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UC3844G-S08-R Scheda tecnica(PDF) 5 Page - Unisonic Technologies

Il numero della parte UC3844G-S08-R
Spiegazioni elettronici  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Produttore elettronici  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3844G-S08-R Scheda tecnica(HTML) 5 Page - Unisonic Technologies

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UC3844/45
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
5 of 7
www.unisonic.com.tw
QW-R103-010.H
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 (Note 4)
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
Notes: 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:
V Output Compensation
AV=
V Current Sense Input
4. Adjust VCC above the startup threshold before setting to 15V.


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