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UC3842B Datasheet(PDF) 3 Page - Unisonic Technologies

Part No. UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3842B Datasheet(HTML) 3 Page - Unisonic Technologies

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UTCUC3842B/3843B LINEARINTEGRATEDCIRCUIT
UTC UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R103-012,A
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Maximum Current Sense Input
Threshold
Vth
(note 3)
0.9
1.0
1.1
V
Power Supply Rejection Ratio
PSRR
12<=Vcc<=25V (note 3)
70
dB
Input Bias Current
IIB
-2
-10
µA
Propagation Delay
tPLH(In/O
ut)
Current Sense Input to Output
150
300
ns
Output Section
Output Low Voltage
VOL
Isink=20mA
0.1
0.4
V
Isink=200mA
1.6
2.2
V
Output High Level
VOH
Isource=20mA
13
13.5
V
Isource=200mA
12
13.4
V
Output Voltage with UVLO
Activated
VOL
(UVLO)
Vcc=6.0V,Isink=1.0mA
0.1
1.1
V
Output Voltage Rise Time
tr
Tj=25
°C,CL=1nF
50
150
ns
Output Voltage Fall Time
tf
Tj=25
°C,CL=1nF
50
150
ns
Under-Voltage Lockout Section
Startup Threshold
Vth
UTC UC3842B
14.5
16
17.5
V
UTC UC3843B
7.8
8.4
9
V
Min. Operating Voltage After
Turn-on(Vcc)
VCC(min)
UTC3842B
8.5
10
11.5
V
UTC3843B
7.0
7.6
8.2
V
PWM Section
Maximum Duty Cycle
DC(MAX)
94
96
%
Minimum Duty Cycle
DC(MIN)
0
%
Total Device
Power Startup Supply Current
Icc+Ic
Vcc=6.5V for UC3843B
Vcc=14V for UC3842B
0.3
0.5
mA
Power Operating Supply Current
Icc+Ic
Note2
12
17
mA
Power Supply Zener Voltage
Vz
Icc=25mA
30
36
V
Note 1:Maximum Package power dissipation limits must be observed.
Note 2:Adject Vcc above the Startup threshold before setting to 15V.
Note 3:This parameter is measured at the latch trip point with VFB=0V.
Note 4:Comparator gain is defined as :
∆V Output Compensation
AV
∆V Current Sense Input


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