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BD9775FV Datasheet(PDF) 8 Page - Rohm

Part # BD9775FV
Description  High Efficiency Step-down Switching Regulator Controller
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD9775FV Datasheet(HTML) 8 Page - Rohm

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Technical Note
8/14
www.rohm.com
2011.05 - Rev.A
© 2011 ROHM Co., Ltd. All rights reserved.
BD9775FV
4) Setting the Time for Short Circuit Protection
The time (tscp) from output short to latch activation is determined by the capacitor, Cscp, connected SCP pin.
tscp=7.96×10
5×Cscp
[sec]
(typ.)
Short SCP to GND if SCP function is not being used.
Fig.7 Without SCP
5) Single Channel Operation
This device can be used as a single output. The connection is as follows;
DTC, FB, CTL, CL
Short to GND
VS, PVCC
Short to VCC
INV
Short to VREF
Fig.8 Single Channel Operation
6) Setting the Oscillating Frequency
The oscillating frequency can be set by selecting the timing resistor (RRT) and the timing capacitor (CCT).
Fig.9 Oscillating Frequency vs. Timing Capacitance (CCT)
Fig.10 Oscillating Frequency vs. Timing Capacitance (RRT)
SCP
DTC
FB
CTL
CL
VS
PVCC
INV
VREF
VCC
10
100
1000
10
100
1000
Timing Resistance (kΩ)
CCT=470pF
CCT=1000pF
CCT=100pF
10
100
1000
100
1000
10000
Timing Capacitance(pF)
RRT=100kΩ
RRT=27kΩ
RRT=5.1kΩ


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