Unitrode UCC3809-1
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. The output stage, suitable for driving N-Channel MOSFETs, is low in the off state. The UCC3809 family also features full cycle soft start.| Part No. | UCC3809-1 |
|---|---|
| Datasheet | UCC3809-1 Download |
| Manufacturer |  Unitrode |
| Description | Economy Primary Side Controller |
| Buy | Stock & Price |
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 PART TURN ON TURN OFF NUMBER THRESHOLD THRESHOLD UCCX809-1 10V 8V UCCX809-2 15V 8V
DESCRIPTION
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. Oscillator frequency and maximum duty cycle are programmed with two resistors and a capacitor. 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.
