UC2845BD1G View Datasheet(PDF) - ON Semiconductor
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Description
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UC2845BD1G Datasheet PDF : 19 Pages
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UC3844B, UC3845B, UC2844B, UC2845B
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 11], 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 12], unless otherwise noted.)
UC284xB
UC384xB, xBV, NCV384xBV
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,
Startup (VCC = 14 V for UCX844B, BV)
Operating (Note 11)
%
DC(max)
47
48
50
47
48
50
−
−
−
46
48
50
DC(min)
−
−
0
−
−
0
ICC
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
11. Adjust VCC above the Startup threshold before setting to 15 V.
12. 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 UC384xBV, NCV384xBV
= +105°C for UC3844BV, UC3845BV
=+125°C for NCV384xBV
80
50
20
8.0
5.0
VCC = 15 V
TA = 25°C
75
ÄÄÄÄÄ 1. CT = 10 nF
ÄÄÄÄÄ 2. CT = 5.0 nF
70 3. CT = 2.0 nF
ÄÄÄÄÄ 4. CT = 1.0 nF
5. CT = 500 pF
ÄÄÄÄÄ 65 6. CT = 200 pF
ÄÄÄÄÄ 7. CT = 100 pF
ÄÄÄÄÄ 60
1
3
24
7
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 1.0 M
fOSC, OSCILLATOR FREQUENCY (kHz)
For
RT
u
5
Kf
X
1.72
RTCT
Figure 2. Timing Resistor
versus Oscillator Frequency
55
50
10 k
5
6
20 k
50 k 100 k 200 k
500 k 1.0 M
fOSC, OSCILLATOR FREQUENCY (kHz)
Figure 3. Output Deadtime
versus Oscillator Frequency
2.55 V
VCC = 15 V
AV = -1.0
TA = 25°C
3.0 V
VCC = 15 V
AV = -1.0
TA = 25°C
2.5 V
2.5 V
2.45 V
0.5 ms/DIV
Figure 4. Error Amp Small Signal
Transient Response
2.0 V
1.0 ms/DIV
Figure 5. Error Amp Large Signal
Transient Response
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