UCC2809-1 (ACTIVE)

Economy Primary Side Controller

Economy Primary Side Controller - UCC2809-1
Datasheet
 

Special note

You can program this part for 90% Maximum Duty Cycle for frequencies of 250kHz or less with added components, per SLUA251

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

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Parametrics Compare all products in PWM and Resonant Controller

 
Topology
Control Method
Vin (Min) (V)
Vin (Max) (V)
Frequency (Max) (kHz)
UVLO Thresholds On/Off (V)
Duty Cycle (Max) (%)
Gate Drive (Typ) (A)
Features
Rating
Operating Temperature Range (C)
Pin/Package
UCC2809-1 UCC2809-2 UCC3809-1 UCC3809-2
Boost
Flyback
Forward   
Boost
Flyback
Forward   
Boost
Buck
Flyback
Forward   
Boost
Buck
Flyback
Forward   
Current
Feedforward
Voltage   
Current
Feedforward
Voltage   
Current
Feedforward
Voltage   
Current
Feedforward
Voltage   
8    8    8    8   
19    19    19    19   
1000    1000    1000    1000   
10/8    15/8    10/8    15/8   
70    70    70    70   
0.8    0.8    0.8    0.8   
Multi-topology
Soft Start   
Multi-topology
Soft Start   
Multi-topology
Soft Start   
Multi-topology
Soft Start   
Catalog    Catalog    Catalog    Catalog   
-40 to 85    -40 to 85    0 to 70    0 to 70   
8SOIC
8TSSOP
8VSSOP   
8SOIC
8TSSOP
8VSSOP   
8PDIP
8SOIC
8TSSOP
8VSSOP   
8PDIP
8SOIC
8TSSOP
8VSSOP