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EEPROM-Programmable, High-Voltage, 350mA
LED Drivers with LED Current Foldback
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V EN = 12V, C V5 = 0.1μF, I V5 = 0, CS- = GND, R SENSE = 0.56 Ω , V DIM = 4V, DGND = GND, TFP/SCL = 5V, TFN/SDA = 0V,
SW = CFD = Open, T A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.) (Note 1)
PARAMETER
Maximum Thermal Foldback
Clamp Current Reduction Range
Default Thermal Foldback Clamp
Current Reduction Range
SYMBOL
TF C(MAX)
TF DEF
CONDITIONS
+25 o C ≤ T A ≤ +125 o C
Thermal Foldback Clamp register at
factory default (0x07),
+25 o C ≤ T A ≤ +125 o C
MIN
TYP
100
40
MAX
UNITS
%
%
THERMAL PROTECTION
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
T J(SHDN)
+155
+23
°C
°C
LED CURRENT FOLDBACK
Minimum Input LED Current
Foldback Range
Maximum Input LED Current
Foldback Range
V CFD(MIN)
V CFD(MAX)
11.4
16.4
V
V
LED Current Foldback Default
Level
LED Current Foldback Voltage
Step Size
V CFD
LED Current Foldback Threshold register
at factory default (0x00)
V IN > 11V, CFD register bit 3 = 0
V IN > 11V, CFD register bit 3 = 1
16.4
0.71
0.355
V
V/step
INTERNAL RAMP GENERATOR
Internal RAMP Frequency
External Sync Frequency Range
f RAMP
f DIM
176
80
200
224
2000
Hz
Hz
External Sync Voltage Low
External Sync Voltage High
V DIM = 0V
2.8
0
0.4
V
V
Output Current Duty Cycle
I DC
V DIM > (V RAMP + 0.4V) (MAX16806),
V DIM > +3.3V (MAX16805)
100
%
Minimum Ramp Peak
Programming Range
Maximum Ramp Peak
Programming Range
Ramp Peak Default Voltage
V RAMP(MIN)
V RAMP(MAX)
Ramp Peak register at factory default
(0x07)
1.49
2.77
1.55
2.88
2.88
1.60
3.00
V
V
V
Ramp Offset Voltage
MOMENTARY SWITCH INTERFACE (SW) (MAX16806)
210
mV
SW Pullup Current
SW Input-Voltage High
SW Input-Voltage Low
I SW
V IH
V IL
V SW = 0V
I SW = 100μA
1
4
3
0.4
mA
V
V
Minimum Pulse Width
Minimum Debounce Time
120
40
ms
ms
4
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