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UCC2895PW

BiCMOS Phase-Shift PWM Controller, 1MHz, TSSOP-20, -40°C to 85°C

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Manufacturer Part：

UCC2895PW

Package：

TSSOP-20 (6.5 x 6.4 x 1.0 mm)

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Description

Product Overview

The UCC2895PW from Texas Instruments is a BiCMOS advanced phase-shift PWM controller designed for phase-shifted full-bridge power converter applications. It operates with switching frequencies up to 1 MHz and supports voltage-mode, peak current-mode, or average current-mode control. The device is housed in a 20-pin TSSOP package and features programmable output turn-on delay, adaptive delay set, and 0% to 100% duty-cycle control.

Key Specifications

Topology Phase-Shifted Full Bridge
Control Mode Current, Feedforward, Voltage
Switching Frequency Up to 1 MHz
Max Duty Cycle 100%
Supply Voltage 10 V to 16.5 V
UVLO Threshold (On/Off) 11 V / 9 V
Error Amp Bandwidth 7 MHz
Operating Current 5 mA typical at 500 kHz
Start-up Current 150 µA
Package TSSOP-20 (6.5 x 6.4 mm)
Operating Temperature -40°C to 85°C

Features

  • Programmable output turn-on delay for ZVS operation
  • Adaptive delay set for optimized switching
  • Bidirectional oscillator synchronization
  • Voltage-mode, peak current-mode, or average current-mode control
  • Programmable soft start, soft stop, and chip disable via single pin
  • 0% to 100% duty-cycle control
  • 7-MHz error amplifier for fast transient response
  • Very low 150 µA start-up current during UVLO
  • Four 100 mA complementary MOS output drivers

Applications

  • Phase-shifted full-bridge DC-DC converters
  • Server and telecom power supplies
  • Industrial power systems
  • High-density power architectures
  • Battery charger and renewable energy systems

The UCC2895PW is a BiCMOS advanced phase-shift PWM controller from Texas Instruments that implements control of a full-bridge power stage by phase shifting the switching of one half-bridge relative to the other. The device allows constant-frequency pulse-width modulation in conjunction with resonant zero-voltage switching (ZVS) to provide high efficiency at high frequencies. It can operate as either a voltage-mode or current-mode controller and maintains functionality of the UC3875/6/7/8 family while adding enhanced control logic, adaptive delay set, and shutdown capability. Built using BCDMOS process, it operates with dramatically less supply current than bipolar alternatives.

The UCC2895PW operates by generating four output signals (OUTA, OUTB, OUTC, OUTD) that drive the two half-bridges of a full-bridge power stage. The phase relationship between the two half-bridge pairs is modulated to control power delivery. An internal oscillator sets the switching frequency (up to 1 MHz) using external RT and CT components. The error amplifier (7 MHz GBW) compares the output voltage feedback to the reference and generates a control voltage. The PWM comparator modulates the phase shift between the two bridge legs. Programmable delay between complementary outputs enables zero-voltage switching by allowing resonant transitions. The adaptive delay set (ADS) feature varies delay times based on load current for optimized ZVS performance. Current-mode or voltage-mode control is selectable via the RAMP pin configuration.

Pin Name Type Function
1 DELAB Output Delay set for A-B leg
2 DELCD Output Delay set for C-D leg
3 ADS Input Adaptive delay set
4 EA+ Input Error amplifier non-inverting input
5 EA- Input Error amplifier inverting input
6 COMP Output Error amplifier output
7 SS/DISB I/O Soft start / disable
8 RT Output Oscillator timing resistor
9 CT I/O Oscillator timing capacitor
10 SYNC I/O Oscillator synchronization
11 RAMP Input PWM comparator inverting input
12 CS Input Current sense input
13 REF Output 5V reference (1.2%)
14 OUTA Output Output driver A
15 OUTB Output Output driver B
16 PGND Ground Output stage ground
17 OUTC Output Output driver C
18 OUTD Output Output driver D
19 VDD Power Supply voltage
20 GND Ground Chip ground
  • Phase-shifted full-bridge DC-DC converters for telecom and server power
  • High-efficiency server and datacom power supplies
  • Industrial power systems requiring ZVS operation
  • Electric vehicle on-board chargers
  • Solar inverter and renewable energy power stages
Manufacturer Part Number Package Notes
Texas Instruments UCC3895PW TSSOP-20 0°C to 70°C version
Texas Instruments UCC28950PW TSSOP-24 Enhanced with synchronous rectification
Texas Instruments UCC28951PW TSSOP-24 Improved version of UCC28950
Infineon ICE2HS01G DSO-14 Half-bridge LLC controller alternative
STMicroelectronics L6612 SO-16 Full-bridge PWM controller
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