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BD8961NV Datasheet(PDF) 8 Page - Rohm |
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BD8961NV Datasheet(HTML) 8 Page - Rohm |
8 / 25 page 8/21 BD8961NV Datasheet 02.Oct.2014 Rev.002 www.rohm.com TSZ02201-0J3J0AJ00020-1-2 ©2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Application Information 1. Operation BD8961NV is a synchronous step-down switching regulator that achieves fast transient response by employing current mode PWM control system. (1) Synchronous Rectifier Integrated synchronous rectification using two MOSFETs reduces power dissipation and increases efficiency when compared to converters using external diodes. Internal shoot-through current limiting circuit further reduces power dissipation. (2) Current Mode PWM Control PWM control signal of this IC depends on two feedback loops, the voltage feedback and the inductor current feedback. (a) PWM (Pulse Width Modulation) Control The clock signal coming from OSC has a frequency of 1MHz. When OSC sets the RS latch, the P-Channel MOSFET is turned on and the N-Channel MOSFET is turned OFF. The opposite happens when the current comparator (Current Comp) resets the RS latch i.e. the P-Channel MOSFET is turned OFF and the N-Channel MOSFET is turned on. Current Comp's output is a comparison of two signals, the current feedback control signal "SENSE" which is a voltage proportional to the current IL, and the voltage feedback control signal, FB. Figure 18. Diagram of Current Mode PWM Control Figure 19. PWM Switching Timing Chart Current Comp SET RESET SW VOUT PVCC GND GND GND IL(AVE) VOUT(AVE) SENSE FB IL OSC Level Shift Driver Logic R Q S IL SW RITH Current Comp Gm Amp SET RESET FB Load SENSE VOUT VOUT |
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