UC1525A

ACTIVE

Regulating Pulse Width Modulators

Product details

Vin (max) (V) 35 Operating temperature range (°C) -55 to 125 Control mode Voltage Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Military Features Error amplifier, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 49
Vin (max) (V) 35 Operating temperature range (°C) -55 to 125 Control mode Voltage Topology Boost, Flyback, Forward, Full bridge, Half bridge, Push pull Rating Military Features Error amplifier, Multi-topology, Soft start, Synchronization pin Duty cycle (max) (%) 49
CDIP (J) 16 135.3552 mm² 19.56 x 6.92 LCCC (FK) 20 79.0321 mm² 8.89 x 8.89
  • 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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Technical documentation

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Type Title Date
* Data sheet UCx52xA Regulating Pulse Width Modulators datasheet (Rev. D) PDF | HTML 27 Jul 2017
* SMD UC1525A SMD 5962-89511 21 Jun 2016
Technical article When should you use PWM controllers? PDF | HTML 02 Dec 2016
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999

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Package Pins CAD symbols, footprints & 3D models
CDIP (J) 16 Ultra Librarian
LCCC (FK) 20 Ultra Librarian

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