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參數(shù)資料
| 型號： | SC4901 |
| 廠商： | Semtech Corporation |
| 英文描述： | COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator |
| 中文描述： | 客貨兩用，同步二次側(cè)同步整流和穩(wěn)壓器 |
| 文件頁數(shù)： | 12/20頁 |
| 文件大?。?/td> | 598K |
| 代理商： | SC4901 |
12
2005 Semtech Corp.
www.semtech.com
SC4901
POWER MANAGEMENT
Application Information (Cont.)
Fig 3b. Driving the Pulse Transformer with > 50% duty ratio using using a series capacitor
Fig 3c. Driving a Pulse Transformer with > 50% duty ratio using using a zener for reset
PGND
DRES
DTO
RGS
RG
TRANSFORMER DESIGN
IS ON
WITH D RES AS SHOWN
DURING THE OFF PERIOD
DUTY RATIO
XFRA PIN IS PROVIDED TO
SIMPLIFY PULSE
XFRA IS AN OPEN COLLECTOR
THAT TURNS ON WHEN OUTA
FOR OPERATING DUTY RATIOS
OF > 50% A ZENER MAY BE
ADDED IN REVERSE SERIES
XFRA PIN WILL BE STRESSED
TO PVCC + ZENER VOLTAGE
GATE VOLTAGE WILL ALWAYS
BE EQUAL TO PVCC DURING
ON TIME IRRESPECTIVE OF
Sense
Current
QR
QF
CT
C
L
ZCD
15
CAO
3
CS-
2
CS+
1
OUTB
6
SSEN
4
XFRA
7
PVCC
9
PGND
8
VCC
5
GND
16
OUTA
10
REF
11
VEA-
12
VEA
13
RCT
14
P W M L O G I C
A N D
O U T P U T
D R I V E R S
TRANSFORMER
SECONDARY
SYNC AND RAMP
+
+
-
-
QS
DVCC
COUT
RT
RZ
PVCC
G
T
VOUT
VSEC
RTN
SC4901
CONVERTOR
SINGLE
ENDED
FORWARD
C SS
XFRA
O
Z RES
OPTIONAL
PGND
DRES
DTO
RGS
RG
TRANSFORMER DESIGN
ON WHEN OUTA IS ON
TRANSFORMER
OFF TIME.
WHEN D > 50%
XFRA PIN IS PROVIDED TO
SIMPLIFY PULSE
XFRA IS AN OPEN
COLLECTOR THAT TURNS
FOR OPERATING DUTY
RATIOS OF > 50% A
CAPACITOR CAN BE
CONNECTED IN SERIES
WITH PULSE
'DRES' AND 'C RES'
TOGETHER RESET THE
PULSE XFR DURING THE
GATE DRIVE VOLTAGE
APPLIED IS REDUCED BY
THE VOLTAGE ACROSS 'C
RES'. THIS HAPENS ONLY
Sense
Current
QR
QF
CT
C
ZCD
15
CAO
3
CS-
2
CS+
1
OUTB
6
SSEN
4
XFRA
7
PVCC
9
PGND
8
VCC
5
GND
16
OUTA
10
REF
11
VEA-
12
VEA
13
RCT
14
P W M L O G I C
A N D
O U T P U T
D R I V E R S
TRANSFORMER
SECONDARY
SYNC AND RAMP
+
+
-
-
L
QS
DVCC
COUT
RT
RZ
PVCC
G
T
VOUT
VSEC
RTN
SC4901
CONVERTOR
SINGLE
ENDED
FORWARD
C SS
XFRA
C RES
OPTIONAL
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SC4901ITSTRT | COMBI-SYNC Secondary Side Synchronous Rectifier and Regulator |
| SC4905A_06 | High Performance Voltage Mode PWM Controller |
| SC4905AIMSTR | High Performance Voltage Mode PWM Controller |
| SC4905AIMSTRT | High Performance Voltage Mode PWM Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SC4901ITSTRT | 制造商:Semtech Corporation 功能描述:Secondary Side PWM Cntrlr SYNC POST REGUL 1MHz 16-Pin TSSOP T/R 制造商:Semtech Corporation 功能描述:Controller IC |
| SC4905A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:HIGH PERFORMANCE VOLTAGE MODE PWM CONTROLLER |
| SC4905A_06 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Performance Voltage Mode PWM Controller |
| SC4905AIMSTR | 制造商:Semtech Corporation 功能描述:IC, VOLTAGE MODE PWM CTRL, 12V, MSOP-10; Input Voltage:48V; Output Voltage:500mV; Output Current:1mA; Supply Voltage Min:0V; Supply Voltage Max:12V; Digital IC Case Style:MSOP; No. of Pins:10; Frequency:1MHz; Control Mode:Voltage ;RoHS Compliant: No |
| SC4905AIMSTRT | 制造商:Semtech Corporation 功能描述:Voltage Mode PWM Controller 10-Pin MSOP T/R |
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