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UC3842B Datasheet(PDF) 4 Page - Motorola, Inc

Part # UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3842B Datasheet(HTML) 4 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
4
MOTOROLA ANALOG IC DEVICE DATA
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 2], 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 3], unless otherwise noted.)
UC284XB
UC384XB, BV
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
PWM SECTION
Duty Cycle
Maximum (UC284XB, UC384XB)
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,
Startup (VCC 14 V for UCX842B, BV)
Operating (Note 2)
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
NOTES: 2. Adjust VCC above the Startup threshold before setting to 15 V.
3. 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
Thigh = +70°C for UC3842B, UC3843B
Tlow = –25°C for UC2842B, UC2843B
Thigh = +85°C for UC2842B, UC2843B
Tlow = –40°C for UC3842BV, UC3843BV
Thigh = +105°C for UC3842BV, UC3843BV
0.8
2.0
5.0
8.0
20
50
80
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
fOSC, OSCILLATOR FREQUENCY (kHz)
VCC = 15 V
TA = 25°C
Figure 1. Timing Resistor
versus Oscillator Frequency
Figure 2. Output Deadtime
versus Oscillator Frequency
1.0 M
500 k
200 k
100 k
50 k
20 k
10 k
fOSC, OSCILLATOR FREQUENCY (kHz)
1.0
2.0
5.0
10
20
50
100
1
2
Figure 3. Oscillator Discharge Current
versus Temperature
Figure 4. Maximum Output Duty Cycle
versus Timing Resistor
7.0
–55
TA, AMBIENT TEMPERATURE (°C)
– 25
0
25
50
75
100
125
7.5
8.0
8.5
9.0
VCC = 15 V
VOSC = 2.0 V
40
0.8
RT, TIMING RESISTOR (kΩ)
1.0
2.0
3.0
4.0
5.0 6.0 7.0 8.0
50
60
70
80
90
100
Idischg = 7.5 mA
VCC = 15 V
CT = 3.3 nF
TA = 25°C
1. CT = 10 nF
2. CT = 5.0 nF
3. CT = 2.0 nF
4. CT = 1.0 nF
5. CT = 500 pF
6. CT = 200 pF
7. CT = 100 pF
5
Idischg = 8.8 mA
7
3
6
4
VCC = 15 V
TA = 25°C


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