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부품번호 | SD4843 기능 |
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기능 | (SD4840 - SD4844) Current Mode PWM Controller | ||
제조업체 | Silan Microelectronics | ||
로고 | |||
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
SD4840/4841/4842/4843/4844
Characteristics
Symbol
Test conditions
Min.
SD4840P67K65
--
Reverse
Transfer
Capacitance
SD4841P67K65
SD4842P67K65
SD4843P67K65
Crss VGS=0V, VDS=25V, f=1MHz
--
--
--
SD4844P67K65
--
SD4840P67K65
--
Turn On Delay
Time
SD4841P67K65
SD4842P67K65
SD4843P67K65
td(ON) VDD=0.5BVDSS, ID=25mA
--
--
--
SD4844P67K65
--
SD4840P67K65
--
Rise Time
SD4841P67K65
SD4842P67K65
tr VDD=0.5BVDSS, ID=25mA
--
--
SD4843P67K65
--
SD4844P67K65
--
SD4840P67K65
--
Turn Off Delay
Time
SD4841P67K65
SD4842P67K65
SD4843P67K65
td(OFF) VDD=0.5BVDSS, ID=25mA
--
--
--
SD4844P67K65
--
SD4840P67K65
--
Fall Time
SD4841P67K65
SD4842P67K65
tf VDD=0.5BVDSS, ID=25mA
--
--
SD4843P67K65
--
SD4844P67K65
--
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ELECTRICAL CHARACTERISTICS (unless otherwise specified, Tamb=25°c)
Characteristics
Undervoltage Section
Start Threshold Voltage
Stop Threshold Voltage
Oscillator Section
Oscillate Frequency
Frequency Jitter
Frequency Change With
Temperature
Maximum Duty Cycle
Feedback Section
Feedback Source Current
Shutdown Feedback Voltage
Shutdown Delay Current
Symbol
Test conditions
Vstart
Vstop
FOSC
FMOD
-- 25°C≤Tamb≤+85°C
Dmax
IFB
VSD
Idelay
0V≤VFB≤3V
5V≤VFB≤VSD
Min.
11
7
61
±1.5
--
72
0.7
5.5
3.5
Typ.
8
10
17
30
40
10
12
20
33
40
3
4
15
19
25
27
30
55
70
90
8
10
25
32
42
Typ.
12
8
67
±2.0
±5
77
0.9
6.0
5.0
Max.
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
Max.
13
9
73
±2.5
±10
82
1.1
6.5
6.5
Unit
pF
nS
nS
nS
nS
Unit
V
V
KHz
KHz
%
%
mA
V
μA
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2 2008.12.17
Page 4 of 11
4페이지 SD4840/4841/4842/4843/4844
3. Frequency Jitter
The oscillation frequency is kept changed for low EMI and decreasing radiation on one frequency. The oscillation
frequency changes within a very small range to simplify EMI design. The rule of frequency changing: change
from 65KHz to 69KHz.
4. Light Load Mode
Working in this mode to reduce power dissipation. It works normally when FB is 500mV above and during
350mV<FB <500mV, there are two different conditions: when FB changes from low to high, there is no action for
switch and it is the same with condition of FB lower than 350mV; the other is that FB changes form high to low,
comparison value is increased for increasing turning on time to decrease switch loss.
For this mode, during FB changes form high to low, the output voltage increases (increasing speed is decided
by load) because of the high comparison value to decrease FB until it is 350mV below; when FB <350mV, there
is no action for switch and output voltage decrease (decreasing speed is also decided by load) to increase FB.
This is repeated to decrease action of switch for lower power dissipation.
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5. Leading Edge Blanking
For this current-controlled circuit, there is pulse peak current during the transient of switch turning on and there is
an error operation if the current is sampled during this time. And leading edge blanking is adopted to eliminate
this error operation. The output of PWM comparator is used for controlling shutdown after the leading edge
blanking if there is any output drive.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2 2008.12.17
Page 7 of 11
7페이지 | |||
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부품번호 | 상세설명 및 기능 | 제조사 |
SD484-52-05-301 | Photodiode Arrays | ETC |
SD4840 | (SD4840 - SD4844) Current Mode PWM Controller | Silan Microelectronics |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |