MAX16805 データシートの表示（PDF） - Maxim Integrated
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MAX16805
Maxim Integrated
MAX16805 Datasheet PDF : 18 Pages
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MAX16805/MAX16806
EEPROM-Programmable, High-Voltage,
350mA LED Drivers with LED Current Foldback
Typical Operating Characteristics (continued)
(VIN = 12V, VEN = VIN, CV5 = 0.1μF, IV5 = 0, CS- = GND, RSENSE = 0.56Ω, connect OUT to CS+, VDIM = 4V, SW = VFD = open,
VTFP/SC = 5V, VTFN/SD = GND, DGND = GND. TA = +25°C, unless otherwise noted.)
LED CURRENT FALL TIME (EXPANDED)
MAX16805 toc10
DIM PULSED AT
200Hz
VDIM
2V/div
0V
LED CURRENT RISE TIME (EXPANDED)
MAX16805 toc11
DIM PULSED AT
200Hz
VDIM
2V/div
0V
ILED
200mA/div
0A
ILED
200mA/div
0A
OUTPUT CURRENT DUTY CYCLE
vs. ANALOG DIM VOLTAGE
120
VIN = 12V
100 RAMP REGISTER = 0x07
CFD = GND
TFP = 5V
80 TFN = GND
60
40
20
20µs/div
OUTPUT CURRENT
DUTY CYCLE vs. INPUT VOLTAGE
120
LED CURRENT
THRESHOLD REGISTER = (0x07)
100
20µs/div
0
0
1
2
3
4
VDIM (V)
OUTPUT CURRENT
DUTY CYCLE vs. INPUT VOLTAGE
120
LED CURRENT
THRESHOLD REGISTER = (0x00)
100
80
BIT3 = 1
60
80
BIT3 = 1
60
40
BIT3 = 0
20
40
20
BIT3 = 0
0
0 2 4 6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
OUTPUT CLAMP
vs. THERMAL FOLDBACK SLOPE
45
THERMAL SLOPE = 4V/V
40
35
THERMAL SLOPE = 4V/V
30
25
THERMAL SLOPE = 8V/V
20
THERMAL SLOPE = 12V/V
15
10
5 THERMAL FOLDBACK
CLAMP LEVEL = 40%
0
0 0.2 0.4 0.6 0.8 1.0
VTFN (V)
THERMAL
KNEE = +60°C
1.2 1.4 1.6
0
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
OUTPUT RESPONSE TO SW INPUT
MAX16805 toc16
DEBOUNCE
TIME
DEBOUNCE
TIME
VSW
5V/div
VSENSE
200mV/div
40ms/div
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