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SG1525AF

Voltage Mode PWMs Dual Sink/Source Outputs - 100Hz to 500KHz oscillator range

Status: In Production

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Device Overview

Summary

The SG1525A/1527A series of pulse width modulator integrated circuit s are designed to offer improved performance and lower external parts count when used to implement all types of switching power supplies. The  on-chip +5.1 V reference is trimmed to ±1% initial accuracy and the input common-mode range of the error amplifier includes the reference voltage, eliminating external potentiometers and  divider resistors. A Sync input to the oscillator allows multiple units to be slaved together, or a single unit to be synchronized to an external system clock. A single resistor between the CT pin and the D is charge pin provides a wide range of deadtime adjustment. These devices also feature built-in soft-start circuitry with only a timing capacitor required externally. A Shutdown pin controls both the soft -start circuitry and the output stages, providing instantaneous turn-off with soft-start recycle for slow turn-on. These functions are also controlled by an under voltage lockout which keeps the outputs o ff and the soft-start capacitor discharged for input voltages less than that required for normal operation. Another unique feature of these PWM circuits is a latch following the comparator. Once a  PWM pulse has been terminated for any reason, the outputs remain off for the duration of the period. The latch is reset with each clock pulse. The output stages are totem-pole designs capable of sourcing or sinking in excess of 200mA. The SG1525A output stage features NOR logic, giving a LOW output for an OFF  state. The SG1527A utilizes OR logic, which results in a HIGH output level when OFF

Additional Features
  • 8V to 35V Operation
  • 5.1V Reference Trimmed to ±1%
  • 100Hz to 500kHz Oscillator Range
  • Separate Oscillator Sync Terminal
  • Adjustable Deadtime Control
  • Internal Soft-start
  • Input Undervoltage Lockout
  • Latching P.W.M. to Prevent Multiple Pulses
  • Dual Source/Sink Output Drivers
Parametrics
Name
Value
Regulator Type
HI Rel Switching Regulators
Configuration
Voltage Mode PWMs
Supported Topology
Push-pull, Single ended
Supported Output
2
Minimum Input Voltage (V)
8
Maximum Input Voltage (V)
35
Output Current (mA) Max
100
Maximum Frequency (kHz)
350
Operating Temperature Range (°C)
-55 to 125
Vref (V)
5.1
Duty Cycle Max (%)
49
Operating Temp Range
to
Quiescent Current (mA) typ
14

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