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sg1524b-2| Datasheet

By datasheet - February 15th, 2009

sg1524b-2| Datasheet

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SG1524B/SG2524B/SG3524B

REGULATING PULSE WIDTH MODULATOR
DESCRIPTION
The SG1524B is a pulse width modulator for switching power supplies which features improved performance over industry standards like the SG1524. A direct pin-for-pin replacement for the earlier device, it combines advanced processing techniques and circuit design to provide improved reference accuracy, and extended common mode range at the error amplifier and current limit inputs. A DC-coupled flip-flop eliminates triggering and glitch problems, and a PWM data latch prevents edge oscillations. The circuit incorporates true digital shutdown for high speed response, while an undervoltage lockout circuit prevents spurious outputs when the supply voltage is too low for stable operation. Full double-pulse suppression logic insures alternating output pulses when the Shutdown pin is used for pulse-by-pulse current limiting. The SG1524B is specified for operation over the full military ambient temperature range of -55 C to 125 C. The SG2524B is characterized for the industrial range of -25 C to 85 C, and the SG3524B
is designed for the commercial range of 0 C to 70 C.

FEATURES
7V to 40V operation 5V reference trimmed to 1% 100Hz to 400KHz oscillator range Excellent external sync capability Dual 100mA output transistors Wide current limit common mode range DC-coupled toggle flip-flop PWM data latch Undervoltage lockout Full double-pulse suppression logic 60V output collectors

HIGH RELIABILITY FEATURES - SG1524B
Available to MIL-STD-883 and DESC SMD Scheduled for MIL-M-38510 QPL listing Radiation data available LMI level "S" processing available

DESCRIPTION
VREF

+VIN GROUND

Reference Regulator

Undervoltage Lockout OSC

To Internal Circuitry RT CT Oscillator

COLLECTOR A

S T R INVERTING Error NON-INVERTING +VIN +C.L. SENSE C.L. -C.L. SENSE P.W.M. D Q PWM LATCH S Q Q

Q Q TOGGLE F/F

EMITTER A

COLLECTOR B

MEMORY F/F

EMITTER B

COMPENSATION

SHUTDOWN

Rev 1.3a 3.21.2005
Copyright 2000

1

11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570

Microsemi Inc.


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