UCC2809-1 Economy Primary Side Controller | TI.com

UCC2809-1 (ACTIVE) Economy Primary Side Controller

Economy Primary Side Controller - UCC2809-1
Datasheet
 

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.

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

Parametrics

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Part number Order Topology Control method VCC (Min) (V) VCC (Max) (V) Frequency (Max) (kHz) UVLO thresholds on/off (V) Duty cycle (Max) (%) Gate drive (Typ) (A) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
UCC2809-1 Order now Boost
Flyback
Forward    
Current
Feedforward
Voltage    
10     19     1000     10/8     70     0.8     Adjustable Switching Frequency
Multi-topology
Soft Start    
Catalog     -40 to 85     SOIC | 8
TSSOP | 8
VSSOP | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8TSSOP: 19 mm2: 6.4 x 3 (TSSOP | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
UCC2809-2 Order now Boost
Flyback
Forward    
Current
Feedforward
Voltage    
15     19     1000     15/8     70     0.8     Adjustable Switching Frequency
Multi-topology
Soft Start    
Catalog     -40 to 85     SOIC | 8
TSSOP | 8
VSSOP | 8    
8SOIC: 19 mm2: 3.91 x 4.9 (SOIC | 8)
8TSSOP: 19 mm2: 6.4 x 3 (TSSOP | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)