UCC38C40DR

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UCC38C40DR

IC REG CTRLR MULT TOPOLOGY 8SOIC

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Especificaciones

Supplier Texas Instruments
Package Tape & Reel (TR),Cut Tape (CT)
ProductStatus Active
OutputType Transistor Driver
Function Step-Up, Step-Up/Step-Down
OutputConfiguration Positive
Topology Boost, Flyback, Forward Converter
NumberofOutputs 1
OutputPhases 1
Voltage-Supply(Vcc/Vdd) 6.6V ~ 18V
Frequency-Switching Up to 1MHz
DutyCycle(Max) 96%
SynchronousRectifier No
ClockSync No
ControlFeatures Frequency Control
OperatingTemperature 0°C ~ 70°C (TJ)
MountingType Surface Mount
Package/Case 8-SOIC (0.154, 3.90mm Width)

Descripción general

Description

- UCC38C40DR is a Texas Instruments current-mode PWM controller for switch-mode power supplies (SMPS), mainly used for primary-side control of isolated converters (e.g., flyback) and can be used in DC-DC topologies with an external MOSFET.
- It provides fixed or programmable switching frequency and current-sense–based regulation, with slope compensation for stable operation.
- Protections include undervoltage lockout (UVLO), overcurrent/short-circuit protection, and soft-start to limit inrush and prevent transients from triggering false faults.
- It requires external power MOSFET and a transformer; startup biasing is via Vcc (often from a startup resistor or high-voltage supply), with a feedback pin (COMP/FB) and a current-sense pin (IS) for regulation.
- The DR suffix denotes a TI packaging variant (RoHS-compliant version in a specific package); consult the datasheet for exact pinout and packaging.
- For precise electrical characteristics and typical application circuits, refer to the UCC38C40 data sheet.

Features

UCC38C40DR is a fixed‑frequency, current‑mode PWM controller for off‑line SMPS (flyback/forward). Key features include:
- Valley-switching capability for higher efficiency
- Integrated high‑voltage start‑up current source and bias regulator
- Undervoltage lockout (UVLO) with hysteresis
- Peak current‑mode control with slope compensation
- Cycle‑by‑cycle current limit with latch and protection (overcurrent/short‑circuit)
- Thermal shutdown protection
- Soft‑start to limit inrush and output overshoot
- External frequency setting network (RT/CT) for programmable switching frequency
- Enable/Disable input for safe shutdown
- Drives an external power MOSFET gate (primary‑side controller in isolated supplies)
- 8‑pin DR package (RoHS)
Note: actual behavior (hiccup vs. latch on OC, exact voltage ranges) varies by revision and application; consult the datasheet for definitive specifications.

Package

8-pin SOIC package (D) format, RoHS compliant, typically supplied in Tape & Reel.

Pinout

- Pin count: 8 pins (SOIC-8/DIP-8 package, DR RoHS variant)
- Function: Off-line flyback PWM controller for switch‑mode power supplies. Provides current‑mode regulation, startup/high‑voltage regulator, undervoltage lockout, timing (oscillator) set by a capacitor, and inputs for current sense and feedback, plus an output to drive an external MOSFET.

Manufacturer

- Manufacturer: Texas Instruments Incorporated (TI).
- What kind of company: American multinational semiconductor company that designs and manufactures analog and mixed-signal integrated circuits and embedded processors; headquartered in Dallas, Texas.

Application

UCC38C40DR is a high-voltage, current-mode PWM controller. Common application areas include:
- Off-line isolated SMPS (flyback/forward) for low-to-medium power
- AC-DC adapters and wall-wart supplies
- Battery chargers and LED driver circuits
- Standby/auxiliary power for consumer electronics
- General-purpose isolated SMPS requiring simple current-mode control

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