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UC3844A датащи(PDF) 3 Page - First Components International

номер детали UC3844A
подробное описание детали  High Performance Current Mode Controller
Download  6 Pages
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производитель  FCI [First Components International]
домашняя страница  http://www.cotra.com.tw/
Logo FCI - First Components International

UC3844A датащи(HTML) 3 Page - First Components International

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ELECTRICAL CHARACTERISTICS
Item
Symbol
Min
Typ
Max
Unit
Voltage Feedback Input (VO = 2.5V)
VFB
2.42
2.5
2.58
V
Input Bias Current (VFB = 2.7V)
IIB
---
-0.1
-2.0
µA
Open Loop Voltage Gain (VO = 2.0V to 4.0V)
AVOL
65
90
---
dB
Unity Gain Bandwidth (TJ = 25oC)
BW
0.7
1.0
---
MHz
Power Supply Rejection Ratio (VCC = 12V to 25V)
PSRR
60
70
---
dB
Output Current
mA
Sink (VO = 1.1V, VFB = 2.7V)
ISink
2.0
12
---
Source (VO = 5.0V, VFB = 2.3V)
ISource
-0.5
-1.0
---
Output Voltage Swing
V
High State (RL = 15k to GND, VFB = 2.3V)
VOH
5.0
6.2
---
Low State (RL = 15k to VREF, VFB = 2.3V)
VOL
---
0.8
1.1
ERRORAMPLIFIERSECTION
UC3844A High Performance
Current Mode Controller
Current Sense Input Voltage Gain (Notes 4 & 5)
AV
2.85
3.0
3.15
V/V
Maximum Current Sense Input Threshold (Note 4)
VTH
0.9
1.0
1.1
V
Power Supply Rejection Ratio (VCC = 12V to 25V)
PSRR
---
70
---
dB
Input Bias Current
IIB
---
-2.0
-10
µA
Propagation Delay (Current Sense Input to Output) tPLH(in/out)
---
150
300
ns
CURRENTSENSESECTION
Output Voltage
V
Low State
(ISink = 20mA)
VOL
---
0.1
0.4
(ISink = 200mA)
---
1.6
2.2
High State
(ISink = 20mA)
VOH
13
13.5
---
(ISink = 200mA)
12
13.4
---
Output Voltage with UVLO Activated
VOL(UVLO)
V
(VCC = 6.0V, ISink = 1.0mA)
---
0.1
1.1
Output Voltage Rise Time (CL = 1.0nF, TJ = 25oC)
tr
---
50
150
ns
Output Voltage Fall Time (CL = 1.0nF, TJ = 25oC)
tf
---
50
150
ns
OUTPUTSECTION
Startup Threshold
Vth
14.5
16
17.5
V
Minimum Operating Voltage After Turn-On
VCC(min)
8.5
10
11.5
V
UNDERVOLTAGELOCKOUTSECTION
Duty Cycle
Max.
DCmax
47
48
50
%
Min.
DCmin
---
---
0
PWMSECTION
Power Supply Current (VCC = 14V) (Note 2)
ICC
mA
Startup
---
0.17
0.3
Operating
---
12
17
Power Supply Zener Voltage
VZ
30
36
---
V
TOTALDEVICE
4-26


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