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M62215FP Fiches technique(PDF) 6 Page - Renesas Technology Corp

No de pièce M62215FP
Description  General Purpose Multifunction DC/DC Converter
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Fabricant  RENESAS [Renesas Technology Corp]
Site Internet  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

M62215FP Fiches technique(HTML) 6 Page - Renesas Technology Corp

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M62215FP
REJ03D0844-0201 Rev.2.01 Nov 14, 2007
Page 6 of 10
2. Soft Start Function, Maximum ON Duty Setting and Short-circuit Protection
1) Soft start function (Refer to Figure 4 for its application circuit)
When power supply is turned on, FB terminal is fixed to high level since IN1, IN2 are on GND level.
Voltage level of SCP terminal gradually rises up from 0 V, because the internal charge current and the current
flowing from the resistors dividing VREF are charged to CSCP.
When SCP terminal voltage reaches to the lower limit voltage of triangular waveform, output starts to operate
making DC/DC converter output voltage VO rise up.
Soft start time is calculated by the following equation, (Internal charge current is designed as approx. 20
µA)
VSCP =
(R1
+ R2)
5
• R2 + 20 µA • R1 • R2 −
(R1
+ R2)
5
• R2 + 20 µA • R1 • R2 • e
t
C
• R1 • R2
(R1
+ R2)
Note:
VSCP in this case is the voltage when output starts to operate. (equal to lower limit voltage of triangular
waveform)
VREF
SCP (SOFT)
R1
R2
CSCP
Figure 4
Soft start time
ON
FB
OSC
0 V
OFF
Drain voltage of
external MOSFET
SCP
1.5 V
3.5 V
Figure 5


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