SG1825 Datasheet | Microsemi

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, micropower start-up circuitry, softstart, high-frequency oscillator, wideband error amplifier, fast currentlimit parator, full double-pulse suppression logic, and dual totempole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation delays through the current limit parator, logic, and output drivers. This device can be used to implement either currentmode or voltage-mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55°C to 125°C. The SG2825C is characterized for the industrial range of -25°C to 85°C, and the SG3825C is selected for the mercial range of 0°C to 70°C. K E Y F E AT U R E S s IMPROVED REFERENCE INITIAL TOLERANCE (±1% max.) s IMPROVED OSCILLATOR INITIAL ACCURACY (±3% typ.) s IMPROVED STARTUP CURRENT (500µA typ.) s PROP DELAY TO OUTPUTS (50ns typ.) p 10V TO 30V OPERATION p 5.1V REFERENCE TRIMMED TO ±1% p 2MHZ OSCILLATOR CAPABILITY p 1.5A PEAK TOTEM-POLE DRIVERS p U.V. LOCKOUT WITH HYSTERESIS p NO OUTPUT DRIVER "FLOAT" p PROGRAMMABLE SOFTSTART p DOUBLE-PULSE SUPPRESSION LOGIC p WIDEBAND LOW-IMPEDANCE ERROR AMPLIFIER p CURRENT-MODE OR VOLTAGE-MODE CONTROL p WIDE CHOICE OF HIGH-FREQUENCY PACKAGES PRODUCT HIGHLIGHT I N I T I A L O S C I L L AT O R A C C U R A C Y Percentage of Units - % Sample Size = 45 279 Mean 401.661 411.887 Std. Dev. = 3.8 4.3 HIGH RELIABILITY FEATURES s AVAILABLE TO MIL-STD-883B s LINFINITY LEVEL "S" PROCESSING AVAIL. 0 390 395 400 405 410 415 Initial Oscillator Accuracy - KHz PACKAGE ORDER INFORMATION TJ (°C) 0 to 70 -25 to 85 -55 to 125 MIL-STD-883 DESC Plastic DIP 16-pin SG3825CN SG2825CN — — — Wide SOIC Q Plastic LCC...