MAX16833 Datasheet, PDF (4/22 Pages) Maxim Integrated Products – High-Voltage HB LED Drivers with Integrated High-Side Current Sense

High-Voltage HB LED Drivers with
Integrated High-Side Current Sense
ELECTRICAL CHARACTERISTICS (continued)
(VIN = 12V, RRT = 12.4kI, CIN = CVCC = 1µF, CLFRAMP/CREF = 0.1µF, NDRV = COMP = DIMOUT = PWMDIM = FLT = unconnected,
VOVP = VCS = VPGND = VSGND = 0V, VISENSE+ = VISENSE- = 45V, VICTRL = 1.40V, TA = TJ = -40NC to +125NC, unless otherwise
noted. Typical values are at TA = +25NC.) (Note 2)
PARAMETER
GATE DRIVER (NDRV)
Peak Pullup Current
Peak Pulldown Current
Rise Time
Fall Time
RDSON Pulldown nMOS
PWM DIMMING (PWMDIM)
ON Threshold
Hysteresis
Pullup Resistance
PWMDIM to LED Turn-Off Time
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
INDRVPU
INDRVPD
tr
tf
RNDRVON
VCC = 7V, VNDRV = 0V
VCC = 7V, VNDRV = 7V
CNDRV = 10nF
CNDRV = 10nF
VCOMP = 0V, ISINK = 100mA
3
A
3
A
30
ns
30
ns
0.25
0.6
1.1
I
VPWMON
1.19 1.225 1.26
V
VPWMHY
70
mV
RPWMPU
1.7
3
4.5
MI
PWMDIM falling edge to rising edge on
DIMOUT, CDIMOUT = 7nF
2
Fs
PWMDIM to LED Turn-On Time
pMOS GATE DRIVER (DIMOUT)
Peak Pullup Current
IDIMOUTPU
Peak Pulldown Current
IDIMOUTPD
DIMOUT Low Voltage with
Respect to VISENSE+
OVERVOLTAGE PROTECTION (OVP)
Threshold
VOVPOFF
Hysteresis
VOVPHY
Input Leakage
ILOVP
SHORT-CIRCUIT HICCUP MODE
Short-Circuit Threshold
VSHORT-HIC
PWMDIM rising edge to falling edge on
DIMOUT, CDIMOUT = 7nF
VPWMDIM = 0V,
VISENSE+ - VDIMOUT = 7V
VISENSE+ - VDIMOUT = 0V
VOVP rising
VOVP = 1.235V
(VISENSE+ - VISENSE-) rising
Hiccup Time
tHICCUP
3
Fs
25
50
80
mA
10
25
45
mA
-8.7 -7.4 -6.3
V
1.19 1.225 1.26
V
70
mV
-300
+300
nA
285 298
310
mV
8192
Clock
Cycles
Delay in Short-Circuit Hiccup
Activation
1
Fs
BUCK-BOOST SHORT-CIRCUIT DETECT
Buck-Boost Short-Circuit
Threshold
VSHORT-BB (VISENSE+ - VIN) falling, VIN = 12V
1.15 1.55
1.9
V
Delay in FLT Assertion from
Buck-Boost Short-Circuit
Condition
tDEL-BB-SHRT
Counter increments only when
VPWMDIM > VPWMON
8192
Clock
Cycles
Delay in FLT Deassertion After
Buck-Boost Short Circuit is
Removed (Consecutive Clock-
Cycle Count)
Counter increments only when
VPWMDIM > VPWMON
8192
Clock
Cycles
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