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BM2P094F Datasheet(PDF) 10 Page - Rohm |
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BM2P094F Datasheet(HTML) 10 Page - Rohm |
10 / 23 page 10/19 Datasheet Datasheet BM2PXX4F Series TSZ02201-0F2F0A200080-1-2 7. Mar.2017.Rev.009 © 2012 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (4) DCDC driver (PWM comparator, frequency hopping, slope compensation, OSC, burst) BM2PXX4F is current mode PWM control. An internal oscillator sets a fixed switching frequency (65kHz typ). BM2PXX4F is integrated switching frequency hopping function which changes the switching frequency to fluctuate as shown in Figure 10 below. The fluctuation cycle is 125 Hz typ. 65 Switching Frequency [kHz] 69 125 Hz(8ms) Time 61 62 63 64 66 68 67 500us Figure 10. Frequency hopping function Max duty cycle is fixed as 75% (typ) and MIN pulse width is fixed as 400 ns (typ). With current mode control, when the duty cycle exceeds 50% sub harmonic oscillation may occur. As a countermeasure to this, BM2PXX4F is built in slope compensation circuits. BM2PXX4F is built in burst mode circuit and frequency reduction circuit to achieve lower power consumption, when the load is light. FB pin is pull up by RFB (30 kΩ typ). FB pin voltage is changed by secondary output voltage (secondary load power). FB pin is monitored, burst mode operation and frequency detection start. Figure 12 shows the FB voltage, and switching frequency, DCDC operation ・ mode1: Burst operation ・ mode2: Frequency reduction operation. ・ mode3: Fixed frequency operation. (operate at the max frequency) ・ mode4: Over load operation. (detect the over load state and stop the pulse operation) Figure 11. Switching operation state changes by FB pin voltage |
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