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CS5124XDR8 Datasheet(PDF) 7 Page - Cherry Semiconductor Corporation |
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CS5124XDR8 Datasheet(HTML) 7 Page - Cherry Semiconductor Corporation |
7 / 10 page 7 Application Information: continued The Line BIAS pin shows a significant change in the regu- lated VCC voltage when sinking large currents. This will show up as poor line regulation with a low value pull-up resistor. Typical regulated VCC vs BIAS pin sink current is shown in Figure 1. Figure 1. Regulated VCC vs BIAS Sink Current Clock Synchronization Pin (CS5126 Only) The CS5126 can be synchronized to signals ranging from 30% slower to several times faster than the internal oscilla- tor frequency. If the part is synchronized to a fast signal, maximum duty cycle will be reduced as the frequency increases as shown in Figure 2. Figure 2: CS5126 Maximum Duty Cycle vs Frequency (Synchronized Operation) If the converter is initially free running and a sync signal is applied, the current oscillator cycle will terminate and the oscillator will lock on to the sync signal. The SYNC pin works with a positive edge triggered signal. When the sync signal transitions high the current PWM cycle terminates and a new cycle begins as shown in Figure 3. The typical phase lag between the rising edge of the SYNC signal and the rising edge of the Gate is shown in Figure 4. When this pin is held high or low the internal clock determines the oscillator frequency. Figure 3. Synchronized Operation Figure 4 : Typical Phase Lag between SYNC and GATE on. Gate Drive Rail to rail gate driver operation can be obtained (up to 13.5V) over a range of MOSFET input capacitance if the gate resistor value is kept low. Figure 5 shows the high gate drive level vs. the series gate resistance with VCC = 8V driving an IRF220. Figure 5. Gate Drive vs Gate Resistor Driving an IRF220 (VCC = 8V) 8.5 8 7.5 7 6.5 6 0 0.3 0.5 2.5 5 11 Gate Resistor Value 140 130 120 110 100 90 80 70 200kHz 300kHz 400kHz 500kHz 600kHz SYNC OSC GATE 125°C -40°C 0.82 0.77 0.72 200kHz 300kHz 400kHz 500kHz 600kHz Frequency 25°C 8.3 8.2 8.1 8 7.9 5µ 10µA20µA50µA 100µA 200µA Bias Current (IBIAS) |
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