reference output current Current through CT terminal RT CT TA Timing resistor Timing capacitor SG2524 Operating free-air temperature free air temperature SG3524 8 0 0.03 1.8 0.001 25 0 MAX 40 50 2 100 0.1 85 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 TEST CONDITIONS CONDITIONS SG2524 MIN TYP 4.8 5 10 66 20 0.3% 50 1% MAX 5.2 20 SG3524 MIN TYP 4.6 5 10 66 20 0.3% 50 1% mA MAX 5.4 30 UNIT V mV dB mV
Vref = 0 100 100 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:
o
s+
n+1
N
(x n * X) 2 N*1
scillator section
PARAMETER fosc Oscillator frequency Standard deviation of frequency§ fosc Frequency change with voltage Frequency change with temperature Output amplitude at OSC OUT TEST CONDITIONS CT = 0.001 µF, RT = 2 k All values of voltage, temperature, resistance, and capacitance constant VCC = 8 V to 40 V, TA = MIN to MAX TA = 25°C CT = 0.01 µF, TA = 25°C 3.5 MIN TYP 450 5% 1% 2% V µs MAX UNIT kHz
tw Output pulse duration (width) at OSC OUT TA = 25°C 0.5 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 * X) 2 N*1
POST OFFICE BOX 655303
· DALLAS, TEXAS 75265
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