Overview
The TL3845PG4, produced by Texas Instruments, is a current-mode PWM (Pulse Width Modulation) controller designed for use in off-line and DC-to-DC converters. This integrated circuit is part of the TL384x series and offers a range of features that make it suitable for various power management applications. It is optimized for fixed-frequency current-mode control schemes and requires a minimum number of external components to operate effectively.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Reference Output Voltage | IO = 1 mA, TA = 25°C | 4.9 | 5 | 5.1 | V |
| Line Regulation | VCC = 12 V to 25 V | 6 | 20 | 20 | mV |
| Load Regulation | IO = 1 mA to 20 mA | 6 | 25 | 25 | mV |
| Temperature Coefficient of Output Voltage | 0.2 | 0.4 | 0.4 | mV/°C | |
| Operating Frequency | 500 | kHz | |||
| Undervoltage Lockout (UVLO) | 8.4V/7.6V | V | |||
| Start-up Current | < 1 | mA |
Key Features
- Optimized for off-line and DC-to-DC converters
- Low start-up current (< 1mA)
- 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
- Error amplifier with low output resistance
- Designed to be interchangeable with UC2842 and UC3842 series
Applications
- Switching regulators of any polarity
- Transformer-coupled DC/DC converters
Q & A
- What is the TL3845PG4 used for?
The TL3845PG4 is used in off-line and DC-to-DC converters as a current-mode PWM controller. - What is the operating frequency of the TL3845PG4?
The operating frequency of the TL3845PG4 is 500 kHz. - What is the undervoltage lockout (UVLO) voltage for the TL3845PG4?
The UVLO voltage for the TL3845PG4 is 8.4V/7.6V. - What is the start-up current of the TL3845PG4?
The start-up current of the TL3845PG4 is less than 1 mA. - Does the TL3845PG4 have automatic feed-forward compensation?
Yes, the TL3845PG4 has automatic feed-forward compensation. - What type of output does the TL3845PG4 have?
The TL3845PG4 has a high-current totem-pole output. - Is the TL3845PG4 interchangeable with other series?
Yes, the TL3845PG4 is designed to be interchangeable with the UC2842 and UC3842 series. - What are the typical applications of the TL3845PG4?
The TL3845PG4 is typically used in switching regulators of any polarity and transformer-coupled DC/DC converters. - What is the temperature range for the TL3845PG4?
The TL3845PG4 operates over a temperature range of 0-70°C. - Does the TL3845PG4 have pulse-by-pulse current limiting?
Yes, the TL3845PG4 has pulse-by-pulse current limiting.
