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UC3825DWTR

High-speed current-mode PWM, 1MHz, dual totem-pole, push-pull/bridge, SOIC-16

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Manufacturer Part：

UC3825DWTR

Package：

SOIC-16 Wide (10.3 x 7.5 x 2.65 mm)

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Description

Product Overview

The UC3825DWTR from Texas Instruments is a high-speed pulse-width modulation (PWM) controller optimized for push-pull, half-bridge, and full-bridge DC-DC converter topologies in a 16-pin SOIC package. With 50ns output rise/fall time, 1MHz switching capability, and current-mode control, it targets high-power high-efficiency power conversion.

Key Specifications

Topology Current-Mode PWM Controller
Max Switching Frequency 1 MHz
Output Configuration Dual totem-pole (push-pull)
Max Duty Cycle 50% (typ)
Output Rise/Fall Time 50 ns
Reference Voltage 5.1V (+/-1%)
Supply Voltage 8.4V to 30V (start: 12.5V)
Undervoltage Lockout 8.4V start, 7.6V stop
Soft Start Yes (external capacitor)
Operating Temperature -40 to +85 C (DW suffix)
Package SOIC-16 (Wide)

Features

  • Current-mode control for improved line regulation and inherent current limiting
  • Dual totem-pole outputs for push-pull/bridge topologies
  • 50ns fast output rise/fall time
  • 1MHz maximum switching frequency
  • 5.1V +/-1% precision reference
  • UVLO with hysteresis (12.5V start, 8.4V operating)
  • Soft start with external capacitor
  • Full-cycle overcurrent protection with latched shutdown
  • Pulse-by-pulse current limiting
  • Synchronizable oscillator

Applications

  • Push-pull and bridge DC-DC converters
  • Off-line switching power supplies
  • Battery charger converters
  • High-power motor drive power supplies

The UC3825DWTR from Texas Instruments is a high-speed pulse-width modulation (PWM) controller with current-mode control in a 16-pin wide-body SOIC package. The DW suffix denotes SOIC-16W package, TR indicates tape and reel. Designed for push-pull, half-bridge, and full-bridge DC-DC converter topologies, it features dual totem-pole outputs capable of 50ns rise/fall times at 1MHz switching frequency. Current-mode control provides improved line transient response, inherent pulse-by-pulse current limiting, and simpler loop compensation compared to voltage-mode control. The 50% maximum duty cycle (due to the push-pull output configuration) makes it unsuitable for single-ended forward or flyback topologies (use UC3842 for those). The built-in 5.1V +/-1% reference, UVLO with hysteresis, soft start, and latched overcurrent shutdown provide a complete power supply control solution.

The UC3825 operates through five subsystems: (1) Current-Mode Control Loop: The switch current is sensed through an external resistor and compared against the output of the voltage error amplifier. When the current sense voltage exceeds the error amplifier output, the PWM comparator terminates the on-pulse. This creates an inner current loop that responds within one switching cycle to input voltage changes, eliminating the need for input voltage feedforward. (2) Dual Totem-Pole Outputs: Two identical outputs (OUTA, OUTB) alternate on successive clock cycles, each driving at up to 50% duty cycle. The totem-pole output stage can source and sink 500mA peak, directly driving power MOSFET gates through a small series resistor. (3) Oscillator: An internal oscillator sets the switching frequency using a single external timing resistor (RT) and capacitor (CT). The oscillator frequency is twice the output frequency (each output switches at half the oscillator frequency). The oscillator can be synchronized to an external clock. (4) Protection: UVLO holds the outputs low until VCC exceeds 12.5V (start) and shuts down when VCC drops below 8.4V (stop). Soft start gradually increases the duty cycle from zero using an external capacitor on the SS pin. A cycle-by-cycle current limit comparator terminates the pulse when the current sense exceeds a threshold. A latched shutdown comparator provides protection against catastrophic overcurrent events. (5) Error Amplifier: A high-gain transconductance error amplifier with access to both inverting and non-inverting inputs and the output (COMP pin) allows flexible compensation network design.

Pin Name Type Description
1 INV Input Error amplifier inverting input
2 NI Input Error amplifier non-inverting input
3 E/A OUT Output Error amplifier output / compensation
4 CLOCK I/O Oscillator sync input/output
5 RT Input Oscillator timing resistor
6 CT Input Oscillator timing capacitor
7 VCC Power Supply voltage (8.4-30V)
8 OUTA Output Output A (totem-pole)
9 GND Power Ground
10 OUTB Output Output B (totem-pole)
11 VC Power Output stage supply
12 SS I/O Soft start capacitor
13 ISET Input Current limit set / current sense
14 ISH Input Current sense input
15 SHUTDOWN Input Latched shutdown input
16 VREF Output 5.1V reference output
  • Push-pull DC-DC converter at 200kHz with 50ns fast output driving power MOSFET gates directly
  • Half-bridge telecom rectifier with current-mode control providing inherent input voltage feedforward
  • Off-line 500W power supply with latched overcurrent shutdown and UVLO protection
  • Battery-powered converter with soft start limiting inrush current during power-up
Model Manufacturer Topology Frequency Notes
UC3846DWTR TI Current-mode 500kHz Higher current limit threshold
UC3825BDWTR TI Current-mode 1MHz Improved version
LM5030MM/NOPB TI Current-mode 2MHz Higher frequency, push-pull
UC3843AD8TR TI Current-mode 500kHz Single-ended (flyback/forward)
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