UCC28740D Part Information

Details for UCC28740D by Texas Instruments

Electronic & Electrical Components > Semiconductors - ICs > Power Management

Buy UCC28740D Directly from Texas Instruments (2523 in stock) at $0.4120

Part Description

The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to largeload steps. Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques. This device processes information from opto-coupled feedback and an auxiliary flyback winding for precise high-performance control of output voltage and current. An internal 700-V startup switch, dynamically controlled operating states, and a tailored modulation profile support ultra-low standby power without sacrificing startup time or output transient response. Control algorithms in the UCC28740 allow operating efficiencies to meet or exceed applicable standards. The drive output interfaces to a MOSFET power switch. Discontinuous conduction mode (DCM) with valley-switching reduces switching losses. Modulation of switching frequency and primary current-peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges. The controller has a maximum switching frequency of 100 kHz and always maintains control of the peakprimary current in the transformer. Protection features keep primary and secondary component stresses in check. A minimum switching frequency of 170 Hz facilitates the achievement of less than 10-mW noload power.

Part Downloads

Part Features

  • 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs
  • 700-V Startup Switch
  • Clamped Gate-Drive Output for MOSFET
  • Enables u00b11% Voltage Regulation and u00b15% Current Regulation Across Line and Load
  • Frequency Dithering to Ease EMI Compliance
  • Less than 10-mW No-Load Power Capability
  • Opto-Coupled Feedback for CV, and Primary-Side Regulation (PSR) for CC
  • Overvoltage, Low-Line, and Overcurrent Protection Functions
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency
  • SOIC-7 Package

Part Specifications

Input Voltage -
Output Voltage -
Output Current -
Supply Voltage Min 9V
Supply Voltage Max 35V
Controller IC Case Style SOIC
No. of Pins 7Pins
Frequency 100kHz
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (27-Jun-2018)
RoHS Compliant

Alternative Part Descriptions

  • IC, CV/CC FLYBK CONTROLLER, 38V, SOIC-7; Input Voltage:-; Output Voltage:-; Output Current:-; Supply Voltage Min:9V; Supply Voltage Max:35V; Controller IC Case Style:SOIC; No. of Pins:7Pins; Frequency:100kHz; Operating Temperature RoHS Compliant: Yes | Newark Electronics
  • Current Mode PWM Controller 25mA 7-Pin SOIC Tube | Avnet America
  • Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR) | Texas Instruments

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