5
LTC1736
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Maximum Current Sense Threshold
vs Normalized Output Voltage
(Foldback)
NORMALIZED OUTPUT VOLTAGE (%)
0
CURRENT SENSE THRESHOLD (mV)
40
50
60
100
1736 G10
30
20
0
25
50
75
10
80
70
V
RUN/SS
(V)
0
0
CURRENT SENSE THRESHOLD (mV)
20
40
60
80
1234
1736 G11
56
V
SENSE(CM)
= 1.6V
COMMON MODE VOLTAGE (V)
0
CURRENT SENSE THRESHOLD (mV)
72
76
80
1736 G12
68
64
60
0.5
1 1.5 2
Maximum Current Sense Threshold
vs V
RUN/SS
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
Maximum Current Sense Threshold
vs I
TH
Voltage
V
ITH
(V)
0
CURRENT SENSE THRESHOLD (mV)
30
50
70
90
2
1736 G13
10
–10
20
40
60
80
0
–20
–30
0.5
1
1.5
2.5
V
RUN/SS
(V)
0
0
V
ITH
(V)
0.5
1.0
1.5
2.0
2.5
1
234
1736 G15
56
V
OSENSE
= 0.7V
V
ITH
vs V
RUN/SS
TEMPERATURE (°C)
–40 –15
–5
RUN/SS CURRENT (µA)
–3
0
10
60
85
1736 G16
–4
–1
–2
35
110
135
V
RUN/SS
= 0V
RUN/SS Pin Current
vs Temperature
FCB Pin Current vs Temperature
TEMPERATURE (°C)
–40 –15
–1.0
FCB CURRENT (µA)
–0.6
0
10
60
85
1736 G17
–0.8
–0.2
–0.4
35
110
135
V
FCB
= 0.85V
Maximum Current Sense Threshold
vs Temperature
TEMPERATURE (°C)
–40
60
CURRENT SENSE THRESHOLD (mV)
65
70
75
80
–15 10 35 60
1736 G18
85 110 135
V
SENSE(CM)
= 1.6V
DUTY CYCLE (%)
0
0
AVERAGE OUTPUT CURRENT I
OUT
/I
MAX
(%)
20
40
60
80
100
20
40 60 80
1736 G14
100
f
SYNC
= f
O
I
OUT
/I
MAX
(SYNCHRONIZED)
I
OUT
/I
MAX
(FREE RUN)
Output Current vs Duty Cycle
