UC3525ANG4

TEXAS INSTRUMENTS  UC3525ANG4  控制器, PWM, 35V-4.5V电源, 500 kHz, 19V/100mA输出, DIP-16

The is a Regulating Pulse Width Modulator designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip +5.1V reference is trimmed to ±1% and the input common-mode range of the error amplifier includes the reference voltage, eliminating external resistors. A sync input to the oscillator allows multiple units to be slaved or a single unit to be synchronized to an external system clock. A single resistor between the CT and the discharge terminals provides a wide range of dead-time adjustment. These devices also feature built-in soft-start circuitry with only an external timing capacitor required. A shutdown terminal controls both the soft-start circuitry and the output stages, providing instantaneous turn off through the PWM latch with pulsed shutdown, as well as soft-start recycle with longer shutdown commands.

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8 to 35V Operation

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5.1V Reference trimmed to ±1%

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100Hz to 500kHz Oscillator range

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Separate oscillator sync terminal

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Adjustable dead time control

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Internal soft-start

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Pulse-by-pulse shutdown

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Input under-voltage lockout with hysteresis

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Latching PWM to prevent multiple pulses

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Dual source/sink output drivers

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Green product and no Sb/Br

This device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.