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Product details

Parameters

Topology Boost, Flyback, Forward Control method Current, Feedforward, Voltage VCC (Min) (V) 15 VCC (Max) (V) 19 Duty cycle (Max) (%) 70 UVLO thresholds on/off (V) 15/8 Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 85 Gate drive (Typ) (A) 0.8 Features Adjustable Switching Frequency, Multi-topology, Soft Start Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 TSSOP (PW) 8 19 mm² 3 x 6.4 VSSOP (DGK) 8 15 mm² 3 x 4.9 open-in-new Find other PWM controllers & resonant controllers

Features

  • User Programmable Soft Start With Active Low Shutdown
  • User Programmable Maximum Duty Cycle
  • Accessible 5V Reference
  • Undervoltage Lockout
  • Operation to 1MHz
  • 0.4A Source/0.8A Sink FET Driver
  • Low 100µA Startup Current
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Description

The UCC3809 family of BCDMOS economy low power integrated circuits contains all the control and drive circuitry required for off-line and isolated DC-to-DC fixed frequency current mode switching power supplies with minimal external parts count. Internally implemented circuits include undervoltage lockout featuring startup current less than 100µA, a user accessible voltage reference, logic to ensure latched operation, a PWM comparator, and a totem pole output stage to sink or source peak current. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state.

Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. The UCC3809 family also features full cycle soft start.

The family has UVLO thresholds and hysteresis levels for off-line and DC-to-DC systems as shown in the table to the left.

The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP (N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and MSOP packages make the device ideal for applications where board space and height are at a premium.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet Economy Primary Side Controller datasheet (Rev. B) Nov. 19, 2004
User guide 10-Watt Flyback Converter Utilizing the UCC3809 (Rev. B) Sep. 14, 2001
User guide U-165 Reference Design: Isolated 50 Watt Flyback Converter Using Jun. 20, 2001
Application note Programming the UCC3809 for 90% Maximum Duty Cycle Clamp Jun. 04, 2001
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode Sep. 05, 1999
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers Sep. 05, 1999
Application note U-165 Design Rvw: Isolated 50 W Flyback Converter Using UCC3809 and UC3965 Sep. 05, 1999
Application note U-168 Implementing a Practical Off-line Lithium-Ion Charger Using the UCC3809 Sep. 05, 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
99
Description

The UCC3809EVM evaluation module is an isolated 10-W, 3.3-V converter designed for telecom input voltages, nominally -48 Vdc, but ranging from -32 Vdc to -75 Vdc. The UCC3809 economy primary-side controller is used as the pulse-width modulator (PWM), combined with a TLV431 low-voltage (...)

Design tools & simulation

SIMULATION MODEL Download
SLUM087A.ZIP (49 KB) - PSpice Model
SIMULATION MODEL Download
SLUM137.ZIP (23 KB) - TINA-TI Spice Model
SIMULATION MODEL Download
SLUM138.TSC (846 KB) - TINA-TI Reference Design

Reference designs

REFERENCE DESIGNS Download
36VDC - 75VDC Input, 3.3V@3A Output Isolated Flyback and Synchronous Buck
PMP4113 — This reference design uses the UCC2809 to control an isolated flyback that converts a standard 48V telecom input to an isolated 80V. An additional winding on the secondary of the flyback transformer generates an unregulated 12V rail. The TPS40193 controls a synchronous buck that generates a 3.3V/3A (...)
REFERENCE DESIGNS Download
18-60VDC Input Isolated Flyback Reference Design with a 54V/1.1A Output
PMP7361 PMP7361 is an isolated flyback converter with a 54V/1.1A output.  The 18-60VDC input is suitable for 24VDC industrial and 48VDC telecom applications.  The 54VDC output can be used to power PoE power sourcing equipment (PSE).
document-generic Schematic
REFERENCE DESIGNS Download
Universal AC Input 5V/2A USB Adaptor with Fixed Frequency Operation Reference Design
PMP9203 This reference design provides an isolated 5V/2A output from a universal 85-265VAC input. It uses the UCC2809 PWM controller to provide a fixed 100kHz operation. Maximum load efficiency is over 80%. The output is power limited (not current limited) so an additional load switch such as a TPS2001C may (...)
Design files
REFERENCE DESIGNS Download
Battery Charger with 50V DC Input 20A
PMP4308 The PMP4308 is a 50V DC in 20A battery charger solution which uses Buck upside-down topology. PWM controller UCC2809 is selected in the design.
Design files
REFERENCE DESIGNS Download
Isolated Sync Flyback (5V @ 0.2A) for Motor Control
PMP2431 — This low-cost (1W) isolated synchronous flyback regulator produces a 5V output from a low 24V input voltage and obtains a full-load efficiency of 85%. Possible applications include security systems, industrial, telecom and medical.

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options
TSSOP (PW) 8 View options
VSSOP (DGK) 8 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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