Overview
The UC3842ANG4 is a current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. It is part of the UCx84xA family, which is designed to control current-mode or switched-mode power supplies. This device is optimized for off-line and DC-DC converters, offering several improved features over its predecessors. It is particularly noted for its low start-up current, trimmed oscillator discharge current, and enhanced load response characteristics.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | PDIP-8 | - |
| Operating Temperature Range | 0 to 70 | °C |
| Control Method | Peak Current Mode | - |
| Frequency (Max) | 500 kHz | - |
| Frequency (Min) | 26 kHz | - |
| Gate Drive (Typ) | 1 A | - |
| UVLO Thresholds On/Off | 16/10 V | - |
| Vin (Max) | 30 V | - |
| Vin (Min) | 10 V | - |
| Duty Cycle (Max) | 100% | - |
| Topology | Boost, Buck, Buck-Boost, Flyback, Forward | - |
Key Features
- Optimized for Off-Line and DC-DC Converters
- Low Start-Up Current (< 0.5mA)
- Trimmed Oscillator Discharge Current
- Automatic Feedforward Compensation
- Pulse-by-Pulse Current Limiting
- Enhanced Load Response Characteristics
- Undervoltage Lockout With Hysteresis
- Double Pulse Suppression
- High-Current Totem Pole Output
- Internally-Trimmed Bandgap Reference
- Up to 500kHz Operation
Applications
The UC3842ANG4 is suitable for a variety of power supply applications, including:
- Off-Line Power Supplies
- DC-DC Converters
- Boost, Buck, Buck-Boost, Flyback, and Forward Converters
- High-Frequency Switching Power Supplies
Q & A
- What is the operating temperature range of the UC3842ANG4?
The operating temperature range is from 0°C to 70°C.
- What is the maximum switching frequency of the UC3842ANG4?
The maximum switching frequency is up to 500 kHz.
- What are the UVLO thresholds for the UC3842ANG4?
The UVLO thresholds are 16V for enable and 10V for disable.
- What is the typical gate drive current of the UC3842ANG4?
The typical gate drive current is 1 A.
- What are the supported topologies for the UC3842ANG4?
The supported topologies include Boost, Buck, Buck-Boost, Flyback, and Forward converters.
- What is the maximum duty cycle of the UC3842ANG4?
The maximum duty cycle is 100%.
- What is the start-up current of the UC3842ANG4?
The start-up current is less than 0.5 mA.
- Is the UC3842ANG4 suitable for high-frequency applications?
Yes, it is suitable for high-frequency switching power supplies up to 500 kHz.
- What package type is the UC3842ANG4 available in?
The UC3842ANG4 is available in an 8-pin PDIP package.
- Is the UC3842ANG4 recommended for new designs?
Yes, the UC3842ANG4 is active and recommended for new designs.
