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UC3844B Datasheet(PDF) 5 Page - ON Semiconductor

Part No. UC3844B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3844B Datasheet(HTML) 5 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 8], 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 9], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
PWM SECTION
Duty Cycle
Maximum (UC284XB, UC384XB)
Maximum (UC384XBV)
Minimum
DC(max)
DC(min)
47
48
50
0
47
46
48
48
50
50
0
%
TOTAL DEVICE
Power Supply Current
Startup (VCC = 6.5 V for UCX845B,
Startup (VCC = 14 V for UCX844B, BV)
Operating (Note 8)
ICC
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
8. Adjust VCC above the Startup threshold before setting to 15 V.
9. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow =0°C for UC3844B, UC3845B
Thigh =+ 70°C for UC3844B, UC3845B
=− 25
°C for UC2844B, UC2845B
= + 85
°C for UC2844B, UC2845B
=− 40
°C for UC3844BV, UC3845BV
= +105
°C for UC3844BV, UC3845BV
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)
Figure 2. Timing Resistor
versus Oscillator Frequency
Figure 3. Output Deadtime
versus Oscillator Frequency
1.0 M
100 k
10 k
fOSC, OSCILLATOR FREQUENCY (kHz)
50
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
55
60
65
70
75
20 k
50 k
200 k
500 k
2
3
7
5
6
NOTE: Output switches at
1/2 the oscillator frequency
VCC = 15 V
TA = 25°C
0.5
ms/DIV
2.55 V
2.5 V
2.45 V
VCC = 15 V
AV = −1.0
TA = 25°C
VCC = 15 V
AV = −1.0
TA = 25°C
1.0
ms/DIV
2.5 V
3.0 V
2.0 V
Figure 4. Error Amp Small Signal
Transient Response
Figure 5. Error Amp Large Signal
Transient Response
1
4


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