MC33368
http://onsemi.com
5
V
FB(OV)
, OVERVOLTAGE INPUT THRESHOLD (% V )
V
CS
, CURRENT SENSE PIN 6 THRESHOLD (V)
6.0 V
−55
110
−0.12
0.08
10
100
−55
16
−0.2
1.6
θ, EXCESS PHASE (DEGREES)
5.0 ms/DIV
T
A
, AMBIENT TEMPERATURE (°C)
V
M
, MULTIPLIER PIN 5 INPUT VOLTAGE (V)
g
m
, TRANSCONDUCTANCE ( mho)μ
f, FREQUENCY (Hz)
V
FB
, VOLTAGE FEEDBACK THRESHOLDΔ
T
A
, AMBIENT TEMPERATURE (°C)
V
CS
, CURRENT SENSE PIN 6 THRESHOLD (V)
Figure 2. Current Sense Input Threshold
versus Multiplier Input
V
M
, MULTIPLIER PIN 5 INPUT VOLTAGE (V)
Figure 3. Current Sense Input Threshold
versus Multiplier Input, Expanded View
V
CC
= 14 V
T
A
= 25°C
Figure 4. Reference Voltage versus Temperature Figure 5. Overvoltage Comparator Input
Threshold versus Temperature
Figure 6. Error Amplifier Transconductance
and Phase versus Frequency
Figure 7. Error Amplifier Transient Response
V
CC
= 14 V
V
CC
= 14 V
T
A
= 25°C
V
CC
= 14 V
V
O
= 2.0 to 4.0 V
R
L
= 10 kW
T
A
= 25°C
Phase
Transconductance
CHANGE (mV)
1.2
1.0
0.6
0.4
0.2
0
12
8.0
4.0
0
−4.0
80
60
40
20
0
−20
0.06
0.05
0.03
0.02
0.01
0
109
108
107
106
4.0 V
2.0 V
0 V
−1.0 V
0.04
0.07
0.8
1.4
0.6 1.4 2.2 3.0 −0.06 0 0.06 0.12 0.20
−25 0 25 50 75 125100 −25 0 25 50 75 100 12
100 1.0 k 10 k 100 k 1.0 M 10 M
0
30
60
90
120
150
180
V
CC
= 14 V
FB
V
Pin
4
= 4.0 V
= 3.0 V
= 2.75 V
= 2.5 V
= 2.25 V
= 2.0 V
= 3.75 V
= 3.5 V
= 3.25 V
V
Pin
4
= 4.0 V
= 3.0 V
= 2.75 V
= 2.5 V
= 2.25 V
= 2.0 V