Overview
The UC3843AD8G4 is a fixed-frequency, current-mode PWM (Pulse Width Modulation) controller produced by Texas Instruments. This integrated circuit is specifically designed for off-line and DC-DC converter applications, requiring minimal external components. It features a trimmed oscillator for precise duty cycle control, a temperature-compensated reference, a high-gain error amplifier, a current sensing comparator, and a high-current totem pole output for driving Power MOSFETs.
Key Specifications
| Parameter | Symbol | Conditions | Min. | Typ. | Max. | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 30 | V | |||
| Output Current | IO | ±1 | A | |||
| Analog Inputs | V(ANA) | -0.3 | 6.3 | V | ||
| Error Amp Output Sink Current | ISINK (E.A) | 10 | mA | |||
| Reference Output Voltage | VREF | TJ = 25°C, IREF = 1mA | 4.90 | 5.00 | 5.10 | V |
| Oscillation Frequency | f | TJ = 25°C | 47 | 52 | 57 | kHz |
| Operating Temperature | TA | 0 | 70 | °C | ||
| Storage Temperature Range | TSTG | -65 | 150 | °C |
Key Features
- Low start-up current
- Maximum duty cycle clamp
- Under-voltage lockout (UVLO) with hysteresis
- Operating frequency up to 500 kHz
- Trimmed oscillator for precise duty cycle control
- Temperature-compensated reference
- High-gain error amplifier
- Current sensing comparator
- High-current totem pole output for driving Power MOSFETs
Applications
The UC3843AD8G4 is designed for use in off-line and DC-DC converter applications. It is particularly suited for power supply designs that require high efficiency, precision, and reliability. Common applications include:
- Switch-mode power supplies
- DC-DC converters
- Power factor correction circuits
- High-frequency switching applications
Q & A
- What is the operating temperature range of the UC3843AD8G4? The operating temperature range is from 0°C to 70°C.
- What is the maximum supply voltage for the UC3843AD8G4? The maximum supply voltage is 30 V.
- What is the typical oscillation frequency of the UC3843AD8G4? The typical oscillation frequency is 52 kHz.
- Does the UC3843AD8G4 have under-voltage lockout (UVLO) protection? Yes, it has UVLO with hysteresis.
- What is the reference output voltage of the UC3843AD8G4? The reference output voltage is typically 5 V.
- What types of packages are available for the UC3843AD8G4? It is available in SOIC (8-pin and 14-pin) and PDIP (8-pin) packages.
- What is the maximum output current of the UC3843AD8G4? The maximum output current is ±1 A.
- Is the UC3843AD8G4 RoHS compliant? Yes, it is RoHS compliant and free of Sb/Br.
- What is the storage temperature range for the UC3843AD8G4? The storage temperature range is from -65°C to 150°C.
- What are some common applications of the UC3843AD8G4? Common applications include switch-mode power supplies, DC-DC converters, power factor correction circuits, and high-frequency switching applications.
