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UCC1581 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC1581 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 9 page 4 UCC1581 UCC2581 UCC3581 The UCC3581’s oscillator allows the user the flexibility to program the frequency and the duty cycle by adjusting two resistors and a capacitor. Application Diagram Fig. 1 shows these components as RT1, RT2, and CT. RT1 pro- grams the timing capacitor charging current which results in a linear ramp charging CT. Discharge of CT is accom- plished though RT2 which results in a standard RC dis- charge waveform. The oscillator on-time (CT charging) is calculated by the formula tRT C ON T =• • 0 082 1 . . The off-time (CT discharging) is calculated by the formula tRT C OFF T =• • 095 1 . . Resistor RT1 programs the charging current. The current is 2.0V RT1 . CT charging current is 9.2 times the current in RT1. RT1 can range from 220k Ω to 1MΩ. Minimum capacitor size is 100pF, and minimum RT2 size is 10k. A Block Diagram of the Oscillator is shown in Fig. 2. The oscillator also has an external synchronization pin. When a low to high level is detected, and if the oscilla- tor’s output is in the high state (CT charging), the oscilla- tor output immediately goes low and CT starts discharging. The sync input is rising edge sensitive and is ignored when the oscillator output is low. APPLICATION INFORMATION 1 3 2 14 C T RT2 V IN 1 µF D2 4 Q1 5 6 1 µF 7 T1 R L REF & E/A U1 CT GT VDD OUT GND REF ISEN V IN 8 VC 9 DCMIN 10 SS 11 EN U1 REF REF C SS 12 RT1 13 SYNC RT2 RT1 REF UCC3581 D1 BSS129 OR EQUIV. Figure 1. Application diagram. UDG-99043 Figure 2. Oscillator. UDG-96105 |
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