SG1825C 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, micro power start-up circuitry, soft start, highfrequency oscillator, wideband error amplifier, fast current limit parator, 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 parator, logic, and output drivers. This device can be used to implement either current mode or voltagemode 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. IMPORTANT: For the most current data, consult MICROSEMI’s website: http://.microsemi. PRODUCT HIGHLIGHT INITIAL OSCILLATOR ACCURACY Sample Size = 279 Mean 401.661 Std. Dev. = 3.8 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 Percentage of Units - % KEY...