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

					SG2524, SG3524
	REGULATING PULSE-WIDTH MODULATORS
	SLVS077B ± APRIL 1977 ± REVISED JULY 1999
D Complete PWM Power Control Circuitry	D OR N PACKAGE
D Uncommitted Outputs for Single-Ended or			(TOP VIEW)
Push-Pull Applications	IN ±					REF OUT
D Low Standby Current . . . 8 mA Typ			1	16
D Interchangeable With Silicon General	IN +		2	15		VCC
SG2524 and SG3524	OSC OUT		3	14		EMIT 2
	CURR LIM+		4	13		COL 2
description	CURR LIM±		5	12		COL 1
The SG2524 and SG3524 incorporate all the	RT		6	11		EMIT 1
	CT		7	10		SHUTDOWN
functions required in the construction of a	GND		8	9		COMP
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

		INPUT	PACKAGED DEVICES		CHIP FORM
	TA	REGULATION	SMALL OUTLINE	PLASTIC DIP
					(Y)
		MAX (MV)	(D)	(N)
	0°C to 70°C	30	SG3524D	SG3524N	SG3524Y
	± 25°C to 85°C	20	SG2524D	SG2524N	Ð

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

15	Reference	16
VCC	Regulator	REF OUT
		Vref

RT 6

CT 7

IN ± 1

2

IN+

COMP 9

CURR LIM + 4

5

CURR LIM ±

10

SHUTDOWN

8

GND

		Vref	12	COL 1
			11	EMIT 1
		T	13
	Vref			COL 2
			14	EMIT 2
	Oscillator		3
				OSC OUT
Vref		Vref
±
+			Comparator

Error Amplifier

Vref

+

±

1 kΩ

10 kΩ

NOTE A: Resistor values shown are nominal.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²

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, θJA (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

²Stresses beyond those listed under ªabsolute maximum ratingsº 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 ªrecommended operating conditionsº 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), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) ± TA)/θJA. 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		SG3524		UNIT
	MIN	MAX	MIN	MAX
Supply voltage, VCC	8	40	8	40	V
Reference output current	0	50	0	50	mA
Current through CT terminal	± 0.03	± 2	± 0.03	± 2	mA
Timing resistor, RT	1.8	100	1.8	100	kΩ
Timing capacitor, CT	0.001	0.1	0.001	0.1	µF
Operating free-air temperature	± 25	85	0	70	°C

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

reference section

	PARAMETER	TEST CONDITIONS²		SG2524			SG3524		SG3524Y		UNIT
			MIN	TYP³	MAX	MIN	TYP³	MAX	MIN TYP³	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	TA = MIN to MAX		0.3%	1%		0.3%	1%
	with temperature
	Short-circuit output	Vref = 0		100			100		100		mA
	current§

² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ³ 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:

N

(xn * X)2

n+1

s + N * 1

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

3

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)

oscillator section

PARAMETER

TEST CONDITIONS²

SG2524, SG3524

SG3524Y

UNIT

MIN

TYP³

MAX

MIN

TYP³

MAX

fosc

Oscillator frequency

CT = 0.001 µF,

RT = 2 kΩ

450

450

kHz

Standard deviation of

All values of voltage, temperature,

5%

5%

frequency§

resistance, and capacitance constant

Frequency change with

VCC = 8 V to 40 V,

TA = 25°C

1%

1%

voltage

fosc

Frequency change with

TA = MIN to MAX

2%

temperature

Output amplitude at OSC

TA = 25°C

3.5

3.5

V

OUT

tw

Output pulse duration

CT = 0.01 µF,

TA = 25°C

0.5

0.5

µs

(width) at OSC OUT

² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

³ All typical values, except for temperature coefficients, are at T

= 25°C

A

§ Standard deviation is a measure of the statistical distribution about the mean as derived from the formula:

N

(xn *

X)2

s +

n+1

N * 1

error amplifier section

PARAMETER

TEST

SG2524

SG3524

SG3524Y

UNIT

CONDITIONS²

MIN

TYP³

MAX

MIN

TYP³

MAX

MIN

TYP³

MAX

VIO

Input offset voltage

VIC = 2.5 V

0.5

5

2

10

2

mV

IIB

Input bias current

VIC = 2.5 V

2

10

2

10

2

µA

Open-loop voltage

72

80

60

80

80

dB

amplification

VICR

Common-mode input

TA = 25°C

1.8 to

1.8 to

V

voltage range

3.4

3.4

CMMR

Common-mode rejection

70

70

70

dB

ratio

B1

Unity-gain bandwidth

3

3

3

MHz

Output swing

TA = 25°C

0.5

3.8

0.5

3.8

0.5

3.8

V

² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

³ All typical values, except for temperature coefficients, are at T

= 25°C

A

4	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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

	PARAMETER	TEST CONDITIONS²		SG2534, SG3524			SG3524Y		UNIT
				MIN	TYP³	MAX	MIN TYP³	MAX
V(BR)CE	Collector-emitter breakdown			40					V
	voltage
	Collector off-state current	VCE = 40 V			0.01	50	0.01		µA
Vsat	Collector-emitter saturation	IC = 50 mA			1	2	1		V
	voltage
VO	Emitter output voltage	VC = 20 V,	IE = ± 250 µA	17	18		18		V
tr	Turn-off voltage rise time	RC = 2 kΩ			0.2		0.2		µs
tf	Turn-on voltage fall time	RC = 2 kΩ			0.1		0.1		µs
² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
³ All typical values, except for temperature coefficients, are at T			= 25°C.
		A

comparator section

	PARAMETER	TEST CONDITIONS²	SG2534, SG3524	SG3524Y		UNIT
			MIN TYP³ MAX	MIN TYP³	MAX
	Maximum duty cycle, each output		45%
VIT	Input threshold voltage at COMP	Zero duty cycle	1	1		V
		Maximum duty cycle	3.5	3.5
IIB	Input bias current		± 1	± 1		µA

² For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. ³ All typical values, except for temperature coefficients, are at TA = 25°C.

current limiting section

PARAMETER

TEST CONDITIONS

SG2524

SG3524

SG3524Y

UNIT

MIN

TYP³

MAX

MIN

TYP²

MAX

MIN

TYP²

MAX

Input voltage

± 1

± 1

VI

range

to

to

V

(either input)

1

1

V(SENSE)

Sense voltage

175

200

225

175

200

225

175

200

225

mV

at TA = 25°C

V

± V

≥ 50 mV,

Temperature

(IN +)

(IN ±)

V(COMP) = 2 V

coefficient of

0.2

0.2

0.2

mV/°C

sense voltage

³ All typical values, except for temperature coefficients, are at T = 25°C.

A

total device

	PARAMETER	TEST CONDITIONS	SG2524, SG3524			SG3524Y		UNIT
			MIN	TYP³	MAX	MIN TYP³	MAX
	Standby	VCC = 40 V, IN ±, CURR LIM +, CT, GND, COMP,
Ist		EMIT 1, EMIT 2 grounded, IN + at 2 V,		8	10	8		mA
	current
		All other inputs and outputs open

³ All typical values, except for temperature coefficients, are at TA = 25°C.

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