COS3525ADW

The COS3525A/3527A series of pulse width modulator integrated circuits are designed to offer improved performance and lowered external parts count when used in designing all types of switching power supplies. The on-chip 5.1-V 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 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.

Applications

• Solar Inverters
• Welding Inverters
• Motor Control
• Battery Chargers
• DC/DC Power Supplies
• Converters Using Voltage Mode

Key features

• 8-V to 40-V Operation
• Low Standby Current: 5.0 mA
• 5.1-V Reference Trimmed to 1%
• 100-Hz to 500kHz Oscillator Range
• Separate Oscillator Sync Terminal
• Adjustable Dead-Time Control
• Internal Soft Start
• Pulse-by-Pulse Shutdown Input Under-voltage Lockout With Hysteresis
• Latching PWM to Prevent Multiple Pulses
• Dual Source and Sink Output Drivers
• Available Packaging: SOP16/WSOP16/TSSOP16/DIP16