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TC38C46COE Datasheet(PDF) 8 Page - TelCom Semiconductor, Inc |
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TC38C46COE Datasheet(HTML) 8 Page - TelCom Semiconductor, Inc |
8 / 10 page 4-108 TELCOM SEMICONDUCTOR, INC. CMOS CURRENT MODE PWM CONTROLLERS TC18C46 TC28C46 TC38C46 Figure 6. Oscillator Circuit 0.5V 3.5V ICHARGE 3.5V RO 8 CT 9 2mA DISCHARGE CURRENT SYNC 10 VDD 3.5V PIN 8 PIN 10 TCHG OUTPUT DEAD TIME (TD) + – RT TD 1/FO RT Selection of Timing Capacitor and Resistor (CT & RT) 1) First determine the frequency of operation FO and the desired " dead" time", TD (see Fig.6 graph). We need to choose RT and CT. RT 3) During discharge (TD), the discharge current pulls 2 m A out of CT, minus the ICHG that keeps trying to charge it: 2 m A - ICHG = CT = 3.0 Volts ∆V ,where ∆V= 3.0 Volts 2) The current mirror in Fig. 6 , shows: ICHG = 3.5 V . Also, ICHG = CT Where, and ∆T = TCHG ∆T ∆T= T D 3 CT = TD (.002 - 3.5) RT Knowing TD choosing RT permits calculation of CT . Substituting and rearranging, ∆V ∆V = 3.5 - 0.5 ∆T |
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