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UCC25706DTR Datasheet(PDF) 5 Page - Texas Instruments |
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UCC25706DTR Datasheet(HTML) 5 Page - Texas Instruments |
5 / 12 page UCC25705, UCC25706, UCC35705, UCC35706 HIGHSPEED VOLTAGE MODE PULSE WIDTH MODULATOR SLUS473A – NOVEMBER 1999 – REVISED MARCH 2001 5 www.ti.com pin descriptions (continued) 7 2 5 8 OUT VDD 6 GND SQ Q RD RD RD 1 ILIM 200 mV CURRENT LIMIT 1 pF 20 k Ω 30 k Ω 0.7 V PWM S Q Q RD CLK PWM LATCH 100 mV 2 * I (MODE=1) 0 (MODE = 0) LOW LINE 1.0 V 30 * I (MODE=1) 80 Ω (MODE = 0) I RC VFF FB 3 DISCH 4 50 mV VDD MODE UCC35705 (8.8 V/8 V) UCC35706 (12 V/8 V) UVLO + – + – + – + – + – + – Figure 1. Block Diagram FUNCTIONAL DESCRIPTION oscillator and PWM The oscillator can be programmed to provide a duty cycle clamp or be configured to run at the maximum possible duty cycle. The PWM latch is set during the oscillator discharge and is reset by the PWM comparator when the CT waveform is greater than the feedback voltage. The voltage at the FB pin is attenuated before it is applied to the PWM comparator. The oscillator ramp is shifted by approximately 0.65-V at room temperature at the PWM comparator. The offset has a temperature coefficient of approximately –2 mV/ °C. The ILIM comparator adds a pulse by pulse current limit by resetting the PWM latch when VILIM > 200 mV. The PWM latch is also reset by a low line condition (VFF <1.0 V). All reset conditions are dominant; asserting any output will force a zero duty cycle output. oscillator with duty cycle clamp (MODE = 1) The timing capacitor CT is charged from ground to VFF through RT. The discharge path is through an on-chip current sink that has a value of 30 × IDISCH, where IDISCH is the current through the external resistor RDISCH. Since the charge and discharge currents are both proportional to VIN, their ratio, and the maximum duty cycle remains constant as VIN varies. |
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