Product details

Topology Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Duty cycle (Max) (%) 49 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 7.0/6.5 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 0.4
Topology Boost, Buck, Flyback, Forward, Full-Bridge, Half-Bridge, Push-Pull Duty cycle (Max) (%) 49 Supply voltage (Max) (V) 40 UVLO thresholds on/off (V) 7.0/6.5 Features Adjustable Switching Frequency, Current Limiting, Dead Time Control, Error Amplifier, Multi-topology, Soft Start, Synchronization Pin Operating temperature range (C) 0 to 70 Rating Catalog Frequency (Max) (kHz) 500 Gate drive (Typ) (A) 0.4
PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 10.3 x 7.5
  • 8-V to 35-V Operation
  • 5.1-V Reference Trimmed to 1%
  • 100-Hz to 500-kHz Oscillator Range
  • Separate Oscillator Sync Terminal
  • Adjustable Dead-Time Control
  • Internal Soft Start
  • Pulse-by-Pulse Shutdown
  • Input Undervoltage Lockout With Hysteresis
  • Latching PWM to Prevent Multiple Pulses
  • Dual Source and Sink Output Drivers
  • 8-V to 35-V Operation
  • 5.1-V Reference Trimmed to 1%
  • 100-Hz to 500-kHz Oscillator Range
  • Separate Oscillator Sync Terminal
  • Adjustable Dead-Time Control
  • Internal Soft Start
  • Pulse-by-Pulse Shutdown
  • Input Undervoltage Lockout With Hysteresis
  • Latching PWM to Prevent Multiple Pulses
  • Dual Source and Sink Output Drivers

The UC1525A/1527A 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.

The UC1525A/1527A 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.

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Type Title Date
* Data sheet UCx52xA Regulating Pulse Width Modulators datasheet (Rev. D) 27 Jul 2017
Technical article When should you use PWM controllers? 02 Dec 2016
Technical article Before digital control, there were general-purpose PWMs 19 Oct 2016
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999
Application note Understanding Buck Power Stages In Switchmode Power Supplies 04 Mar 1999

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PDIP (N) 16 View options
SOIC (DW) 16 View options

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