- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄374731 > SC4810BITSTRT (Semtech Corporation) High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay PDF資料下載
參數(shù)資料
| 型號(hào)： | SC4810BITSTRT |
| 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)： | 9/24頁 |
| 文件大?。?/td> | 374K |
| 代理商： | SC4810BITSTRT |
9
2006 Semtech Corp.
www.semtech.com
SC4810B/E
POWER MANAGEMENT
Application Information
Introduction
The SC4810B/E is a 16 pin BICMOS peak current mode
controlled PWM controller for isolated DC-DC and off-
line switching power supplies. It features a high switching
frequency of operation, programmable limits for both
power transformer voltage-second product and maximum
PWM duty cycle, line under-voltage lockout, auxiliary switch
activation complementary to main power switch drive,
programmable leading-edge delay time between
activation of each switch, multiple protection features
with programmable cycle -by-cycle current limit and hiccup
mode over-current protection plus soft-restart. It
operates in a fixed frequency programmed by external
components. The separate sync pin simplifies
synchronization to an external clock. Feeding the oscillator
of one device to the sync of another forces biphase
operation which reduces input ripple and input and output
filter size.
The SC4810 can be applied in an active clamp forward
topology with the input voltage ranging from 36V to 72V.
This topology allows the converter to achieve an efficiency
of 92.4% at normal input voltage of 48V.
Circuit Description
The schematic of the active clamp forward converter is
illustrated in Figure. 1 below. T4 is the power transformer.
M17 is the N-channel main switching MOSFET and M15
is the auxiliary N-channel MOSFET. C35 is the reset
capacitor for resetting the power transformer’s core. M14
and M16 construct the synchronous rectification circuit.
L2 and C32 and C33 construct the low-pass output
filtering circuit. T6 is the current sensing transformer. R62
is the reset resistor for resetting the magnetic core of
the current sensing transformer. D18 is the rectifying
diode. R63 is the current sensing resistor. R60 and C41
construct the low-pass filtering circuit for the sensed
current signal. The primary bias circuit consists of R55,
R58, D17, Q8, C40, C31, D14 and R51. R55 and R58
construct a voltage divider, which limits the bias voltage
to 6.9V until the line voltage reach 36V. D17 is a zener
diode that limits the bias voltage to under 8V. R51, D14
and C31 construct the peak charge circuit. The peak
charge circuit will provide bias to the PWM IC U9 (SC4810)
and the driver U8 (SC1302A) after the converter starts
Figure 1: Active Clamp Forward Converter
R52
10K
R50
5.11
100uF
C32
C35
3300pF
R78
5.6K
C40
10uF
3.3V/30A
R70
open
C31
0.1uF
C46
open
C43
100pF
R74
4.3K
R77
18K
D16
open
R53
10K
M16
Si4842DY
4
5
3
2
1
6
7
8
R80
1.47K
R72
5.11K
L2
1.3uH
R67
50
R64
165k
C47
0.01uF
R76
3.01K
T4
2
4
7
1
6
8
9
10
11
Q9
FMMT718
R62
10K
C49
180pF
R59
10
C44 220pF
C45
open
D17
open
T6
8
7
1
3
R58
8K
Q8
FZT458
R73
3.01K
R66
open
R57
5.11K
D20
1N5819HW
R79
100K
D14
1N4148WS
C50
1000pF
D13
1N4148WS
C51
0.01uF
R61
1.1M
D18
1N4148WS
M14
Si4842DY
7
8
4
5
3
2
1
6
R54
20K
U9
SC4810
2
4
11
3
10
1
15
1
5
9
7
6
16
13
8
1
L
RCT
FB
SYNC
CS
P
OUT1
V
DMAX
SS
DELAY1
RAMP
VREF
OUT2
DELAY2
G
C42
open
48V
M15
Si4488DY
4
5
3
2
1
6
7
8
C39
0.1uF
C48
0.1uF
R55
30K
R51
5.11
C33
680uF
Q7
FZT458
C41
330pF
R56
10K
R75
100K
U10
SC431
R69
10K
U8
SC1302A
2
7
6
3
1
8
4
5
R68
1K
U11
MOC207
1
7
2
6
5
R65
100K
T5
PE68386
1
3
4
6
M17
Si4488DY
4
5
3
2
1
6
7
8
C36
0.1uF
R63
6.8
1u,100V
C34
C37
0.1uF
R81
4.7K
R71
10K
D19
1N5819HW
R82
5.11K
C38
0.1uF
R60
1K
D15
1N4148WS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC4810E | High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
| SC4810EIMLTRT | High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
| SC4810EITSTRT | High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
| SC4812 | Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp |
| SC4812EVB | Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4810E | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Current Mode PWM Controller with Complementary Output, Programmable Delay |
| SC4810EIMLTRT | 制造商:Semtech Corporation 功能描述:Controller IC Leaded Process Compatible: |
| SC4810EITSTRT | 制造商:Semtech Corporation 功能描述:Controller IC |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。