Overview
The UC3843DR-8, produced by Texas Instruments, is a single-ended 500kHz current-mode PWM (Pulse Width Modulation) controller. This device is part of the UCx84x series, which is designed to implement off-line or DC-to-DC fixed-frequency current-mode control schemes with a minimal number of external components. The UC3843DR-8 is optimized for use in off-line and DC-to-DC converters, offering features such as low start-up current, automatic feedforward compensation, and pulse-by-pulse current limiting. It operates within a temperature range of 0°C to 70°C and is packaged in an 8-pin SOIC (D) package.
Key Specifications
| Parameter | Symbol | Value | Unit |
|---|---|---|---|
| Package | SOIC (D) | ||
| Pins | 8 | ||
| Operating Temperature Range | 0 to 70 | °C | |
| Supply Voltage | VCC | 30 | V |
| Output Current | IO | ±1 | A |
| Analog Inputs (Pin 2, 3) | V(ANA) | -0.3 to 6.3 | V |
| Error Amp Output Sink Current | ISINK (E.A) | 10 | mA |
| Power Dissipation at TA≤25°C (8SOP) | PD | 460 | mW |
| Storage Temperature Range | TSTG | -65 to +150 | °C |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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
- Error amplifier with low output resistance
Applications
The UC3843DR-8 is designed for use in various power supply and converter applications, including:
- Off-line power supplies
- DC-to-DC converters
- Fixed-frequency current-mode control schemes
- High-reliability systems requiring precise current-mode control
Q & A
- What is the operating temperature range of the UC3843DR-8?
The UC3843DR-8 operates within a temperature range of 0°C to 70°C.
- What is the maximum supply voltage for the UC3843DR-8?
The maximum supply voltage for the UC3843DR-8 is 30V.
- What is the output current capability of the UC3843DR-8?
The output current capability of the UC3843DR-8 is ±1A.
- What is the frequency of operation for the UC3843DR-8?
The UC3843DR-8 can operate up to 500kHz.
- Does the UC3843DR-8 have undervoltage lockout (UVLO) protection?
Yes, the UC3843DR-8 features undervoltage lockout with hysteresis.
- What type of output stage does the UC3843DR-8 have?
The UC3843DR-8 has a high-current totem-pole output stage designed to source or sink high-peak current.
- Is the UC3843DR-8 suitable for DC-to-DC converter applications?
Yes, the UC3843DR-8 is optimized for DC-to-DC converter applications.
- What is the package type and pin count of the UC3843DR-8?
The UC3843DR-8 is packaged in an 8-pin SOIC (D) package.
- Does the UC3843DR-8 have automatic feedforward compensation?
Yes, the UC3843DR-8 includes automatic feedforward compensation.
- What is the storage temperature range for the UC3843DR-8?
The storage temperature range for the UC3843DR-8 is -65°C to +150°C.
