BD9775FV-E2 Rohm Semiconductor, BD9775FV-E2 Datasheet - Page 8

• Manufacturer Part Number: BD9775FV-E2
• Description: IC REG SW STEP DOWN HE 28-SSOP
• Manufacturer: Rohm Semiconductor
• Type: Step-Down (Buck)r

Specifications of BD9775FV-E2

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Current - Output: 400mA
• Frequency - Switching: 100kHz
• Voltage - Input: 6 ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Power - Output: 640mW
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: BD9775FV-E2TR

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