Overview
The UC2875DWP, manufactured by Texas Instruments, is a bipolar phase-shifted full-bridge controller integrated circuit. This device 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 UC2875DWP can be configured for either voltage or current mode operation and includes features such as programmable output turn-on delay, soft-start control, and over-current protection.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 28-SOIC (0.295", 7.50mm Width) |
| Operating Temperature Range | -25°C to 85°C |
| Supply Voltage (Vcc/Vdd) | 9.5 V ~ 20 V |
| Startup Voltage | 10.75V |
| Duty Cycle | 0 to 100% |
| Switching Frequency | Up to 1MHz |
| Output Type | Four 2A Totem Pole Outputs |
| Fault Protection | Current Limiting, Over-Current Shutdown |
| Control Features | Frequency Control, Soft Start, Sync |
| Mounting Type | Surface Mount |
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 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
Applications
The UC2875DWP is suitable for various high-efficiency power conversion applications, including offline switchers, AC-DC converters, and other power management systems that require precise control over switching frequencies and duty cycles. It is particularly useful in designs where resonant zero-voltage switching is necessary for minimizing losses and improving overall system efficiency.
Q & A
- What is the primary function of the UC2875DWP?
The UC2875DWP is a bipolar phase-shifted full-bridge controller IC designed to control a bridge power stage by phase-shifting the switching of one half-bridge with respect to the other. - What are the operating temperature ranges for the UC2875DWP?
The operating temperature range is -25°C to 85°C. - What is the maximum switching frequency of the UC2875DWP?
The maximum switching frequency is up to 1MHz. - What type of output does the UC2875DWP have?
The UC2875DWP has four 2A totem pole outputs. - Does the UC2875DWP support external clock synchronization?
Yes, it supports external clock synchronization through the CLOCKSYNC pin. - What is the startup voltage for the UC2875DWP?
The startup voltage is 10.75V. - What kind of fault protection does the UC2875DWP offer?
The UC2875DWP offers current limiting and over-current shutdown with full-cycle restart. - Can the UC2875DWP be used in both voltage and current mode topologies?
Yes, it is compatible with both voltage and current mode topologies. - What is the purpose of the undervoltage lockout (UVLO) feature?
The UVLO feature maintains all outputs in an active-low state until the supply reaches a 10.75V threshold, ensuring reliable startup. - How many devices can be synchronized using the CLOCKSYNC pin?
Up to 5 devices can be synchronized with the operational frequency determined by the fastest device.
