MAX16831
High-Voltage, High-Power LED Driver with
Analog and PWM Dimming Control
4
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
UVEN
= 14V, C
REG1
= 1µF, C
REG2
= 1µF, C
CLMP
= 0.1µF, R
T
= 25kΩ, T
A
= T
J
= -40°C to +125°C, unless otherwise noted.
Typical specifications are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ERROR AMPLIFIER
FB Input Bias Current -100 +100 nA
EAMP Output Sink Current V
FB
= 1.735V, V
COMP
= 1V 3 7 mA
EAMP Output Source Current V
FB
= 0.735V, V
COMP
= 1V 2 7 mA
EAMP Input Common-Mode
Voltage
0 3.0 V
EAMP Output Clamp Voltage 1.1 1.7 2.4 V
Voltage Gain A
V
R
COMP
= 100kΩ to AGND 80 dB
Unity-Gain Bandwidth GBW
R
COMP
= 100kΩ to AGND, C
COMP
= 100pF
to AGND
0.5 MHz
OSCILLATOR, OSC SYNC, CLK, AND CLKOUT
f
SWMIN
125
RTSYNC Frequency Range
f
SWMAX
500
kHz
R
T
= 25kΩ 475 500 525
RTSYNC Oscillator Frequency
R
T
= 100kΩ 106 125 143
kHz
RTSYNC High-Level Voltage V
SIHL
2.8 V
RTSYNC Low-Level Voltage V
SILL
0.4 V
CLKOUT High Level I
SINK
= 0.8mA 2.8 V
CLKOUT Low Level I
SOURCE
= 1.6mA 0.4 V
CLKOUT Maximum Load
Capacitance
C
CLK_CAP
f
SW
= 500kHz 500 pF
DIM SYNC, DIM RAMP, AND DIM PWM GEN
Internal Ramp Frequency f
RAMP
160 200 240 Hz
External Sync Frequency Range f
DIM
80 2000 Hz
External Sync Low-Level Voltage V
LTH
0.4 V
External Sync High-Level Voltage V
HTH
3.2 V
DIM Comparator Offset V
DIMOS
170 200 300 mV
DIGITAL SOFT-START
Soft-Start Duration t
SS
4.0 ms
OVERVOLTAGE COMPARATOR, LOAD OVERCURRENT COMPARATOR
OVP Overvoltage Comparator
Threshold
V
OV
V
OV
rising 1.20 1.235 1.27 V
OVP Overvoltage Comparator
Hysteresis
V
OV_HYST
63.5 mV
SLOPE COMPENSATION
Slope Compensation Peak
Voltage Per Cycle
Clock generated by R
T
120 mV
Slope Compensation External clock applied to RTSYNC 15 mV/µs
