Datasheet

ADP1877 Data Sheet
Rev. D | Page 12 of 32
CH3 1V
CH2 2VCH1 10V
CH4 1V
M10ms A CH2 1.52V
C
SS
= 100nF
V
OUT
(CH3)
SS (CH4)
EN
SW
0
8299-040
1
2
3
4
Figure 17. Enable Function
CH3 2V
CH2 2VCH1 10V
CH4 2V Ω
M10ms A CH2 3.76V
SW1
PGOOD1
VCCO (CH3)
V
OUT
, PRELOADED (CH4)
0
8299-041
1
2
3
4
Figure 18. Thermal Shutdown Waveform
–2.5
–2.0
–1.5
–1.0
–0.5
0
0.5
2468101214
CHANGE IN
f
OSC
(%)
V
IN
(V)
300kHz
600kHz
850kHz
REFERENCE AT V
IN
= 2.75V
08299-030
Figure 19. Change in f
OSC
vs. V
IN
–2.5
–2.0
–1.5
–1.0
–0.5
0
0.5
1.0
1.5
2.0
–40 –15 10 35 60 85 110 135
CHANGE IN
f
OSC
(%)
TEMPERATURE (°C)
V
IN
= 12V; REFERENCED AT 25°C
0
8299-031
Figure 20. f
OSC
vs. Temperature
50
100
150
200
250
300
350
2.5 4.5 6.5 8.5 10.5 12.5 14.5
TIME (ns)
V
IN
(V)
DH MINIMUM OFF TIME
DH MINIMUM ON TIME
08299-032
Figure 21. Typical DH Minimum On Time and Off Time
–4
–3
–2
–1
0
1
2
3
4
–40 –15 10 35 60 85 110 135
CHANGE IN MINIMUM ON/OFF TIME (%)
TEMPERATURE (°C)
DH MINIMUM ON TIME
DH MINIMUM OFF TIME
08299-033
Figure 22. DH Minimum On Time and Off Time Overtemperature