LT1786FCS Linear Technology, LT1786FCS Datasheet - Page 6

• Manufacturer Part Number: LT1786FCS
• Description: IC SW REG CCFL SMBUS PROG 16SOIC
• Manufacturer: Linear Technology

Specifications of LT1786FCS

• Applications: Converter, CCFL
• Voltage - Input: 4.5 ~ 30 V
• Number Of Outputs: 1
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -

LT1786F
TYPICAL PERFORMANCE CHARACTERISTICS
6
0.160
0.140
0.120
0.100
0.080
0.060
0.040
0.020
0.000
10
8
2
6
4
0
–75
–75
High-Side Sense Null Current Line
Regulation vs Temperature
BULB Input Bias Current
vs Temperature
– 50
– 50
–25
–25 0
TEMPERATURE ( C)
0
TEMPERATURE ( C)
25 50 75 100
25
110
100
90
80
70
60
50
40
30
20
10
50
0
Forced Beta vs I
0
75
0.2
100
W
0.4
125 150
125
0.6
150
1787 G19
1786 G22
U
CCFL I
0.8
175
175
SW
1.0
SW
on V
1.2
(A)
1.4
150
140
130
120
100
110
SW
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
90
80
70
60
50
0
–75
1.6
High-Side Sense Supply Current
vs Temperature
V
vs Switch Current
0
SW
– 50
1.8
1786 G25
Sat Voltage
–25 0
0.3
2.0
SWITCH CURRENT (A)
TEMPERATURE ( C)
25 50 75 100
0.6
T = 125 C
T = 25 C
0.9
104
103
102
101
100
125 150
99
98
97
96
1.2
–75
T = –5 C
Full-Scale Output Current
vs Temperature
1786 G20
1787 G23
–50
V(I
175
OUT
1.5
–25
) = 0.465V
TEMPERATURE ( C)
0
1.060
1.040
1.020
1.000
0.980
0.960
0.940
25
2.0
1.5
1.0
2.5
0.5
0
–75
50
High-Side Sense Null Current
vs Temperature
V
0
SW
– 50
75 100 125 150 175
10
Current Limit vs Duty Cycle
–25
20
TEMPERATURE ( C)
0
30
DUTY CYCLE (%)
25
1786 G26
40
MINIMUM
T = 125 C
T = 25 C
50
50
75
60
100
T = 0 C
125
70
150
80
1786 G21
1786 G24
175
90