Overview
The UC2875DWPTR is a bipolar phase-shifted full bridge controller manufactured by Texas Instruments. This integrated circuit is designed to control a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other, enabling constant frequency pulse-width modulation combined with resonant, zero-voltage switching for high efficiency performance at high frequencies. The device can be configured for either voltage or current mode operation and includes a separate over-current shutdown for fast fault protection.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 28-pin SOIC (DW) |
| Operating Temperature Range | -25°C to 85°C |
| Supply Voltage (Vcc/Vdd) | 9.5 V to 20 V |
| Startup Voltage | 10.75V with 1.5V hysteresis |
| Duty Cycle | 0 to 100% |
| Switching Frequency | Up to 1MHz |
| Output Type | Four 2A Totem Pole Outputs |
| Fault Protection | Current Limiting with Over-Current Comparator |
| Control Features | Frequency Control, Soft Start, Sync |
Key Features
- Zero to 100% Duty Cycle Control
- Programmable Output Turn-On Delay
- Compatible with Voltage or Current Mode Topologies
- Practical Operation at Switching Frequencies to 1MHz
- Four 2A Totem Pole Outputs
- 10MHz Error Amplifier
- Undervoltage Lockout (UVLO) with 10.75V threshold and 1.5V hysteresis
- Low Startup Current (150µA)
- Outputs Active Low During UVLO
- Soft-Start Control
- Latched Over-Current Comparator With Full Cycle Restart
- Trimmed Reference and Flexible Ramp Generation and Slope Compensation Circuitry
Applications
The UC2875DWPTR is suitable for various high-efficiency power conversion applications, including:
- Resonant and zero-voltage switching power supplies
- High-frequency DC-DC converters
- Full-bridge power stages in both voltage and current mode operations
- Applications requiring high efficiency and reliable fault protection
Q & A
- What is the operating temperature range of the UC2875DWPTR?
The operating temperature range is -25°C to 85°C.
- What is the startup voltage for the UC2875DWPTR?
The startup voltage is 10.75V with 1.5V hysteresis.
- What is the maximum switching frequency of the UC2875DWPTR?
The maximum switching frequency is up to 1MHz.
- Does the UC2875DWPTR support both voltage and current mode operations?
Yes, it supports both voltage and current mode topologies.
- What type of fault protection does the UC2875DWPTR have?
The device has current limiting with an over-current comparator and full-cycle restart operation.
- What is the package type of the UC2875DWPTR?
The package type is 28-pin SOIC (DW).
- Can the UC2875DWPTR be synchronized with an external clock?
Yes, it can be synchronized with an external clock using the CLOCKSYNC pin.
- What is the purpose of the programmable output turn-on delay in the UC2875DWPTR?
The programmable output turn-on delay allows for the insertion of a dead-time at the turn-on of each output stage, enabling resonant switching action.
- Does the UC2875DWPTR have soft-start control?
Yes, it includes soft-start control features.
- What is the bandwidth of the error amplifier in the UC2875DWPTR?
The error amplifier has a bandwidth in excess of 10MHz.
