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SG1825C

Current Mode PWMs Isolated Switching Regulators - Current Mode PWM, 1.5Mhz

Status: In Production

Features:

  • Improved Reference Initial Tolerance (±1% max.)
  • Improved Oscillator Initial Accuracy (±3% typ.)
  • Improved Startup Current (500µA typ.)- Propagation Delay to Outputs (50ns typ.)
  • 10V to 30V Operation
  • 5.1V Reference Trimmed to ±1%
  • 2MHz Oscillator Capability
  • 1.5A Peak Totem-Pole Drivers
  • U.V. Lockout with Hysteresis
  • No Output Driver “FLOAT”
  • Programmable Softstart
  • Double-Pulse Suppression Logic
  • Wideband Low-Impedance Error Amplifier
  • Current-Mode or Voltage-Mode Control
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Device Overview

Summary

The SG1825C is a high-performance pulse width modulator optimized for high frequency current-mode power supplies. Included in the controller are a precision voltage reference, micro power start-up circuitry, soft-start, high frequency oscillator, wideband error amplifier, fast current limit comparator, full double-pulse suppression logic, and dual totem pole output drivers. Innovative circuit design and an advanced linear Schottky process result in very short propagation
delays through the current limit comparator, logic, and output drivers. This device can be used to implement either current mode or voltage mode switching power supplies. It also is useful as a series-resonant controller to frequencies beyond 1MHz. The SG1825C is specified for operation over the full military ambient temperature range of -55°C to 125°C.

Additional Features
    • Improved Reference Initial Tolerance (±1% max.)
    • Improved Oscillator Initial Accuracy (±3% typ.)
    • Improved Startup Current (500µA typ.)- Propagation Delay to Outputs (50ns typ.)
    • 10V to 30V Operation
    • 5.1V Reference Trimmed to ±1%
    • 2MHz Oscillator Capability
    • 1.5A Peak Totem-Pole Drivers
    • U.V. Lockout with Hysteresis
    • No Output Driver “FLOAT”
    • Programmable Softstart
    • Double-Pulse Suppression Logic
    • Wideband Low-Impedance Error Amplifier
    • Current-Mode or Voltage-Mode Control
Parametrics
Name
Value
Regulator Type
HI Rel Switching Regulators
Configuration
Current Mode PWMs
Supported Topology
Push-pull, Single ended
Supported Output
2
Minimum Input Voltage (V)
10
Maximum Input Voltage (V)
30
Output Current (mA) Max
500
Maximum Frequency (kHz)
1500
Operating Temperature Range (°C)
-55 to 125
Vref (V)
5.1
Duty Cycle Max (%)
85
UVLO
Yes
Current Limit
Yes

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