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SG1524J

REGULATING PULSE WIDTH MODULATOR

Microsemi Corporation 

SG1524/SG2524/SG3524

ELECTRICAL CHARACTERISTICS (continued)

Parameter

Oscillator Section (Note 4)

Initial Accuracy

Voltage Stability

Maximum Frequency

Sawtooth Peak Voltage

Sawtooth Valley Voltage

Clock Amplitude

Clock Pulse Width

Test Conditions

TJ = 25°C

MIN ≤ TJ ≤ MAX

V = 8V to 40V

IN

RT = 2KΩ, CT = 1nF

VIN = 40V

V = 8V

IN

SG1524/2524

SG3524

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

Units

36 40 44 36 40 44 KHz

34

46 34

46 KHz

0.1 1

0.1 1 %

200 400

200 400

KHz

3

3.8 3

3.8 V

0.6 1 1.2 0.6 1 1.2 V

3.2

3.2

V

0.3

1.5 0.3

1.5 µs

Error Amplifier Section (Note 5)

Input Offset Voltage

Input Bias Current

RS ≤ 2KΩ

Input Offset Current

DC Open Loop Gain

Output Low Level

Output High Level

Common Mode Rejection

Supply Voltage Rejection

Gain-Bandwidth Product (Note 7)

P.W.M. Comparator (Note 4)

RL ≥10MΩ, TJ = 25°C

VPIN 1 - VPIN 2 ≥ 150mV

VPIN 2 - VPIN 1 ≥150mV

VCM = 1.8V to 3.4V

VIN = 8V to 40V

TJ = 25°C

Minimum Duty Cycle

Maximum Duty Cycle

VCOMP = 0.5V

VCOMP = 3.6V

Current Limit Amplifier Section (Note 6)

Sense Voltage

Input Bias Current

TJ = 25°C

Shutdown Section

Threshold Voltage

T

J

=

25°C

MIN ≤ TJ ≤ MAX

Output Section (each transistor)

Collector Leakage Current

Collector Saturation Voltage

Emitter Output Voltage

Collector Voltage Rise Time

Collector Voltage Fall Time

Power Consumption

VCE = 40V

IC = 50mA

IE = 50mA

RC = 2KΩ

RC = 2KΩ

Standby Current

VIN = 40V

0.5 5

2 10 mV

1 10

1 10 µA

1

2 µA

72

60

dB

0.2 0.5

0.2 0.5 V

3.8 4.2

3.8 4.2

V

70

dB

55

dB

12

12

MHz

0

0%

45 49

45 49

%

190 200 210 180 200 220 mV

200

200 µA

0.5 0.8 1.2 0.5 0.8 1.2 V

0.2

1.8 0.2

1.8 V

50

50 µA

2

2V

17

17

V

0.4

0.4 µs

0.2

0.2 µs

7 10

7 10 mA

Note 4. FOSC = 40KHz (RT = 2.9KΩ, CT = .01µF)

Note 5. VCM = 2.5V

Note 6. VCM = 0V

Note 7. These parameters, although guaranteed over the recommended operating conditions, are not 100% tested in production.

4/90 Rev 1.1 2/94

Copyright © 1994

LINFINITY Microelectronics Inc.

3

11861 Western Avenue ∞ Garden Grove, CA 92841

(714) 898-8121 ∞ FAX: (714) 893-2570

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