LT1932 Ver la hoja de datos (PDF) - Linear Technology
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LT1932 Datasheet PDF : 16 Pages
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TYPICAL PERFOR A CE CHARACTERISTICS
LT1932
Switch Saturation Voltage (VCESAT)
400
350
TJ = 125°C
300
TJ = 25°C
250
200
TJ = –50°C
150
100
50
0
0 100 200 300 400 500 600
SWITCH CURRENT (mA)
1932 G01
LED Pin Voltage
400
350
300
250
TJ = 125°C
200
TJ = 25°C
150
TJ = –50°C
100
50
0
0 5 10 15 20 25 30 35 40
LED CURRENT (mA)
1932 G04
Quiescent Current
2.00
1.75
1.50
VIN = 10V
1.25
1.00
VIN = 1.2V
0.75
0.50
0.25
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1932 G07
Switch Current Limit
700
600
VIN = 1.2V
VIN = 10V
500
400
300
200
100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1932 G02
Switching Frequency
2.0
1.8
1.6
1.4
VIN = 10V
1.2
1.0
VIN = 1.2V
0.8
0.6
0.4
0.2
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1932 G03
LED Current
50
45
RSET = 562Ω
40
35
RSET = 750Ω
30
25
20
RSET = 1.50k
15
10
RSET = 4.53k
5
0
– 50 – 25
0 25 50 75
TEMPERATURE (°C)
100 125
1932 G05
LED Current
50
45
RSET = 562Ω
40
35
RSET = 750Ω
30
25
20
RSET = 1.50k
15
10
RSET = 4.53k
5
0
0
2
4
6
8
INPUT VOLTAGE (V)
10
1932 G06
SHDN Pin Current
Switching Waveforms
50
45
TJ = –50°C
VSW
10V/DIV
40
IL1
35
200mA/DIV
30
TJ = 25°C
VOUT
20mV/DIV
25
AC COUPLED
ILED
20
TJ = 125°C
10mA/DIV
15
VIN = 3V
0.5µs/DIV
4 WHITE LEDs
10
ILED = 15mA
CIRCUIT ON FIRST PAGE
5
OF THIS DATA SHEET
0
0
2
4
6
8
10
SHDN PIN VOLTAGE (V)
1932 G08
1093 G09
1932f
3
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