DESCRIPTION

The SG1825C is a high-performance pulse width modulator optimized for high frequency

current-mode power supplies. Included in the controller are a precision voltage reference,

micro power start-up circuitry, soft start, high frequency oscillator, wideband error amplifier,

fast current limit comparator, full double-pulse suppression logic, and dual totem pole output

drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation delays through the current limit comparator, logic, and output drivers.

KEY FEATURES

IMPROVED REFERENCE INITIAL TOLERANCE (±1% max.)

IMPROVED OSCILLATOR INITIAL ACCURACY (±3% typ.)

IMPROVED STARTUP CURRENT (500µA typ.)

PROP DELAY TO OUTPUTS(50ns typ.)

10V TO 30V OPERATION

5.1V REFERENCE TRIMMED TO ±1%

2MHZ OSCILLATOR CAPABILITY

1.5A PEAK TOTEM-POLE DRIVERS

U.V. LOCKOUT WITH HYSTERESIS

NO OUTPUT DRIVER FLOAT

PROGRAMMABLE SOFTSTART

DOUBLE-PULSE SUPPRESSION LOGIC

WIDEBAND LOW-IMPEDANCE ERROR AMPLIFIER

CURRENT-MODE OR VOLTAGE-MODE CONTROL

WIDE CHOICE OF HIGH FREQUENCY PACKAGES

KEY FEATURES

AVAILABLE TO MIL-STD-883B

MICROSEMI LEVEL S PROCESSING AVAIL.