NCL30000
http://onsemi.com
8
TYPICAL CHARACTERISTICS
Figure 8. Error Amplifier Sink Current vs.
Junction Temperature
T
J
, JUNCTION TEMPERATURE (C)
1251007550250−25−50
6
8
10
12
14
16
I
EA(sink)
, ERROR AMPLIFIER SINK
CURRENT (mA)
V
MFP
= 2.6 V
T
J
, JUNCTION TEMPERATURE (C) f, FREQUENCY (kHz)
1251007550250−25−50
85
90
95
105
110
120
125
1001010.10.01
200
0
20
60
100
140
160
T
J
, JUNCTION TEMPERATURE (C) T
J
, JUNCTION TEMPERATURE (C)
12510075250−25−50
0.3
0.4
0.5
0.7
0.8
1.0
1251007550250−25−50
264
266
270
274
278
gm, ERROR AMPLIFIER TRANSCONDUCTANCE (mS)
gm, ERROR AMPLIFIER TRANSCONDUCTANCE (mS)
Ct
(offset)
, MINIMUM CONTROL VOLTAGE
TO GENERATE DRIVE PULSES (V)
I
charge
, Ct CHARGE CURRENT (mA)
1000
50
Figure 9. Error Amplifier Source Current vs.
Junction Temperature
180
185
190
195
200
205
215
220
−50 −25 0 25 50 75 100 125
T
J
, JUNCTION TEMPERATURE (C)
I
EA(source)
, ERROR AMPLIFIER
SOURCE CURRENT (mA)
Figure 10. Error Amplifier Transconductance
vs. Junction Temperature
Figure 11. Error Amplifier Transconductance
and Phase vs. Frequency
Figure 12. Minimum Control Voltage to Generate
Drive Pulses vs. Junction Temperature
Figure 13. On Time Capacitor Charge Current
vs. Junction Temperature
V
MFP
= 0.5 V
210
100
115
40
80
120
180
Phase
Transconductance
R
Control
= 100 kW
C
Control
= 2 pF
V
MFP
= 2.5 Vdc, 1 Vac
V
CC
= 12 V
T
A
= 25C
200
0
20
60
100
140
160
40
80
120
180
q, PHASE (DEGREES)
0.6
0.9
268
272
276