UC2844BN 查看數據表（PDF） - Motorola => Freescale
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UC2844BN Datasheet PDF : 16 Pages
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UC3844B, 45B UC2844B, 45B
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, XBV
Characteristic
Symbol
Min Typ Max Min Typ Max Unit
PWM SECTION
Duty Cycle
Maximum (UC284XB, UC384XB)
Maximum (UC384XBV)
Minimum
TOTAL DEVICE
Power Supply Current
Startup (VCC = 6.5 V for UCX845B,
Start–Up (VCC 14 V for UCX844B, BV)
Operating (Note 2)
DC(max)
DC(min)
ICC
%
47
48
50
47
48
50
–
–
–
46
48
50
–
–
0
–
–
0
mA
–
0.3 0.5
–
0.3 0.5
–
12
17
–
12
17
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 UC3844B, UC3845B
= – 25°C for UC2844B, UC2845B
Thigh = + 70°C for UC3844B, UC3845B
= + 85°C for UC2844B, UC2845B
= – 40°C for UC3844BV, UC3845BV
= +105°C for UC3844BV, UC3845BV
Figure 1. Timing Resistor
versus Oscillator Frequency
80
VCC = 15 V
50
TA = 25°C
20
8.0
5.0
2.0
NOTE: Output switches at
1/2 the oscillator frequency
0.8
10 k 20 k
50 k
100 k
200 k
500 k
fOSC, OSCILLATOR FREQUENCY (kHz)
1.0 M
Figure 2. Output Deadtime
versus Oscillator Frequency
75
ÄÄÄÄ 1. CT = 10 nF
2. CT = 5.0 nF
ÄÄÄÄ 70 3. CT = 2.0 nF
4. CT = 1.0 nF
ÄÄÄÄ 5. CT = 500 pF
ÄÄÄÄ 65 6. CT = 200 pF
1
ÄÄÄÄ 7. CT = 100 pF
2
3
4
60
7
55
5
50
10 k
6
20 k
50 k 100 k 200 k
500 k 1.0 M
fOSC, OSCILLATOR FREQUENCY (kHz)
2.55 V
Figure 3. Error Amp Small Signal
Transient Response
VCC = 15 V
AV = –1.0
TA = 25°C
Figure 4. Error Amp Large Signal
Transient Response
VCC = 15 V
3.0 V
AV = –1.0
TA = 25°C
2.5 V
2.5 V
2.45 V
0.5 µs/DIV
2.0 V
1.0 µs/DIV
4
MOTOROLA ANALOG IC DEVICE DATA
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