Overview
The UC3825DWG4 is a high-speed Pulse Width Modulation (PWM) controller from Texas Instruments, designed for high-frequency switched mode power supply applications. This controller is part of the UC1825 family and is optimized for use in either current-mode or voltage-mode systems, with the capability for input voltage feed-forward. It is particularly suited for applications requiring high switching frequencies and robust protection features.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Package Type | SOIC-16 (DW) | |
| Pins | 16 | |
| Operating Temperature Range | 0 to 70 | °C |
| Supply Voltage | Up to 30 | V |
| Propagation Delay to Output | 50 ns | |
| Peak Output Current | 1.5 A | |
| Start Up Current | 1.1 mA | |
| Under-Voltage Lockout Start Threshold | 8.8 to 9.6 | V |
| UVLO Hysteresis | 0.4 to 1.2 | V |
Key Features
- Compatible with Voltage or Current Mode Topologies
- Practical Operation Switching Frequencies to 1 MHz
- 50 ns Propagation Delay to Output
- High Current Dual Totem Pole Outputs (1.5 A Peak)
- Wide Bandwidth Error Amplifier
- Fully Latched Logic with Double Pulse Suppression
- Pulse-by-Pulse Current Limiting
- Soft Start / Max. Duty Cycle Control
- Under-Voltage Lockout with Hysteresis
- Low Start Up Current (1.1 mA)
Applications
The UC3825DWG4 is suitable for a variety of high-frequency switched mode power supply applications, including:
- DC-DC converters
- Switch mode power supplies
- High-frequency power amplifiers
- Current-mode and voltage-mode control systems
Q & A
- What is the operating temperature range of the UC3825DWG4?
The operating temperature range is 0 to 70°C.
- What is the maximum switching frequency of the UC3825DWG4?
The UC3825DWG4 can operate at switching frequencies up to 1 MHz.
- What is the propagation delay to the output of the UC3825DWG4?
The propagation delay to the output is 50 ns.
- What is the peak output current capability of the UC3825DWG4?
The peak output current is 1.5 A.
- Does the UC3825DWG4 support both voltage and current mode topologies?
Yes, it is compatible with both voltage and current mode topologies.
- What is the start-up current of the UC3825DWG4?
The start-up current is 1.1 mA.
- What protection features does the UC3825DWG4 include?
The UC3825DWG4 includes under-voltage lockout with hysteresis, pulse-by-pulse current limiting, and soft start/max duty cycle control.
- How does the UC3825DWG4 handle double pulse suppression?
The logic is fully latched to provide jitter-free operation and prohibit multiple pulses at an output.
- What is the typical application of the UC3825DWG4?
It is typically used in high-frequency switched mode power supply applications, including DC-DC converters and switch mode power supplies.
- Is the UC3825DWG4 RoHS compliant?
Yes, the UC3825DWG4 is RoHS compliant.
