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UCC3809-2

ACTIVE

Economy primary side controller with 15V/8V UVLO, 0C to 70C

Product details

Topology Boost, Buck, Flyback, Forward Control mode Current Duty cycle (max) (%) 70 Switching frequency (max) (kHz) 1000 Features Adjustable switching frequency, Multi-topology, Soft start UVLO thresholds on/off (V) 15/8 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 0.8 Vin (max) (V) 19
Topology Boost, Buck, Flyback, Forward Control mode Current Duty cycle (max) (%) 70 Switching frequency (max) (kHz) 1000 Features Adjustable switching frequency, Multi-topology, Soft start UVLO thresholds on/off (V) 15/8 Operating temperature range (°C) 0 to 70 Rating Catalog Gate drive (typ) (A) 0.8 Vin (max) (V) 19
SOIC (D) 8 29.4 mm² 4.9 x 6 TSSOP (PW) 8 19.2 mm² 3 x 6.4 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • 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
  • 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

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.

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

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Type Title Date
* Data sheet Economy Primary Side Controller datasheet (Rev. B) 19 Nov 2004
Analog Design Journal Current balancing in four-pair, high-power PoE applications 18 May 2007
User guide 10-Watt Flyback Converter Utilizing the UCC3809 (Rev. B) 14 Sep 2001
User guide U-165 Reference Design: Isolated 50 Watt Flyback Converter Using 20 Jun 2001
Application note Programming the UCC3809 for 90% Maximum Duty Cycle Clamp 04 Jun 2001
Application note DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode 05 Sep 1999
Application note DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers 05 Sep 1999
Application note U-165 Design Rvw: Isolated 50 W Flyback Converter Using UCC3809 and UC3965 05 Sep 1999
Application note U-168 Implementing a Practical Off-line Lithium-Ion Charger Using the UCC3809 05 Sep 1999

Design & development

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

Evaluation board

UCC3809EVM — UCC3809 Evaluation Module

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 (...)

User guide: PDF
Not available on TI.com
Simulation model

UCC1/2/3809-2 TINA-TI Transient Reference Design

SLUM138.TSC (846 KB) - TINA-TI Reference Design
Simulation model

UCC1/2/3809-2 TINA-TI Transient Spice Model

SLUM137.ZIP (23 KB) - TINA-TI Spice Model
Simulation model

UCCx809-2 Family Unencrypted PSpice Transient Model Package (Rev. A)

SLUM087A.ZIP (49 KB) - PSpice Model
Package Pins Download
SOIC (D) 8 View options
TSSOP (PW) 8 View options
VSSOP (DGK) 8 View options

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