SG2524, SG3524

REGULATING PULSEWIDTH MODULATORS

SLVS077D – APRIL 1977 – REVISED FEBRUARY 2003

2

POST OFFICE BOX 655303

functional block diagram

T

COL 2

OSC OUT

EMIT 2

EMIT 1

COL 1

Vref

Reference

Regulator

Comparator

Oscillator

SHUTDOWN

Error Amplifier

1

2

9

4

5

CURR LIM–

CURR LIM+

GND

8

10

+

–

NOTE A: Resistor values shown are nominal.

12

11

13

14

3

IN–

IN+

COMP

1 k

Ω

10 k

Ω

15

RT

CT

REF OUT

16

6

7

Vref

Vref

Vref

Vref

VCC

Vref

40 V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

100 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

50 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current through CT terminal

–5 mA

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

150

°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance,

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

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–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), 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 51-7.