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PDF SD4841 Data sheet ( Hoja de datos )

Número de pieza SD4841
Descripción (SD4840 - SD4844) Current Mode PWM Controller
Fabricantes Silan Microelectronics 
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SD4841 Hoja de datos, Descripción, Manual
SD4840/4841/4842/4843/4844
CURRENT MODE PWM CONTROLLER WITH BUILT-IN HIGH VOLTAGE
MOSFET
DESCRIPTION
SD4840/4841/4842/4843/4844 is a current mode PWM controller
with low standby power and low start current for power switch. In
standby mode, the circuit enters burst mode to reduce the standby
power dissipation.
The switch frequency is 67KHz with ±2.5 KHz jitter frequency for
low EMI.
The stress on transformer during power on is reduced by the built-
in 15ms soft start circuit to avoid the saturation of transformer.
SD4840/4841/4842/4843/4844 includes under voltage lock-out,
over voltage protection, leading edge blanking, over current
protection and the temperature protection. The circuit will restart
automatically until the system is normal after the protection is
active.
FEATURES
* Lower start-up current (Typ.6μA)
* Frequency jitter for low EMI
* Overcurrent protection
* Overvoltage protection
* Undervoltage lockout
* Built-in temperature protection
* Built-in high voltage MOSFET
www.DataShee*t4AUu.ctoomrestart mode
* Built-in soft start
* Burst mode operation
* Cycle by cycle current limit
APPLICATIONS
* Switch power
ORDERING INFORMATION
Part No.
Package
Marking
SD4840P67K65
SD4840P67K65
SD4841P67K65
SD4841P67K65
SD4842P67K65
DIP-8-300-2.54
SD4842P67K65
SD4843P67K65
SD4843P67K65
SD4844P67K65
SD4844P67K65
Note: P denotes it is available in DIP8 package, 67k denotes 67KHz, and 65 denotes withstand voltage is 650V.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2 2008.12.17
Page 1 of 11

1 page

SD4841 pdf
SD4840/4841/4842/4843/4844
Characteristics
Built-in Soft Start Time
Current Limit
SD4840P67K65
Peak Current
Limit
SD4841P67K65
SD4842P67K65
SD4843P67K65
SD4844P67K65
Burst mode
Burst Mode High Voltage
Burst Mode Low Voltage
Protection Section
Overvoltage Protection
Thermal Shutdown
Leading-edge Blanking Time
Total Standby Current
Start Current
Supply Current (Control Part)
Symbol
Test conditions
ts VFB=4V
Iover Max. inductor current
VBURH
VBURL
Vovp
Tsd
TLEB
Istart
Iop
VCC=11V
VCC=12V
PIN CONFIGURATION
Min.
10
Typ.
15
Max.
20
Unit
ms
0.53 0.60 0.67
0.67 0.75 0.83
0.80 0.90 1.00
1.10 1.20 1.30
1.35 1.50 1.65
A
0.4 0.5 0.6
0.25 0.35 0.45
V
V
18 19
125 140
200 --
--
--
--
V
°C
ns
-- 6 20 μA
1 3 5 mA
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PIN DESCRIPTION
Pin No.
1
2
3
4
5
6,7,8
Pin Name
SGND
PGND
VCC
FB
NC
Drain
I/O Function description
- Ground for control part.
- MOSFET Ground.
- Power supply pin.
I/O Feedback input pin.
- Not connected.
O Drain pins.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2 2008.12.17
Page 5 of 11

5 Page

SD4841 arduino
SD4840/4841/4842/4843/4844
Attachment
Revision History
Data
2008.07.07
2008.11.06
2008.12.17
REV
1.0
1.1
1.2
Description
Original
Modify the “BLOCK DIAGRAM” and “FUNCTION DESCRIPTION”
Add the note for “TYPICAL APPLICATION CIRCUIT”
Page
www.DataSheet4U.com
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2 2008.12.17
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