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ISL6268CAZ-T Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL6268CAZ-T Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 14 page 10 FN6348.0 August 22, 2006 Programming the PWM Switching Frequency The ISL6268 does not use a clock signal to produce PWM. The PWM switching frequency FSW is programmed by the resistor RFSET that is connected from the FSET pin to the GND pin. The approximate PWM switching frequency is written as: Estimating the value of RFSET is written as: where: -FSW is the PWM switching frequency -RFSET is the FSW programming resistor - K = 75 x 10-12 It is recommended that whenever the control loop compensation network is modified, FSW should be checked for the correct frequency and if necessary, adjust RFSET. Compensation Design The LC output filter has a double pole at its resonant frequency that causes the phase to abruptly roll downward. The R3 modulator used in the ISL6268 makes the LC output filter resemble a first order system in which the closed loop stability can be achieved with a Type II compensation network. Your local Intersil representative can provide a PC-based tool that can be used to calculate compensation network component values and help simulate the loop frequency response. The compensation network consists of the internal error amplifier of the ISL6268 and the external components R1, R2, C1, and C2, as well as the frequency setting components RFSET and CFSET (all identified in Figure 5). F SW 1 KR FSET ⋅ --------------------------- = (EQ. 7) R FSET 1 KF SW • -------------------- = (EQ. 8) GND PHASE UG LG COUT LOUT ISL6268 QHIGH_SIDE RFSET CFSET QLOW_SIDE EA + VIN VIN VO FB R2 R1 C1 C2 - FSET COMP REF CESR GATE DRIVERS DCR R3 VOUT FIGURE 5. COMPENSATION REFERENCE CIRCUIT MODULATOR ISL6268 |
Similar Part No. - ISL6268CAZ-T |
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Similar Description - ISL6268CAZ-T |
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