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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Economy Primary Side Controller datasheet (Rev. B) | 19 Nov 2004 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| 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 |
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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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOIC (D) | 8 | Ultra Librarian |
| VSSOP (DGK) | 8 | Ultra Librarian |
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