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LT1768CGN#PBF

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LT1768
4
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
5.10
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
4.90
V
REF
VOLTAGE (V)
1768 G01
–50 –25 0 25
50
75
100 125
I
REF
= –1mA
TEMPERATURE (°C)
1.30
1.29
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
VOLTAGE (V)
1768 G02
–50 –25 0 25
50
75
100 125
V
RMIN(V)
V
RMAX(V)
I
RMIN
= –100µA
I
RMAX
= –100µA
TEMPERATURE (°C)
80
76
72
68
64
60
56
52
48
44
40
SHUTDOWN CURRENT (µA)
1768 G03
–50 –25 0 25
50
75
100 125
V
SHDN
= 0V
INPUT VOLTAGE (V)
10
8
6
4
2
0
SUPPLY CURRENT (mA)
1768 G04
05
10
15 20 25
V
RMIN
, V
RMAX
vs Temperature
Supply Current in Shutdown vs
Temperature
Supply Current vs Input Voltage
V
REF
vs Temperature
TEMPERATURE (°C)
7.40
7.30
7.20
7.10
7.00
6.90
6.80
6.70
6.60
6.50
6.40
SUPPLY CURRENT (mA)
1768 G05
–50 –25 0 25
50
75
100 125
INPUT VOLTAGE (V)
100
80
60
40
20
0
SHUTDOWN CURRENT (µA)
1768 G06
05
10
15 20 25
V
SHDN
= 0V
TEMPERATURE (
°C)
2.00
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0
SHUTDOWN VOLTAGE (V)
1768 G08
–50 –25 0 25
50
75
100 125
V
SHDN
ON TO OFF
V
SHDN
OFF TO ON
Supply Current vs Temperature
Supply Current in Shutdown vs
Input Voltage
Undervoltage Lockout Threshold
vs Temperature
SHDN Pull-Up Current
vs Input Voltage
Shutdown Threshold Voltage vs
Temperature
TEMPERATURE (°C)
8.20
8.10
8.00
7.90
7.80
7.70
7.60
7.50
7.40
7.30
7.20
UNDERVOLTAGE LOCKOUT (V)
1768 G09
–50 –25 0 25
50
75
100 125
V
UVL
ON TO OFF
V
UVL
OFF TO ON
INPUT VOLTAGE (V)
0
SHDN PULL-UP CURRENT (µA)
10
8
6
4
2
0
20
1768 G07
5
10
15
25
V
SHDN
= 0V
LT1768
5
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switching Frequency vs Temperature
TEMPERATURE (°C)
400
390
380
370
360
350
340
330
320
310
300
SWITCHING FREQUENCY (kHz)
1768 G10
–50 –25 0 25
50
75
100 125
TEMPERATURE (°C)
124
120
116
112
108
104
100
96
92
88
84
PWM FREQUENCY (Hz)
1768 G11
–50 –25 0 25
50
75
100 125
C
T
= 0.22µF
V
PWM
= 2.5V
TEMPERATURE (°C)
0.250
0.225
0.200
0.175
0.150
0.125
0.100
0.75
0.50
0.25
0
FAULT VOLTAGE (V)
1768 G12
–50 –25 0 25
50
75
100 125
I
DIO1
= 0µA
I
DIO2
= 0µA
I
FAULT
= 1mA
I
FAULT
(mA)
0
450
400
350
300
250
200
150
100
1.5 2.5
1768 G13
0.5 1.0
2.0 3.0 3.5
FAULT VOLTAGE (mV)
I
DIO1
= 0µA
I
DIO2
= 0µA
TEMPERATURE (°C)
50
45
40
35
30
25
20
15
10
5
0
SENSE CURRENT (µA)
1768 G14
–50 –25 0 25
50
75
100 125
V
SENSE
= 0V
TEMPERATURE (°C)
15.00
14.50
14.00
13.50
13.00
12.50
12.00
11.50
11.00
10.50
10.00
GATE CLAMP VOLTAGE (V)
1768 G15
–50 –25 0 25
50
75
100 125
I
GATE
= –10mA
V
IN
