參數(shù)資料
型號(hào)： SC4808B-2MSTRT
廠商： Semtech Corporation
英文描述： High Performance Dual Ended PWM Controller
中文描述： 高性能雙端PWM控制器
文件頁(yè)數(shù)： 13/28頁(yè)
文件大?。?/td> 453K
代理商： SC4808B-2MSTRT
13
2006 Semtech Corp.
www.semtech.com
SC4808B-2
POWER MANAGEMENT
Application Information (Cont.)
It should be noted that if high speed/high current drivers
such as the SC1301 are used, careful layout guide lines
must be followed in order to minimize stray inductance,
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,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
SC4808B-2. 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.
相關(guān)PDF資料
PDF描述
SC4808C High Performance Dual Ended PWM Controller
SC4808CMSTRT High Performance Dual Ended PWM Controller
SC4809A High Performance Current Mode PWM Controller
SC4809B High Performance Current Mode PWM Controller
SC4809C High Performance Current Mode PWM Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC4808BIMS.TR 制造商:Semtech Corporation 功能描述:
SC4808BIMSTR 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:High Performance Dual Ended PWM Controller
SC4808BIMSTRT 制造商:Semtech Corporation 功能描述: 制造商:Semtech Corporation 功能描述:SC Series 20 mA 550 kHz SMT High Performance Dual Ended PWM Controller - MSOP-10
SC4808C 制造商:SEMTECH 制造商全稱(chēng):Semtech Corporation 功能描述:High Performance Dual Ended PWM Controller
SC4808CMSTRT 制造商:Semtech Corporation 功能描述:SC Series 20 mA 550 kHz SMT High Performance Dual Ended PWM Controller - MSOP-10
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