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UCC2809-1 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC2809-1 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 11 page UCC1809-1/-2 UCC2809-1/-2 UCC3809-1/-2 SLUS166B - NOVEMBER 1999 - REVISED NOVEMBER 2004 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 Economy Primary Side Controller 1 3 2 7 FB + – + – 1V + – 6µA +5V 0.5V OSC 4 R Q S – + 5V REF 15/8V 10/8V VDD 8 REF CREF CVDD 5 + – VREF SS RT1 RT2 CSS DISABLE NOISE FILTER SLOPE COMP CURRENT SENSE FEEDBACK RSTART VIN CLK PWM LATCH UVLO 1V VOUT CT 6 17.5V OUT GND TYPICAL APPLICATION DIAGRAM UDG-99036 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 100 µA, a user ac- cessible voltage reference, logic to ensure latched operation, a PWM com- parator, 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. PART NUMBER TURN ON THRESHOLD TURN OFF THRESHOLD UCCX809-1 10V 8V UCCX809-2 15V 8V application INFO available |
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Similar Description - UCC2809-1 |
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