Texas Instruments SG2524D, SG2524DR, SG2524J, SG2524N, SG3524D Datasheet

CHIP FORM

SG2524, SG3524

REGULATING PULSE-WIDTH MODULATORS

SLVS077B – APRIL 1977 – REVISED JULY 1999

D

Complete PWM Power Control Circuitry

D

Uncommitted Outputs for Single-Ended or
Push-Pull Applications

D

Low Standby Current ...8 mA Typ

D

Interchangeable With Silicon General
SG2524 and SG3524

description

OSC OUT
CURR LIM+
CURR LIM–

The SG2524 and SG3524 incorporate all the
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 shut-down circuitry.

D OR N PACKAGE

(TOP VIEW)

IN–

1

IN+

2
3
4
5

RT

6

CT

7

GND

8

REF OUT

16

V

15

EMIT 2

14

COL 2

13

COL 1

12

EMIT 1

11

SHUTDOWN

10

COMP

9

CC

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

INPUT

T

A

0°C to 70°C 30 SG3524D SG3524N SG3524Y

–25°C to 85°C 20 SG2524D SG2524N —

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.

REGULATION

MAX (MV)

SMALL OUTLINE

PACKAGED DEVICES

PLASTIC DIP

(D)

(N)

(Y)

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

Copyright  1999, Texas Instruments Incorporated

1

SG2524, SG3524
REGULATING PULSE-WIDTH MODULATORS

SLVS077B – APRIL 1977 – REVISED JULY 1999

functional block diagram

V

CC

RT
CT

IN–

IN+

COMP

CURR LIM+

CURR LIM –

SHUTDOWN

GND

15

6
7

1
2

9

4
5

10

8

1 kΩ

10 kΩ

+
–

V

–

+

ref

V

Reference
Regulator

ref

V

ref

Oscillator

Error Amplifier

16

REF OUT

V

ref

V

ref

T

V

ref

Comparator

12

11
13

14

3

COL 1

EMIT 1
COL 2

EMIT 2
OSC OUT

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, I

Current through CT terminal –5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θJA (see Notes 3 and 4): D package 112°C/W. . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

†

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 T
allowable ambient temperature is PD = (T
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.

50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

O(ref)

N package 88°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

,

θ

J(max)

J(max)

– TA)/

, and TA. The maximum allowable power dissipation at any

JA

θ

. Operation at the absolute maximum TJ of 150°C can

JA

†

2

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UNIT

PARAMETER

TEST CONDITIONS

†

UNIT

SG2524, SG3524

REGULATING PULSE-WIDTH MODULATORS

SLVS077B – APRIL 1977 – REVISED JULY 1999

recommended operating conditions

SG2524 SG3524

MIN MAX MIN MAX

Supply voltage, V
Reference output current 0 50 0 50 mA
Current through CT terminal –0.03 –2 –0.03 –2 mA
Timing resistor , R
Timing capacitor , C
Operating free-air temperature –25 85 0 70 °C

CC

T

T

electrical characteristics over recommended operating free-air temperature range, VCC = 20 V,
f = 20 kHz (unless otherwise noted)

reference section

SG2524 SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX MIN TYP‡MAX

Output voltage 4.8 5 5.2 4.6 5 5.4 5 V
Input regulation VCC = 8 V to 40 V 10 20 10 30 10 mV
Ripple rejection f = 120 Hz 66 66 66 dB
Output regulation IO = 0 mA to 20 mA 20 50 20 50 20 mV
Output voltage change

with temperature
Short-circuit output

§

current

†

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:

TA = MIN to MAX 0.3% 1% 0.3% 1%

V

= 0 100 100 100 mA

ref

N

ȍ

Ǹ

s

+

(xn*

n+1

N*1

X)

