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.