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LTC3816
7
3816f
Load Regulation vs Temperature
Typical perForMance characTerisTics
V
IMON
vs Temperature
Load Step in Forced Continuous
Mode
Narrow TG Pulse Width with Low
V
CC(CORE)
Ripple
Pulse-Skipping Mode at No Load
with Low V
CC(CORE)
Ripple
Pulse-Skipping Mode
at 0.2A Load
Line Regulation
TEMPERATURE (°C)
–50
–100
∆V
CC(CORE)
(mV)
–90
–70
–60
–50
0
–30
0
50
75
3816 G09
–80
–20
–10
–40
–25
25
100
125
V
IN
= 12V, f
OSC
= 400kHz
V
EXTVCC
= 0V, AVP = –3mV/A
L = VISHAY IHLP5050CE01 0.33µH
PTC CONFIGURATION (FIGURE 12)
R
LPTC
= VISHAY TFPT1206L1002FV
R
VDCRP
= 23.2k, C
VDCRP
= 10nF
NTC CONFIGURATION,
LAST PAGE CIRCUIT
NO TEMPERATURE COMPENSATION
LAST PAGE CIRCUIT, REPLACE NTC
WITH 10k RESISTOR
IDEAL VALUE
5A LOAD
10A LOAD
20A LOAD
V
IN
(V)
0
V
CC(CORE)
(V)
0.7515
12
3816 G10
0.7500
0.7490
4 8 16
0.7485
0.7480
0.7520
0.7510
0.7505
0.7495
20 24 28
f
OSC
= 400kHz, V
EXTVCC
= 0V
FORCED CONTINUOUS MODE
NO LOAD
LAST PAGE CIRCUIT
TEMPERATURE (°C)
–50
0
V
IMON
(V)
0.1
0.3
0.4
0.5
1.1
1.0
0.7
0
50
75
3816 G11
0.2
0.8
0.9
0.6
–25
25
100
125
V
IN
= 12V, f
OSC
= 400kHz
V
EXTVCC
= 0V, AVP = –3mV/A
R
PREIMON
= 5.1k, R
IMON
= 21k
PTC CONFIGURATION (FIGURE 12)
R
LPTC
= VISHAY TFPT1206L1002FV
R
VDCRP
= 23.2k, C
VDCRP
= 10nF
NTC CONFIGURATION,
LAST PAGE CIRCUIT
NO TEMPERATURE COMPENSATION
LAST PAGE CIRCUIT, REPLACE NTC
WITH 10k RESISTOR
IDEAL VALUE
5A LOAD
L = VISHAY IHLP5050CE01 0.33µH
10A LOAD
20A LOAD
V
CC(CORE)
50mV/DIV
LOAD
CURRENT
20A/DIV
20µs/DIV
3816 G12
V
IN
= 12V
V
CC(CORE)
= 0.75V
f
OSC
= 400kHz
FORCED CONTINUOUS MODE
AVP SLOPE = –3mV/A
V
CC(CORE)
20mV/DIV
V
TG
-V
SW
2V/DIV
V
BG
5V/DIV
ZOOM IN
V
TG
-V
SW
1V/DIV
20ns/DIV
∆t = 24.6ns
20µs/DIV
3816 G13
V
IN
= 28V
V
CC(CORE)
= 0.5V (I
LOAD
= 0.5A)
f
OSC
= 400kHz
FORCED CONTINUOUS MODE
V
CC(CORE)
20mV/DIV
V
TG
-V
SW
2V/DIV
V
BG
5V/DIV
100µs/DIV
3816 G14
V
IN
= 12V
V
CC(CORE)
= 0.75V, NO LOAD
f
OSC
= 400kHz
PULSE-SKIPPING MODE
V
CC(CORE)
20mV/DIV
V
TG
-V
SW
2V/DIV
V
BG
5V/DIV
5µs/DIV
3816 G15
V
IN
= 12V
V
CC(CORE)
= 0.75V (I
LOAD
= 0.2A)
f
OSC
= 400kHz
PULSE-SKIPPING MODE