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UC3844 데이터시트(PDF) 4 Page - E-Tech Electronics LTD

부품명 UC3844
상세설명  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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제조업체  ETL [E-Tech Electronics LTD]
홈페이지  http://e-tech.com.hk
Logo ETL - E-Tech Electronics LTD

UC3844 데이터시트(HTML) 4 Page - E-Tech Electronics LTD

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UC3844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
4 of 6
www.unisonic.com.tw
QW-R103-010.E
ELECTRICAL CHARACTERISTICS(Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
CURRENT SENSE SECTION
Current Sense Input Voltage Gain
(Note 2, 3)
GV
2.85
3.0
3.15
V/V
Maximum Current Sense Input
Threshold (Note 2)
VI(THR)
0.9
1.0
1.1
V
Input Bias Current
II(BIAS)
-2.0
-10
μA
Power Supply Rejection Ratio
PSRR
VCC=12V ~ 25V (Note4)
70
dB
Propagation Delay
tPLH(IN/OUT)
150
300
ns
OUTPUT SECTION
Output Voltage
Low
VOL
ISINK=20mA
0.1
0.4
V
ISINK=200mA
1.6
2.2
High
VOH
ISINK=20mA
13
13.5
V
ISINK=200mA
12
13.4
Output Voltage with UVLO Activated
VOL(UVLO)
VCC=6.0V, ISINK=1.0mA
0.1
1.1
V
Output Voltage Rise Time
tR
CL=1.0nF,TJ=25°C
50
150
ns
Output Voltage Fall Time
tF
CL=1.0nF,TJ=25°C
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UC3844
VTHR
14.5
16.0
17.5
V
UC3845
7.8
8.4
9.0
Minimum Operating
Voltage After Turn-On
UC3844
VCC(MIN)
8.5
10.0
11.5
V
UC3845
7.0
7.6
8.2
PWM SECTION
Duty Cycle
Max
DCMAX
47
48
50
%
Min
DCMIN
0
%
TOTAL DEVICE
Power Supply Zener Voltage
VZ
ICC=25mA
30
36
-
V
Power Supply Current
(Note 4)
UC3845
ICC
VCC=6.5V
0.5
1.0
mA
UC3844
VCC=14V
12
17
Startup Current
ISTART-UP
VCC=14V, UVLO Active
0.3
0.5
mA
Note: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient
as possible.
2. This parameter is measured at the latch trip point with VFB=0V.
3. Comparator gain is defined as:
ΔV Output Compensation
AV=
ΔV Current Sense Input
4. Adjust VCC above the startup threshold before setting to 15V.


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