MC34025 ON Semiconductor, MC34025 Datasheet - Page 4

• Manufacturer Part Number: MC34025
• Description: (MC33025 / MC34025) High Speed Single-Ended PWM Controller
• Manufacturer: ON Semiconductor

2.55 V
2.45 V
100 k
2.5 V
1.0 k
− 20
10 k
470
120
100
80
60
40
20
0
100
10
C
1. 100 nF
2. 47 nF
3. 22 nF
4. 10 nF
5. 4.7 nF
6. 2.2 nF
7. 1.0 nF
8. 470 pF
9. 220 pF
1
T
=
Figure 4. Error Amp Open Loop Gain and
100
Figure 2. Timing Resistor versus
Phase
Figure 6. Error Amp Small Signal
1000
3
2
f
osc
Phase versus Frequency
, OSCILLATOR FREQUENCY (Hz)
Oscillator Frequency
Transient Response
1.0 k
5
4
f, FREQUENCY (Hz)
10
4
Gain
7
0.1 ms/DIV
6
10 k
9
10
8
5
100 k
10
V
T
1.0 M
A
CC
6
MC34025, MC33025
= + 25°C
= 15 V
http://onsemi.com
10 M
10
7
45
90
135
0
4
3.0 V
2.5 V
2.0 V
1200
1000
800
600
400
200
1.28
1.26
1.24
1.22
Figure 3. Oscillator Frequency versus Temperature
− 55
1.3
1.2
0
−55
Figure 5. PWM Comparator Zero Duty Cycle
V
V
Pin 7(9) = 0 V
Threshold Voltage versus Temperature
CC
− 25
CC
−25
= 15 V
Figure 7. Error Amp Large Signal
= 15 V
T
T
0
A
A
Transient Response
, AMBIENT TEMPERATURE (°C)
0
, AMBIENT TEMPERATURE (°C)
25
0.1 ms/DIV
25
50
50
1.0 MHz
400 kHz
50 kHz
75
75
R
C
R
C
R
C
T
T
T
T
100
T
T
= 1.2 k
= 3.6 k
100
= 1.0 nF
= 1.0 nF
= 36 k
= 1.0 nF
125
125