TL3842DRE4-8
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Output Type | Transistor Driver |
| Number of Outputs | 1 |
| Supplier Device Package | 8-SOIC |
| Output Configuration | Positive |
| Function | Step-Up, Step-Up/Step-Down |
| Topology | Boost, Flyback, Forward |
| Voltage - Supply (Vcc/Vdd) | 10V ~ 30V |
| Control Features | Frequency Control |
| Frequency - Switching | Up to 500kHz |
| Synchronous Rectifier | No |
| Serial Interfaces | - |
| Output Phases | 1 |
| Duty Cycle (Max) | 97% |
| Clock Sync | No |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | TL3842 |
| REACH Status | REACH Unaffected |
| Standard Package | 2,500 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
TL3842DRE4-8 Regulator Positive Step-Up/Step-Down DC-DC Controller IC 8-SOIC
The TL3842DRE4-8 is a TI current-mode PWM controller packaged in SOIC-8, designed for high-performance off-line DC-DC power converters. It operates from 7V to 30V supply voltage, features 100kHz maximum switching frequency, integrated oscillator, high-current totem-pole gate driver and cycle-by-cycle current limiting. This controller contains an internal 5.0V reference and error amplifier, delivering fast response for peak current mode regulation, and supports wide temperature range from -40°C to 85°C, widely adopted for flyback, boost and forward power topologies in isolated and non-isolated power supplies.
Key Features and Applications
● Peak current mode control for fast transient response and simple loop compensation design.
● Internal trimmed 5.0V bandgap reference and high-gain error amplifier for precise output regulation.
● High-current totem-pole output gate driver capable of directly driving power MOSFET.
● Built-in cycle-by-cycle current limit to restrict peak switch current and prevent overload damage.
● Under-voltage lockout with 16V turn-on threshold and 10V hysteresis to avoid unstable startup.
● Maximum 100kHz operating frequency with external resistor and capacitor to set switching rate.
This PWM controller is commonly used for flyback power adapters, isolated auxiliary power supplies, DC-DC boost converters, battery chargers, industrial control power modules, consumer switching power supplies and off-line power conversion boards. It provides reliable regulation for low to medium power isolated power systems, suitable for power supply designs requiring simple peripheral circuits and fast current loop response.
FAQ
Q: Can TL3842DRE4-8 work at high input voltage without optocoupler?
A: It needs optocoupler feedback for isolated flyback designs. Add proper gate resistor for MOSFET driving and place current sense resistor close to CS pin to reduce noise interference.
Alternative PWM controller models
1. UC3842D: Standard industrial grade current mode PWM controller with identical pinout and electrical parameters as a direct replacement.
2. TL3843DRE4-8: PWM controller with lower UVLO threshold, ideal for low input voltage startup applications.
3. UC2842D: Extended temperature version of 3842 series PWM controller for harsh industrial environments with wider temperature range.
