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A5974D データシート(PDF) 40 Page - STMicroelectronics

部品番号 A5974D
部品情報  Zero load current operation
PDF  46 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A5974D データシート(HTML) 40 Page - STMicroelectronics

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Application information
A5974D
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DocID018774 Rev 2
Figure 31. MLCC compensation network circuit
8.12
External SOFT_START network
At the start-up the device can quickly increase the current up to the current limit in order to
charge the output capacitor. If soft ramp up of the output voltage is required, an external
soft-start network can be implemented as shown in Figure 32. The capacitor C is charged
up to an external reference through the R and the BJT clamps the COMP pin.
This clamps the duty cycle, limiting the slew rate of the output voltage.
Figure 32. Soft-start network example
= 4V TO 36V
small signal
power plane
GND
GND
C8
470nF
C8
470nF
COUT
COUT
R6
220K
R6
220K
C11
68nF
C11
68nF
R8
NM
R8
NM
R2
R2
VIN
VIN
C3
C3
C2
68nF
50V
C2
68nF
50V
D1
D1
R5
R5
VOUT
VOUT
C7
C7
GND
GND
C6
C6
R1
R1
VOUT
1
VCC
8
VREF
6
EX-PAD
9
INH
3
COMP
4
GND
7
FB
5
SYNC
2
R4
R4
C5
C5
C1
10uF
50V
C1
10uF
50V
L1
L1
Q1
BC327
Q1
BC327
=4V TO 36V
small signal
power plane
TP3
GND
TP3
GND
D1
D1
Q1
BC327
Q1
BC327
R2
220K
R2
220K
TP1
VIN
TP1
VIN
C2
C2
TP2
VOUT
TP2
VOUT
C3
C3
C4
470nF
C4
470nF
TP4
GND
TP4
GND
VOUT
1
VCC
8
VREF
6
EX-PAD
9
INH
3
COMP
4
GND
7
FB
5
SYNC
2
U1
L597xD
U1
L597xD
L1
L1
C5
C5
R3
R3
R1
R1
C1
50V
C1
50V
R4
R4



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