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UC3842BDG Datasheet(PDF) 4 Page - ON Semiconductor

Part No. UC3842BDG
Description  High Performance Current Mode Controllers
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842BDG Datasheet(HTML) 4 Page - ON Semiconductor

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UC3842B, UC3843B, UC2842B, UC2843B
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 7], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values
TA is the operating ambient temperature range that applies [Note 8], unless otherwise noted.)
UC284XB, UC2843D
UC384XB, XBV
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 5 and 6)
UC2843D, UC284XB, UC384XB
UC384XBV
AV
2.85
3.0
3.15
2.85
2.85
3.0
3.0
3.15
3.25
V/V
Maximum Current Sense Input Threshold (Note 5)
UC2843D, UC284XB, UC384XB
UC384XBV
Vth
0.9
1.0
1.1
0.9
0.85
1.0
1.0
1.1
1.1
V
Power Supply Rejection Ratio (VCC = 12 V to 25 V, Note 5)
PSRR
70
70
dB
Input Bias Current
IIB
− 2.0
−10
− 2.0
−10
mA
Propagation Delay (Current Sense Input to Output)
tPLH(In/Out)
150
300
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
(ISink = 200 mA)
UC284XB, UC384XB
UC384XBV, UC2843D
High State (ISource = 20 mA)
UC284XB, UC384XB
UC384XBV, UC2843D
(ISource = 200 mA)
VOL
VOH
13
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12.9
12
0.1
1.6
1.6
13.5
13.5
13.4
0.4
2.2
2.3
V
Output Voltage with UVLO Activated (VCC = 6.0 V, ISink = 1.0 mA)
VOL(UVLO)
0.1
1.1
0.1
1.1
V
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
tr
50
150
50
150
ns
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
tf
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold (VCC)
UCX842B, BV
UCX843B, BV, D
Vth
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After Turn−On (VCC)
UCX842B, BV
UCX843B, BV, D
VCC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
V
PWM SECTION
Duty Cycle
Maximum UC284XB, UC384XB, UC2843D
Maximum UC384XBV
Minimum
DC(max)
DC(min)
94
96
0
94
93
96
96
0
%
TOTAL DEVICE
Power Supply Current
Startup (VCC = 6.5 V for UCX843B, UC2843D
Startup VCC 14 V for UCX842B, BV)
(Note 7)
ICC + IC
0.3
12
0.5
17
0.3
12
0.5
17
mA
Power Supply Zener Voltage (ICC = 25 mA)
VZ
30
36
30
36
V
5. This parameter is measured at the latch trip point with VFB = 0 V.
6. Comparator gain is defined as: AV DV Output Compensation
DV Current Sense Input
7. Adjust VCC above the Startup threshold before setting to 15 V.
8. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for UC3842B, UC3843B; −25°C for UC2842B, UC2843B; −40°C for UC3842BV, UC3843BV, UC2843D
Thigh = +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B, UC2843D; +105°C for UC3842BV, UC3843BV


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