Rainbow Electronics MAX17127 - Manual (Page 3)

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MAX17127
Six-String WLED Driver with Integrated
Step-Up Converter
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1. V IN = 12V, C COMP = 0.51nF, C COUT = 4.7µF, R COMP = 82.5kΩ, R ISET = 180kΩ, R FSLCT = 100kΩ, L = 10µH,
T A = 0°C to +85°C, unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
FPO OUTPUT
FPO Off-Leakage Current Fault inactive, T
A = +25NC 100 nA
FPO On Output-Voltage
Low
I SINK = 1mA, fault active 0.4 V
INPUT LEAKAGE
PWM Leakage Current
T A = +25NC, V PWM = 0V, V PWM = 5V -1 +1 F A
OVP Leakage Current T A = +25NC, V OVP = 0V, V OVP = 5V -0.1 +0.1 F A
LED CURRENT
Full-Scale FB_ Output
Current
R ISET = 120kI 29.1 30 30.9
mA
R ISET = 180kI 19.6 20 20.4
R ISET = 360kI 9.7 10 10.3
V ISET < 0.7V 0.2 0.3 0.4
R ISET Range
Operating range 100 400
kI
Accuracy = 3% 120 360
Current Regulation
Between Strings
10mA < I FB _< 30mA -2.0 +2.0 %
Minimum FB_ Regulation
Voltage
I FB _ = 30mA 400 555 770
mV I FB _ = 20mA 460 670
I FB _ = 10mA 350 630
FB_ On-Resistance V FB _ = 50mV (includes 10I sense resistor) 17.5 28.4 I
FB_ Bias Current V FB _ = 40V, T A = +25NC 0.1 1 F A
FB_ Minimum On-Time 400 580 700 ns
FAULT PROTECTION
OVP Threshold Voltage
Rising edge, typical hysteresis = 90mV 1.23 1.25 1.27 V
FB_ Overvoltage
Threshold
7 8 9 V
FB_ Enable Threshold
Voltage
1.2 V
FB_ Open Threshold
Voltage
130 280 mV
FB_ Check LED Source
Current
0.4 1.3 mA
FB_ Check LED Time 0.7 1.0 1.3 ms
Thermal-Shutdown
Threshold
(Note 1) +150 N C
Overcurrent Fault Timer Latch-off timer 128
F
s
PWM CONTROL
PWM Input On-Time
400 ns
PWM Input Frequency
Range
0.1 25 kHz