2

8 40 8 40 V

1.8 100 1.8 100 kΩ

0.001 0.1 0.001 0.1 µF

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3

SG2524, SG3524

PARAMETER

TEST CONDITIONS

†

UNIT

∆f

PARAMETER

TEST

UNIT

REGULATING PULSE-WIDTH MODULATORS

SLVS077B – APRIL 1977 – REVISED JULY 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 20 V,
f = 20 kHz (unless otherwise noted)

oscillator section

SG2524, SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX

f

Oscillator frequency CT = 0.001 µF, RT = 2 kΩ 450 450 kHz

osc

Standard deviation of
frequency

Frequency change with
voltage

osc

Frequency change with
temperature

Output amplitude at OSC
OUT

Output pulse duration

t

w

(width) at OSC OUT

†

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:

§

All values of voltage, temperature,
resistance, and capacitance constant

VCC = 8 V to 40 V, TA = 25°C 1% 1%

TA = MIN to MAX 2%

TA = 25°C 3.5 3.5 V

CT = 0.01 µF, TA = 25°C 0.5 0.5 µs

N

ȍ

Ǹ

s

+

(xn*

n+1

N*1

X)

2

5% 5%

error amplifier section

TEST

CONDITIONS

V
I

IB

V

CMMR
B

†

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

Input offset voltage VIC = 2.5 V 0.5 5 2 10 2 mV

IO

Input bias current VIC = 2.5 V 2 10 2 10 2 µA
Open-loop voltage

amplification
Common-mode input

ICR

voltage range
Common-mode rejection

ratio
Unity-gain bandwidth 3 3 3 MHz

1

Output swing TA = 25°C 0.5 3.8 0.5 3.8 0.5 3.8 V

TA = 25°C

†

SG2524 SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX MIN TYP‡MAX

72 80 60 80 80 dB

1.8 to

3.4
70 70 70 dB

1.8 to

3.4

V

4

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PARAMETER

TEST CONDITIONS

†

UNIT

PARAMETER

TEST CONDITIONS

†

UNIT

VITInput threshold voltage at COMP

V

PARAMETER

TEST CONDITIONS

UNIT

V

(IN+)

V

(IN–)

PARAMETER

TEST CONDITIONS

UNIT

SG2524, SG3524

REGULATING PULSE-WIDTH MODULATORS

SLVS077B – APRIL 1977 – REVISED JULY 1999

electrical characteristics over recommended operating free-air temperature range, VCC = 20 V,
f = 20 kHz (unless otherwise noted)

output section

SG2534, SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX

V

(BR)CE

V

sat

V

O

t

r

t

f

†

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.

comparator section

I

IB

†

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.

Collector-emitter breakdown
voltage

Collector off-state current VCE = 40 V 0.01 50 0.01 µA
Collector-emitter saturation

voltage
Emitter output voltage VC = 20 V, IE = –250 µA 17 18 18 V
Turn-off voltage rise time RC = 2 kΩ 0.2 0.2 µs
Turn-on voltage fall time RC = 2 kΩ 0.1 0.1 µs

Maximum duty cycle, each output 45%

p

Input bias current –1 –1 µA

IC = 50 mA 1 2 1 V

Zero duty cycle 1 1
Maximum duty cycle 3.5 3.5

40 V

SG2534, SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX

current limiting section

MIN TYP‡MAX MIN TYP†MAX MIN TYP†MAX

Input voltage

V

I

V

(SENSE)

‡

All typical values, except for temperature coefficients, are at TA = 25°C.

range
(either input)

Sense voltage
at TA = 25°C

Temperature
coefficient of
sense voltage

V

(COMP)

–

≥ 50 mV,

= 2 V

–1

175 200 225 175 200 225 175 200 225 mV

total device

Standby

I

st

current

‡

All typical values, except for temperature coefficients, are at TA = 25°C.

VCC = 40 V, IN–, CURR LIM+, CT, GND, COMP,
EMIT 1, EMIT 2 grounded, IN+ at 2 V,
All other inputs and outputs open

SG2524 SG3524 SG3524Y

to

1

0.2 0.2 0.2 mV/°C

–1

to

1

SG2524, SG3524 SG3524Y

MIN TYP‡MAX MIN TYP‡MAX

8 10 8 mA

V

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5