UC384XBD MOTOROLA [Motorola, Inc], UC384XBD Datasheet - Page 4

• Manufacturer Part Number: UC384XBD
• Description: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
• Manufacturer: MOTOROLA [Motorola, Inc]

2.55 V
2.45 V
ELECTRICAL CHARACTERISTICS
the operating ambient temperature range that applies [Note 3], unless otherwise noted.)
PWM SECTION
TOTAL DEVICE
NOTES: 2. Adjust V CC above the Startup threshold before setting to 15 V.
2.5 V
Duty Cycle
Power Supply Current
Power Supply Zener Voltage (I CC = 25 mA)
4
Maximum (UC284XB, UC384XB)
Maximum
Minimum
Startup (V CC = 6.5 V for UCX845B,
Operating (Note 2)
8.0
5.0
2.0
0.8
80
50
20
Start–Up (V CC
10 k
NOTE: Output switches at
1/2 the oscillator frequency
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T low = 0 C for UC3844B, UC3845B
20 k
(UC384XBV)
= – 25 C for UC2844B, UC2845B
= – 40 C for UC3844BV, UC3845BV
Figure 3. Error Amp Small Signal
versus Oscillator Frequency
f OSC , OSCILLATOR FREQUENCY (kHz)
Figure 1. Timing Resistor
14 V for UCX844B, BV)
Characteristic
Transient Response
50 k
0.5 s/DIV
100 k
200 k
(V CC = 15 V [Note 2], R T = 10 k, C T = 3.3 nF. For typical values T A = 25 C, for min/max values T A is
UC3844B, 45B UC2844B, 45B
V CC = 15 V
A V = –1.0
T A = 25 C
500 k
V CC = 15 V
T A = 25 C
T high = + 70 C for UC3844B, UC3845B
= + 85 C for UC2844B, UC2845B
= +105 C for UC3844BV, UC3845BV
1.0 M
DC (max)
Symbol
DC (min)
I CC
V Z
3.0 V
2.5 V
2.0 V
75
70
65
60
55
50
10 k
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Min
47
30
1. C T = 10 nF
2. C T = 5.0 nF
3. C T = 2.0 nF
4. C T = 1.0 nF
5. C T = 500 pF
6. C T = 200 pF
7. C T = 100 pF
–
–
–
–
UC284XB
20 k
Figure 4. Error Amp Large Signal
Typ
0.3
48
12
36
–
–
MOTOROLA ANALOG IC DEVICE DATA
versus Oscillator Frequency
f OSC , OSCILLATOR FREQUENCY (kHz)
Figure 2. Output Deadtime
Transient Response
Max
0.5
50
17
–
0
–
50 k
1.0 s/DIV
100 k
Min
47
46
30
–
–
–
UC384XB, XBV
200 k
Typ
0.3
48
48
12
36
–
1
V CC = 15 V
A V = –1.0
T A = 25 C
Max
0.5
50
50
17
0
–
500 k
2
6
5
3
4
Unit
7
mA
1.0 M
%
V