LT3496I Просмотр технического описания (PDF) - Linear Technology
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LT3496I Datasheet PDF : 20 Pages
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LT3496
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSHDN = 5V, CAP1, CAP2, CAP3 = 5V, PWM1, PWM2, PWM3 = 5V,
fADJ = 0.5V, CTRL1, CTRL2, CTRL3 = 1.5V, OVP1, OVP2, OVP3 = 0V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Operation Voltage
VIN Undervoltage Lockout
Full-Scale LED Current Sense Voltage
(VCAP1-LED1, VCAP2-LED2, VCAP3-LED3)
One-Tenth Scale LED Current Sense Voltage
(VCAP1-LED1, VCAP2-LED2, VCAP3-LED3)
(Note 4)
3
30
V
2.1 2.4
V
CAP1, CAP2, CAP3 = 24V
98 100 103
mV
l 97
104
mV
CTRL1, CTRL2, CTRL3 = 100mV, CAP1, CAP2, CAP3 = 24V
H-Grade
l 7.5
10 13.5
mV
E-Grade, I-Grade
l 7.5
10 12.5
mV
CAP1, CAP2, CAP3 Operating Voltage
VREF Output Voltage
VREF Line Regulation
Quiescent Current in Shutdown
0V ≤ VCAP1-LED1 ≤ 104mV
0V ≤ VCAP2-LED2 ≤ 104mV
0V ≤ VCAP3-LED3 ≤ 104mV
IREF = 200µA, Current Out of Pin
3V ≤ VIN ≤ 40V, IREF = 10µA
SHDN = 0V
2.5
45
V
l 1.96
2
2.04
V
0.03 %/V
0.1
10
µA
Quiescent Current Idle
PWM1, PWM2, PWM3 = 0V
6
7.5
mA
Quiescent Current Active (Not Switching)
11
14
mA
Switching Frequency
Maximum Duty Cycle
CTRL1, CTRL2, CTRL3 Input Bias Current
fADJ = 1.5V
fADJ = 0.5V
fADJ = 0.1V
fADJ = 1.5V (2.1MHz)
fADJ = 0.5V (1.3MHz)
fADJ = 0.1V (330kHz)
Current Out of Pin, CTRL1, CTRL2, CTRL3 = 0.1V
1900 2100 2300 kHz
1300
kHz
330
kHz
l 70
78
%
87
%
97
%
20 100
nA
fADJ Input Bias Current
OVP1, OVP2, OVP3 Input Bias Current
Current Out of Pin, fADJ = 0.1V
Current Out of Pin, OVP1, OVP2, OVP3 = 0.1V
20 100
nA
10 100
nA
OVP1, OVP2, OVP3 Threshold
0.95
1
1.05
V
VC1, VC2, VC3 Idle Input Bias Current
PWM1, PWM2, PWM3 = 0V
–20
0
20
nA
VC1, VC2, VC3 Output Impedance
CAP1, CAP2, CAP3 = 24V
10
MΩ
EAMP gm (ΔIVC/ΔVCAP-LED)
SW1, SW2, SW3 Current Limit
CAP1, CAP2, CAP3 = 24V
(Note 3)
200
µS
750 1000 1250 mA
SW1, SW2, SW3 VCESAT
SW1, SW2, SW3 Leakage Current
ISW = 500mA (Note 3)
SHDN = 0V, SW = 5V
260
mV
2
µA
CAP1, CAP2, CAP3 Input Bias Current
180 250
µA
CAP1, CAP2, CAP3, LED1, LED2, LED3 Idle Input PWM1, PWM2, PWM3 = 0V
Bias Current
1
µA
CAP1, CAP2, CAP3, LED1, LED2, LED3 Input Bias SHDN = 0V
Current in Shutdown
1
µA
3496ff
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