TL3845是TI公司的一款PWM与谐振控制器产品，TL3845是电流模式 PWM 控制器，本页介绍了TL3845的产品说明、应用、特性等，并给出了与TL3845相关的TI元器件型号供参考。
TL3845 - 电流模式 PWM 控制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - TI公司（Texas Instruments，德州仪器）
- Optimized for Off-Line and DC-to-DC Converters
- Low Start-Up Current (< 1 mA)
- Automatic Feed-forward 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
- 500-kHz Operation
- Error Amplifier With Low Output Resistance
- Designed to be Interchangeable with UC2842 and UC3842 Series
- Switching regulators of any polarity
- Transformer-coupled DC/DC convertors
The TL284x and TL384x series of control integrated circuits provide the features that are necessary to implement off-line or DC-to-DC fixed-frequency current-mode control schemes, with a minimum number of external components. Some of the internally implemented circuits are an undervoltage lockout (UVLO), featuring a start-up current of less than 1 mA, and a precision reference trimmed for accuracy at the error amplifier input. Other internal circuits include logic to ensure latched operation, a pulse-width modulation (PWM) comparator (that also provides current-limit control), and a totem-pole output stage designed to source or sink high-peak current. The output stage, suitable for driving N-channel MOSFETs, is low when it is in the off state.
| PART NUMBER | PACKAGE (PIN) | BODY SIZE (NOM) |
|---|---|---|
| TLx84x | SOIC (8) | 4.90 mm × 3.91 mm |
| SOIC (14) | 8.65 mm × 3.91 mm | |
| PDIP (8) | 9.81 mm × 6.35 mm |
