UC3844A Просмотр технического описания (PDF) - First Components International
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UC3844A Datasheet PDF : 6 Pages
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UC3844A High Performance
Current Mode Controller
ELECTRICAL CHARACTERISTICS
ERROR AMPLIFIER SECTION
Item
Symbol
Voltage Feedback Input (VO = 2.5V)
Input Bias Current (VFB = 2.7V)
Open Loop Voltage Gain (VO = 2.0V to 4.0V)
Unity Gain Bandwidth (TJ = 25oC)
Power Supply Rejection Ratio (VCC = 12V to 25V)
Output Current
VFB
IIB
AVOL
BW
PSRR
Sink (VO = 1.1V, VFB = 2.7V)
Source (VO = 5.0V, VFB = 2.3V)
Output Voltage Swing
ISink
ISource
High State (RL = 15k to GND, VFB = 2.3V)
VOH
Low State (RL = 15k to VREF, VFB = 2.3V)
VOL
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 4 & 5)
AV
Maximum Current Sense Input Threshold (Note 4) VTH
Power Supply Rejection Ratio (VCC = 12V to 25V) PSRR
Input Bias Current
IIB
Propagation Delay (Current Sense Input to Output) tPLH(in/out)
OUTPUT SECTION
Output Voltage
Low State
(ISink = 20mA)
(ISink = 200mA)
High State
(ISink = 20mA)
(ISink = 200mA)
Output Voltage with UVLO Activated
(VCC = 6.0V, ISink = 1.0mA)
Output Voltage Rise Time (CL = 1.0nF, TJ = 25oC)
Output Voltage Fall Time (CL = 1.0nF, TJ = 25oC)
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
Minimum Operating Voltage After Turn-On
VOL
VOH
VOL(UVLO)
tr
tf
Vth
VCC(min)
PWM SECTION
Duty Cycle
Max.
Min.
TOTAL DEVICE
DCmax
DCmin
Power Supply Current (VCC = 14V) (Note 2)
ICC
Startup
Operating
Power Supply Zener Voltage
VZ
Min Typ
2.42 2.5
--- -0.1
65 90
0.7 1.0
60 70
2.0 12
-0.5 -1.0
5.0 6.2
--- 0.8
Max Unit
2.58 V
-2.0 µA
--- dB
--- MHz
--- dB
mA
---
---
V
---
1.1
2.85 3.0 3.15 V/V
0.9 1.0 1.1 V
--- 70 --- dB
--- -2.0 -10 µA
--- 150 300 ns
V
--- 0.1 0.4
--- 1.6 2.2
13 13.5 ---
12 13.4 ---
V
--- 0.1 1.1
--- 50 150 ns
--- 50 150 ns
14.5 16 17.5 V
8.5 10 11.5 V
47 48 50 %
--- --- 0
mA
--- 0.17 0.3
--- 12 17
30 36 --- V
4-26
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