SGS Thomson Microelectronics SG2524N, SG2524P, SG3524N, SG3524P Datasheet

SG2524



REGULATING PULSE WIDTH MODULATORS

COMPLETE PWM POWER CONTROL CIR­CUITRY

UNCOMMITTED OUTPUTS FOR SINGLE­ENDED OR PUSH PULLAPPLICATIONS

LOW STANDBY CURRENT8mA TYPICAL
OPERATIONUP TO 300KHz
1% MAXIMUM TEMPERATURE VARIATION

OF REFERENCEVOLTAGE

DESCRIPTION

The SG2524, and SG3524 incorporate on a sin­gle monolithic chip all thefunction required for the
construction of regulating power suppies inverters
or switching regulators.They can also be usedas
the control element for high power-outputapplica­tions. The SG3524 family was designed for
switching regulators of either polarity, trans­former-coupled dc-to-dc converters, transformer­less voltage doublers and polarityconverter appli­cations employing fixed-frequency, pulse-width
modulation techniques. The dual alternating out­puts allows either single-ended or push-pull appli-

SG3524

DIP16 SO16

ORDERING NUMBERS: SG2524N (DIP16)

SG3524N (DIP16)
SG2524P (SO16)
SG3524P (SO16)

cations. Each device includes an on-ship refer­ence, error amplifier, programmable oscillator,
pulse-steering flip flop, two uncommitted output
transistors, a high-gain comparator, and current­limiting andshut-down circuitry.

BLOCK DIAGRAM

June 2000

This is advanced information on a new product now in development or undergoingevaluation. Details are subject to change without notice.

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SG2524 - SG3524

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

IN

I

C

I

R

I

T

P

tot

T

stg

T

op

PIN CONNECTION(Top view)

Supply Voltage 40 V
Collector Output Current 100 mA
Reference Output Current 50 mA
Current Through CTTerminal – 5 mA
Total Power Dissipation at T

=70°C 1000 mW

amb

Storage Temperature Range – 65 to 150 °C
Operating Ambient Temperature Range:

SG2524
SG3524

–25to85

0to70

°C

C

°

THERMAL DATA

Symbol Parameter DIP16 SO16 Unit

R

th j-amb

R

th j-alumina

(*) Thermal resistance junction-alumina with the device soldered onthe middle of an alumina supporting substrate measuring 15 x 20mm;

0.65mm thickness with infiniteheatsink.

Thermal Resistance Junction-ambient Max.
Thermal Resistance Junction-alumina (*) Max.

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80

–

50

–

°C/W

C/W

°

SG2524- SG3524

ELECTRICAL CHARACTERISTICS (unless otherwise stated, these specifications apply for Tj = -25 to

+85°C for the SG2524, and0 to70°C for the SG3524,V

= 20V, and f = 20KHz).

IN

Symbol Parameter Test Condition

SG2524 SG3524

Min. Typ. Max. Min. Typ. Max.

REFERENCE SECTION

V

∆V
∆V

Output Voltage 4.8 5 5.2 4.6 5 5.4 V

REF

Line Regulation VIN= 8 to 40V 10 20 10 30 mV

REF

Load Regulation IL= 0 to 20mA 20 50 20 50 mV

REF

Ripple Rejection f = 120Hz, T
Short Circuit Current

=0,Tj=25°C 100 100 mA

V

REF

=25°C66 66dB

j

Limit

∆V

/∆T Temperature Stability Over Operating

REF

0.3 1 0.3 1 %

Temperature range

V

∆

Long Term Stability Tj = 125°C, t = 1000Hrs 20 20 mV

REF

OSCILLATOR SECTION

f

MAX

f/∆T Temperature Stability Over Operating

∆

Maximum Frequency CT= 0.001µF, RT=2KΩ 300 300 KHz
Initial Accuracy R
Voltage Stability V

and CTConstant 5 5 %

T

= 8 to 40V, Tj=25°C1 1%

IN

22%

Temperature Range
Output Amplitude Pin 3, T
Output Pulse Width C

=25°C 3.5 3.5 V

j

= 0.01µF, Tj=25°C 0.5 0.5 µs

T

ERROR AMPLIFIER SECTION

V

G
CMV Common Mode Voltage T
CMR Common Mode Rejection T

V

Input Offset Voltage VCM= 2.5V 0.5 5 2 10 mV

OS

Input Bias Current 2 10 2 10 µA

I

b

Open Loop Voltage Gain 72 80 60 80 dB

V

=25°C 1.8 3.4 1.8 3.4 V

j

=25°C7070dB

j

B Small Signal Bandwidth A

Output Voltage Tj=25°C 0.5 3.8 0.5 3.8 V

O

= 0dB, Tj=25°C 3 3 MHz

V

COMPARATOR SECTION

Duty-cycle % Each Output On 0 45 0 45 %

V

Input Threshold Zero Duty-cycle 1 1 V

IT

Maximum Duty-cycle 3.5 3.5 V

Input Bias Current 1 1 µA

I

b

CURRENT LIMITING SECTION

Sense Voltage Pin 9 = 2V with Error

190 200 210 180 200 220 mV
Amp. Set for Max. Out.
T

=25°C

j

Sense Voltage T.C. 0.2 0.2 mV/°C

CMV Common Mode Voltage –1 1 –1 1

OUTPUT SECTION(each output)

Collector-emitter Voltage 40 40 V
Collector Leackage Curr. V
Saturation Voltage I
Emitter Output Voltage V
Rise Time RC=2KΩ,Tj=25°C 0.2 0.2

t

r

Fall Time RC=2KΩ,Tj=25°C 0.1 0.1 µs

t

f

(*) Total Standby Current VIN= 40V 8 10 8 10 mA

I

q

(*) Excluding oscillator charging current,error and current limit dividers, and with outputs open.

= 40V 0.1 50 0.1 50 µA

CE

= 50mA 1 2 1 2 V

C

= 20V 17 18 17 18 V

IN

Unit

µ

s

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