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 | |
| 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 | ||
| More literature | Programming the UCC3809 for 90% Maximum Duty Cycle Clamp | 04 Jun 2001 | ||
| More literature | DN-62 Switching Power Supply Topology Voltage Mode vs. Current Mode | 05 Sep 1999 | ||
| More literature | DN-89 Comparing the UC3842, UCC3802, and UCC3809 Primary Side PWM Controllers | 05 Sep 1999 | ||
| More literature | U-165 Design Rvw: Isolated 50 W Flyback Converter Using UCC3809 and UC3965 | 05 Sep 1999 | ||
| More literature | U-168 Implementing a Practical Off-line Lithium-Ion Charger Using the UCC3809 | 05 Sep 1999 |
For additional terms or required resources, click any title below to view the detail page where available.
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 | Download |
|---|---|---|
| SOIC (D) | 8 | View options |
| TSSOP (PW) | 8 | View options |
| VSSOP (DGK) | 8 | View options |
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.