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BD8961NV Datasheet(PDF) 8 Page - Rohm

Part # BD8961NV
Description  Synchronous Buck Converter with Integrated FET
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD8961NV Datasheet(HTML) 8 Page - Rohm

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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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