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PDF SC4911 Data sheet ( Hoja de datos )
| Número de pieza | SC4911 | |
| Descripción | Bias/Primary Side PWM Controller | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC4911 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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POWER MANAGEMENT
Description
SC4911
Bias/Primary Side PWM Controller
with Ultra Low Start-up Current
Features
The SC4911 is a highly integrated bias/primary side PWM
controller designed for off-line or isolated dc-dc convert-
ers in telecommunication and data communication ap-
plications. The high degree of integration minimizes the
amount of discrete parts needed and leads to substan-
tial cost and space saving converter designs.
The circuitry of the SC4911 includes line voltage UVLO
www.DatafSehaeteut4rUin.cgomstartup current less than 50µA and program-
mable switching frequency. The device supply is derived
from an auxiliary winding on the transformer. The auxil-
iary winding could also provide output feedback informa-
tion if an optocoupler is not used.
Programmable switching frequency up to 500kHz
Line UVLO Protection
Undervoltage Lockout
Low startup current (45µA)
Cycle by cycle current limit
8 pin MSOP. Available in Lead-free, fully WEEE and
RoHS compliant
Applications
Telecom isolated converters
Offline isolated power supplies
Instrumentation power supplies
Battery chargers
Typical Application Circuit
D1
R1 C1
Vin
C3 R2
C5 R4
R5
C4
U1 SC4911
R3
C6
T1
D2
Vout
C2
3 FB
OUT 7
Q1
4 COMP
ILIM 5
R6
R7 C7
C8 R8
R9
Revision: April 5, 2006
1
www.semtech.com
1 page  
POWER MANAGEMENT
Block Diagram
Vcc
RT
L-Uvlo
Startup
&
Uvlo Comp
Oscillator
www.DataSheet4U.com
FB
Comp
ILIM
Gnd
BandGap
+
-
Error Amplifier
+
-
PWM Comparator
IlimComparator
Vt
0 .05.V525V
OR gate
PWM Latch
SC4911
Logic
Output
Driver
Out
2006 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Evaluation Board Schematic
SC4911
J3
Vb=12V
1
2
J2
Vin=48V
1
2
C4
10uF/100V
www.DataSheet4U.com
R5
383K
R8
100K
C6
470pF
D1 T1
1N5819HW 2 31414R
D3
1N5819HW
C1
47uF
D2 B150
15
R2
2.7MEG
R1
100K
3
R3
68 4
8
R4
100K
C5
10uF
C7
150pF/100V
1 8 U1 SC4911
LUVLO VCC
3 FB
OUT 7
R6
0
Q1
Si2320DS
4 COMP
ILIM 5
C10
470pF
C8
47nF
R10
4.99K
RT GND
26
R11
100K
R7
51
C9
1000pF
R9
1.00
C2
47uF
C3
47uF
J1
1 Vo=12V
2
2006 Semtech Corp.
11
www.semtech.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SC4911.PDF ] | |
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