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| 型号： | LT3478IFE-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR HP CONS CURR 16TSSOP |
| 标准包装： | 95 |
| 恒定电流： | 是 |
| 拓扑： | PWM，降压（降压），升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 车载，背光 |
| 类型 - 次要： | 颜色，白色 LED |
| 频率： | 200kHz ~ 2.25MHz |
| 电源电压： | 2.8 V ~ 36 V |
| 输出电压： | 42V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
LT3478/LT3478-1
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. SW = open, V IN = V S = L = V OUT = ? S ? H ? D ? N = 2.7V, LED = open, SS = open,
PWM = CTRL1, CTRL2 = 1.25V, V REF = open, V C = open, R T = 31.6k.
PARAMETER
Frequency: f OSC 2.25MHz
Line Regulation f OSC
CONDITIONS
R T = 9.09k
R T = 31.6k, 2.7V < V IN < 36V
MIN
2
TYP
2.25
0.05
MAX
2.6
0.2
UNITS
MHz
%/V
Nominal R T Pin Voltage
0.64
V
Maximum Duty Cycle
R T = 31.6k
●
80
88
%
R T = 200k
R T = 9.09k
97
73
%
%
LED Current to V C Current Gain
LED Current to V C Voltage Gain
V C to Switch Current Gain
V C Source Current (Out of Pin)
V C Sink Current
V C Switching Threshold
V C High Level (V OH )
V C Low Level (V OL )
(Note 6)
(Note 6)
CTRL1 = 0.4V, V C = 1V
CTRL1 = 0V, V C = 1V
CTRL1 = 0.4V
CTRL1 = 0V
770
400
13
40
40
0.65
1.5
0.2
μA/A
V/A
A/V
μA
μA
V
V
V
Inductor Current Limit
Switch Current Limit
2.7V < V S < 36V
●
●
4.5
4.5
6
6.3
6.8
7.5
A
A
Switch V CE SAT
Switch Leakage Current
V OUT Overvoltage Protection (OVP)
(Rising)
I SW = 4.5A
SW = 42V, V C = 0V
OVPSET = 1V
OVPSET = 0.3V
270
1
41
12.3
mV
μA
V
V
Full Scale LED Current (LT3478-1)
CTRL1 = V REF , Current Out of LED Pin
1010
1050
1090
mA
700mA LED Current (LT3478-1)
350mA LED Current (LT3478-1)
100mA LED Current (LT3478-1)
CTRL1 = 700mV, Current Out of LED Pin
CTRL1 = 350mV, Current Out of LED Pin
CTRL1 = 100mV, Current Out of LED Pin
●
655
325
70
700
350
100
730
375
130
mA
mA
mA
Full Scale LED Current V SENSE (LT3478) CTRL1 = V REF , V SENSE = V VOUT – V LED
101
105
109
mV
CTRL1 = 700mV, V SENSE (LT3478)
CTRL1 = 350mV, V SENSE (LT3478)
CTRL1 = 100mV, V SENSE (LT3478)
CTRL1 = 700mV, V SENSE = V VOUT – V LED
CTRL1 = 350mV, V SENSE = V VOUT – V LED
CTRL1 = 100mV, V SENSE = V VOUT – V LED
●
67
33
7
70.5
35.5
10
74
38
13
mV
mV
mV
CTRL1, 2 Input Currents
CTRL1 = 100mV, CTRL2 = 1.25V or
40
nA
CTRL2 = 100mV, CTRL1 = 1.25V (Current Out of Pin)
OVPSET Input Current
OVPSET = 1V, V OUT = 41V (Current Out of Pin)
200
nA
PWM Switching Threshold
V C Pin Current in PWM Mode
OUT Pin Current in PWM Mode
SS Low Level (V OL )
SS Reset Threshold
SS High Level (V OH )
Soft-Start (SS) Pin Charge Current
Soft-Start (SS) Pin Discharge Current
V C = 1V, PWM = 0
PWM = 0
I (SS) = 20μA
V C = 0V
V C = 0V
SS = 1V, Current Out of Pin, V C = 0V
SS = 0.5V, V C = 0V
0.8
1
1
1
0.15
0.25
1.5
12
350
1.2
50
100
V
nA
nA
V
V
V
μA
μA
34781f
3
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