= 24V
V
IN
= 12V
FAULT Pin Saturation Voltage vs
Current
Maximum Gate Voltage vs
Temperature
Sense Pin Bias Current vs
Temperature
PWM Frequency vs Temperature
FAULT Pin Saturation Voltage vs
Temperature
DIO CURRENT (mA)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
DIO VOLTAGE (V)
1768 G24
2468
10
12
14 16 18 200
V
C
CURRENT (µA)
3.75
3.74
3.73
3.72
3.71
3.70
3.69
3.68
3.67
3.66
3.65
V
C
CLAMP VOLTAGE (V)
1768 G25
0 50 100 150
200
250
300 350 400 450 500
VC Clamp Voltage vs CurrentDIO Pin Voltage vs Current
DIO CURRENT (mA)
–2.0
–1.8
–1.6
–1.4
–1.2
–1.0
–0.8
–0.6
–0.4
–0.2
0
DIO VOLTAGE (V)
1768 G20
–2 –4 –6 –8
–10
–12
–14 –16 –18 –200
DIO Pin Voltage vs Current
LT1768
6
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (°C)
3.90
3.85
3.80
3.75
3.70
3.65
3.60
3.55
3.50
3.45
3.40
V
C CLAMP
(V)
1768 G26
–50 –25 0 25
50
75
100 125
I
VC
= 500µA
TEMPERATURE (°C)
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
V
C
SWITCH THRESHOLD VOLTAGE (V)
1768 G27
–50 –25 0 25
50
75
100 125
PWM VOLTAGE (V)
0
PWM INPUT CURRENT (µA)
25
20
15
10
5
0
4
1768 G28
1
2
3
5
TEMPERATURE (°C)
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
0.60
0.50
0.40
PWM INPUT CURRENT (µA)
1768 G29
–50 –25 0 25
50
75
100 125
V
PWM
= 2.5V
TEMPERATURE (°C)
200
180
160
140
120
100
80
60
40
20
0
BULB FAULT CURRENT THRESHOLD (µA)
1768 G31
–50 –25 0 25
50
75
100 125
GATE DUTY CYCLE (%)
120
110
100
90
80
70
60
50
40
30
20
SENSE THRESHOLD (mV)
1768 G32
0 102030
40
50
60 70 80 90 100
Lamp Fault Current Threshold
vs Temperature
Maximum Sense Threshold
vs Gate Drive Duty Cycle
PWM Pin Input Current vs
Temperature
VC Switching Threshold
vs Temperature
PWM Pin Input Current
vs Voltage
VC Clamp Voltage vs Temperature
I
RMAX
(µA)
110
108
106
104
102
100
98
96
94
92
90
I
DI01/2
TO I
RMAX
RATIO (A/A)
1768 G33
0 –60
–120
–180 –240 –300
V
PROG
= 4.5V
V
VC
= 2.5V
I
RMIN
(µA)
11.0
10.8
10.6
10.4
10.2
10.0
9.8
9.6
9.4
9.2
9.0
I
DI01/2
TO I
RMIN
RATIO (A/A)
1768 G35
0 –60
–120
–180 –240 –300
V
PROG
= 0.75V
V
VC
= 2.5V
I
DIO1/2
to I
RMAX
Ratio vs R
MAX
Current
I
DIO1/2
to I
RMAX
Ratio vs R
MAX
Current with a Lamp Fault
I
DIO1/2
to I
RMIN
Ratio vs R
MIN
Current
I
RMAX
(µA)
60
58
56
54
52
50
48
46
44
42
40
I
DI01/2
TO I
RMAX
RATIO (A/A)
1768 G34
0 –60
–120
–180 –240 –300
V
PROG
= 4.5V
V
VC
= 2.5V
I
DI01
OR I
DI02
= 0µA
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LT1768CGN#PBF

Mfr. #:
Buy LT1768CGN#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Hi Pwr CCFL Cntr for Wide Dimming Rng &
Lifecycle:
New from this manufacturer.
Delivery:
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