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3843CM の電気的特性と機能

3843CMのメーカーはBCD Semiconductorです、この部品の機能は「CURRENT MODE PWM CONTROLLER」です。


製品の詳細 ( Datasheet PDF )

部品番号 3843CM
部品説明 CURRENT MODE PWM CONTROLLER
メーカ BCD Semiconductor
ロゴ BCD Semiconductor ロゴ 




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3843CM Datasheet, 3843CM PDF,ピン配置, 機能
CURRENT MODE PWM CONTROLLER
General Description
Features
Data Sheet
AP384XC
The AP3842C/3C/4C/5C are high performance fixed
frequency current-mode PWM controller series.
These integrated circuits are optimized for off-line and
DC-DC converter applications with minimum external
www.DataSheet4U.ccoommponents. They feature under-voltage lockout
(UVLO) circuit with low start-up current, trimmed
oscillator for precise duty cycle control, current sense
comparator providing maximum current limiting and a
totem pole output stage for increasing output current.
In addition, these ICs also feature accurate protection
against over-temperature, over-current and maximal
output power.
The AP3842C and AP3844C have UVLO thresholds
of 16V(on) and 10V(off); The corresponding thresh-
olds for AP3843C and AP3845C are 8.4 V(on) and
7.6V(off).
· Low Start-up Current: 50µA
· Robust VREF Line/Load Regulation
Low Line Regulation : 4mV
Low Load Regulation : 4mV
· High Stability of Reference Voltage over a Full
Temperature Range: 0.2mV/ oC
· Operating Frequency up to 500KHz
· High PWM Frequency Stability over a Full Tem-
perature Range: 2.5%
· High PWM Frequency Stability under a Full Sup-
ply Voltage Range: 0.2%
· Accurate Over-temperature Protection with Hys-
teresis
· UVLO with Hysteresis
Applications
The AP3842C and AP3843C can operate approaching · Off-line Converter
100% duty cycle; AP3844C and AP3845C can operate · DC-DC Converter
from zero to 50% duty cycle.
· Voltage Adapter
· CRT Monitor Power Supply
These ICs are available in SOIC-8 and DIP-8 pack- · Desktop Power Supply
ages.
· DVD/STB Power Supply
SOIC-8
DIP-8
Sep. 2006 Rev. 1. 1
Figure 1. Package Types of AP3842C/3C/4C/5C
BCD Semiconductor Manufacturing Limited
1

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3843CM pdf, ピン配列
CURRENT MODE PWM CONTROLLER
Functional Block Diagram
Data Sheet
AP384XC
VCC 7
GND
www.DataSheet4U.com
5
RT/CT 4
VFB
COMP
ISENSE
2
1
3
34V
2.50V
OSC
ERROR
AMP
UVLO
S/R
5V
REF
INTERNAL
BIAS
8 VREF
VREF
GOOD
LOGIC
T
OUTPUT
6
OVER TEMP
PROTECT
2R
R 1V
(Note)
S
R
CURRENT
SENSE
COMPARATOR
PWN
LATCH
Note: Toggle flip-flop used
for 3844C/45C only
Figure 3. Functional Block Diagram of AP3842C/3C/4C/5C
Sep. 2006 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
3


3Pages


3843CM 電子部品, 半導体
Data Sheet
CURRENT MODE PWM CONTROLLER
AP384XC
Electrical Characteristics
(VCC=15V, RT=10kCT=3.3nF, TA= -40 to 85oC, unless otherwise specified.)
Parameter
Symbol
Conditions
Min Typ Max Unit
REFERENCE SECTION
Reference Output Voltage
Total Output Variation
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Line Regulation
Load Regulation
Short Circuit Output Current
Temperature Stability
OSCILLATOR SECTION
VREF
VREF
VREF
ISC
TJ=25oC, IREF=1mA
Line, Load, Temp.
12V VCC 25V
1mA IREF 20mA
TA=25oC
4.90 5.00 5.10
V
4.82 5.18 V
4 15 mV
4 15 mV
-100 -180 mA
0.2 0.4 mV/oC
Oscillation Frequency
Oscillator Amplitude
Temperature Stability
Voltage Stability
Discharge Current
f
VOSC
TJ=25oC
Pin 4, peak to peak (Note 6)
(Note 6)
12V VCC 25V
Vpin 4 =2V(Note 7)
47 52 57 KHz
1.7 V
2.5 %
0.2 1
%
8.5 9.5 10.5 mA
ERROR AMPLIFIER SECTION
Input Voltage
Output Sink Current
Output Source Current
High Output Voltage
Low Output Voltage
Voltage Gain
Power Supply Rejection Ratio
CURRENT SENSE SECTION
VI
ISINK
ISOURCE
VOH
VOL
PSRR
Vpin 1=2.5V
Vpin1=1.1V
Vpin1=5V
RL=15kto GND
RL=15kto pin 8
2V VO 4V
12V VCC 25V
2.45 2.50 2.55
V
58
mA
-0.5 -0.8
mA
57
V
0.7 1.1
V
65 90
dB
60 70
dB
Maximum Input Signal
Gain
VI(MAX) Vpin1=5V(Note 4)
GV (Note 4, 5)
0.9 1 1.1 V
2.85 3 3.15 V/V
Power Supply Rejection Ratio
Delay to Output
PSRR
12V VCC 25V (Note 4, 6)
Vpin3 = 0 to 2V (Note 6)
70 dB
150 300
ns
Input Bias Current
OUTPUT SECTION
IBIAS
-3 -10 µA
Low Output Voltage
High Output Voltage
Rise Time
Fall Time
Sep. 2006 Rev. 1. 1
VOL
VOH
ISINK = 20mA
ISINK = 200mA
ISOURCE = 20mA
ISOURCE = 200mA
0.1 0.4
V
1.4 2.2
V
13 14
V
12 13
V
tR TJ=25oC, CL=1nF (Note 6)
tF TJ=25oC, CL=1nF (Note 6)
50 150 ns
50 150 ns
BCD Semiconductor Manufacturing Limited
6

6 Page



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共有リンク

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部品番号部品説明メーカ
3843CM

CURRENT MODE PWM CONTROLLER

BCD Semiconductor
BCD Semiconductor


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