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UC3844 Datasheet(PDF) 5 Page - Unisonic Technologies

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Maker  UTC [Unisonic Technologies]
Homepage  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3844 Datasheet(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,C
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
ISINK=20mA
0.1
0.4
Low
VOL
ISINK=200mA
1.6
2.2
V
ISINK=20mA
13
13.5
Output Voltage
High
VOH
ISINK=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
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
UC3844
14.5
16.0
17.5
Startup Threshold
UC3845
VTHR
7.8
8.4
9.0
V
UC3844
8.5
10.0
11.5
Minimum Operating
Voltage After Turn-On
UC3845
VCC(MIN)
7.0
7.6
8.2
V
PWM SECTION
Max
DCMAX
47
48
50
%
Duty Cycle
Min
DCMIN
0
%
TOTAL DEVICE
Power Supply Zener Voltage
VZ
ICC=25mA
30
36
-
V
UC3845
VCC=6.5V
0.5
1.0
Power Supply Current
(Note 4)
UC3844
ICC
VCC=14V
12
17
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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