Rainbow Electronics MAX16834 - Manual (Page 4)

MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V IN = V HV = 12V, V UVEN = 5V, V LV = V PWMDIM = SGND, C VCC = 4.7µF, C LCV = 100nF, C REF = 100nF, R SENSE+ = 0.1
Ω,
R RT = 10k
Ω, T
A = T J = -40°C to +125°C, unless otherwise noted. Typical values are at T A = +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CURRENT PEAK LIMIT COMPARATOR
Trip Threshold Voltage 0.25 0.3 0.35 V
Propagation Delay 50mV overdrive with respect to NDRV 40 ns
OVERVOLTAGE PROTECTION INPUT (OVP+)
OVP+ On Threshold Voltage V OVP_ON 1.375 1.435 1.495 V
OVP+ Hysteresis 200 mV
OVP+ Input Leakage Current (V OVP - V LV ) = 1.235V -1 +1 µA
HIGH-SIDE LED SHORT COMPARATOR
Off Threshold V CLV - V LV 4.0 4.3 4.6 V
On Threshold V CLV - V LV 4.1 4.4 4.7 V
Error Reject Blankout f OSC = 500kHz 256 µs
LOW-SIDE LED SHORT COMPARATOR
Off Threshold 0.27 0.30 0.33 V
Error Reject Blankout 5 µs
HICCUP TIMER
Hiccup Time f OSC = 500kHz 8.2 ms
GATE-DRIVER OUTPUT (NDRV)
NDRV Peak Pullup Current V CC = 7V 3 A
NDRV Peak Pulldown Current V CC = 7V 3 A
p-Channel MOSFET R DSON (V CC - V NDRV ) = 0.1V 1.2 1.9 Ω
n-Channel MOSFET R DSON V NDRV = 0.1V 0.9 1.7 Ω
DIMOUT
DIMOUT Peak Pullup Current (V
CLV
- V
LV
) = 5V 25 50 mA
DIMOUT Peak Pulldown Current (V CLV - V LV ) = 5V 25 50 mA
p-Channel MOSFET R DSON (V CLV - V DIMOUT ) = 0.1V 31 Ω
n-Channel MOSFET R DSON (V DIMOUT - V LV ) = 0.1V 25 Ω
PWMDIM to DIMOUT
Propagation Delay
200 ns
FAULT FLAG ( FLT)
FLT Pulldown Current V FLT = 0.2V 2 5 10 mA
FLT Leakage Current V FLT = 1.0V I1I µA
Thermal Warning On Threshold +140 °C
Thermal Warning Threshold
Hysteresis
20 °C
Note 2: Dropout voltage is defined as V
IN
- V
CC
, when V
CC
is 100mV below the value of V
CC
for V
IN
= 9.5V.
Note 3: Dropout is defined as V
HV
- V
CLV
, when V
CLV
is 100mV below the value of V
CLV
for V
HV
= 8V.
Note 4: Not production tested. Guaranteed by design.