BD9775FV-E2 Rohm Semiconductor, BD9775FV-E2 Datasheet - Page 24

• 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

4)Setting the Time for Short Circuit Protection
5)Single Channel Operation
6)Setting the Oscillating Frequency
1000
100
10
The time (tscp) from output short to latch activation is determined by the capacitor, Cscp, connected SCP pin.
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).
10
Short SCP to GND if SCP function is not being used.
C
CT
=1000pF
DTC,FB,CTL,CL
VS,PVCC
INV
Ocsillating Frequency vs. Timing Capacitance (CCT)
C
CT
=470pF
Timing Resistance (kΩ)
tscp ＝ 7.96 × 10
Fig.3
C
CT
=100pF
100
5
× Cscp
Without SCP
Single Channel Operation
PVCC
DTC
CTL
INV
SCP
FB
CL
VS
[sec]
Short to VCC
Short to GND
Short to VREF
1000
24/29
（ typ. ）
1000
100
10
100
VCC
VREF
R
RT
=100kΩ
Ocsillating Frequency vs. Timing Capacitance (RRT)
R
RT
=27kΩ
R
RT
=5.1kΩ
Timing Capacitance(pF)
Fig.4
1000
10000