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What is SD4841?

This electronic component, produced by the manufacturer "Silan Microelectronics", performs the same function as "Current Mode PWM Controller - DIP 8".


SD4841 Datasheet PDF - Silan Microelectronics

Part Number SD4841
Description Current Mode PWM Controller - DIP 8
Manufacturers Silan Microelectronics 
Logo Silan Microelectronics Logo 

A current mode PWM (Pulse Width Modulation) controller is an electronic device used in power electronic circuits to regulate the output voltage of a power supply.

It compares a reference signal to a feedback signal from the output of the power supply and adjusts the duty cycle of the PWM signal sent to a power switch to maintain the desired output voltage.

The main advantage of current mode control over voltage mode control is that it can provide a faster response to changes in the load current, making it more suitable for applications with rapidly changing loads.

It also offers better noise immunity and improved stability over a wider range of operating conditions.


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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

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SD4841 equivalent
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
www.DataSheet4U.com
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


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On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for SD4841 electronic component.


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1. SD4844) Current Mode PWM Controller

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Featured Datasheets

Part NumberDescriptionMFRS
SD484-52-05-301The function is Photodiode Arrays. ETCETC
SD4840The function is (SD4840 - SD4844) Current Mode PWM Controller. Silan MicroelectronicsSilan Microelectronics
SD4841The function is Current Mode PWM Controller - DIP 8. Silan MicroelectronicsSilan Microelectronics

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