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SC4808BIMSTR датащи(PDF) 16 Page - Semtech Corporation

номер детали SC4808BIMSTR
подробное описание детали  High Performance Dual Ended PWM Controller
PDF  31 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC4808BIMSTR датащи(HTML) 16 Page - Semtech Corporation

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 2005 Semtech Corp.
www.semtech.com
SC4808A/B
POWER MANAGEMENT
which might cause negative voltages at the output of the
drivers. This negative voltage can be clamped to a reason-
able level by placing a small Schottky diode directly at the
output of the driver as shown below.
C34
0.1u
VCC
VCC
U3
SC1301A
1
4
3
2
5
C23
0.1u
EN
U6
SC1301A
1
4
3
2
EN
VCC
R28
10
2.2u,16V
C26
F
D_A
0.1u,25V
C33
R33
10k
SYNC
U4
SC4808
4
5
3
2
10
1
6
7
8
9
FB
REF
CS
RC
LUVLO
SYNC
GND
OUTB
OUTA
VCC
D_B
Gate_A
5
Gate_B
R23
56.2k
Vin
OVER CURRENT
Two levels of over current protection are provided by the
SC4808. The current information is sensed at the CS pin
and compared to a peak current limit level of 525mV. If
the 525mV limit is exceeded, the OUTA and OUTB pulse
widths and duty cycle is reduced until the CS pin reaches a
second threshold of 950mV. At that point, the OUTA and
OUTB are disabled, and after a delay of 140µs, the inter-
nal softstart sequence is started. After the softstart dura-
tion (see page 21 for calculation of softstart time), normal
operation is achieved, unless the over current condition is
still present.
Application Information (Cont.)



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