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參數(shù)資料
| 型號(hào)： | SC4810E |
| 廠商： | Semtech Corporation |
| 英文描述： | High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
| 中文描述： | 高性能電流模式PWM控制器，帶有互補(bǔ)輸出，可編程延遲 |
| 文件頁數(shù)： | 12/24頁 |
| 文件大?。?/td> | 374K |
| 代理商： | SC4810E |
12
2006 Semtech Corp.
www.semtech.com
SC4810B/E
POWER MANAGEMENT
Application Information (Cont.)
Clock Signal of SC4810
DMAX
Fig. 5 Illustration for DMAX
V
RCT
t
3V
0V
0V
V
DMAX
t
In this application, V
DMAX
was designed to be 2.8V. So the
D
MAX
= 90%.
Limit for Power Transformer
Voltage Second Product
The SC4810 also features programmable limits for power
transformer voltage-second product. As illustrated in Fig.
6 and Fig. 7 RAMP pin is charged up via a resistor R from
the input line voltage. The capacitor C will be discharged
via an internal FET shorted to ground and the output
OUT1 will be pulled low whenever the voltage on RAMP
pin hits 3V. By adjusting the values of the resistor R and
the value of the capacitor C, the maximum voltage-sec-
ond product imposed on the power transformer is pre-
set. The maximum voltage-second product limitation helps
prevent saturation of the power transformer.
Voltage waveform on RAMP pin
Maximum OUT1 of SC4810
Fig. 6 Illustration of the programmable limits for power
transformer voltage-second product
V
RAMP
t
3V
0V
0V
t
OUT1
R
C
RAMP
Fig. 7 Illustration for Maximum voltage-
second product on the power transformer
V
IN
The selection of the R and C should consider the maxi-
mum voltage rating of the main switching FET. In this
application, the voltage rating of SI4488 is 150V. Since
Vin*D/(1-D) = 150V, D = 0.8 for low line 36V. So to get
80% at low line, R = 165kOhms and C = 220pF were
selected using volt-second product equation:
3 Ramp Cramp.
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| SC4810EIMLTRT | 制造商:Semtech Corporation 功能描述:Controller IC Leaded Process Compatible: |
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| SC4812 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp |
| SC4812EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp |
| SC4812STRT | 制造商:Semtech Corporation 功能描述: |
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