MAX16834_15 Datasheet, PDF (6/23 Pages) Maxim Integrated Products – High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver

MAX16834
High-Power LED Driver with Integrated
High-Side LED Current Sense and
PWM Dimming MOSFET Driver
Typical Operating Characteristics (continued)
(V_IN = V_HV = 12V, V_UVEN = 5V, V_LV = V_PWMDIM = V_SGND, C_VCC = 4.7μF, C_LCV = 100nF, C_REF = 100nF, R_SENSE+ = 0.1Ω,
R_RT = 10kΩ, T_A = +25°C, unless otherwise noted.)
NDRV RISE/FALL TIME
VCC vs. VIN
vs. CAPACITANCE
7.20
7.18 _{TA = +125°C} T_A = +25°C T_A = -40°C
50
VIN = 12V
7.16
40
7.14
7.12
30
7.10
RISE TIME
7.08
20
FALL TIME
7.06
7.04
10
7.02
7.00
6
10 14 18 22 26
VIN (V)
0
0 1 2 3 4 5 6 7 8 9 10
CAPACITANCE (nF)
VCLV vs. ICLV
5.50
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50 _{VIN = 12V}
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
ICLV (mA)
Pin Description
5.10
5.09
5.08
5.07
5.06
5.05
5.04
5.03
5.02
5.01
5.00
6
VCLV vs. VHV
VIN = 12V
10 14 18 22 26
VHV (V)
PIN
QFN, TQFN TSSOP
1
3
2
4
3
5
4
6
5
7
6
8
NAME
FUNCTION
OVP+
SGND
COMP
REF
REFI
SC
LED-String Overvoltage Protection Input. Connect a resistive voltage-divider between the
positive output, OVP+, and LV to set the overvoltage threshold. OVP+ has a 1.435V threshold
voltage with a 200mV hysteresis.
Signal Ground
Error-Amplifier Output. Connect an RC network from COMP to SGND for stable operation. See
the Feedback Compensation section.
3.7V Reference Output Voltage. Bypass REF to SGND with a 0.1μF to 0.22μF ceramic
Current Reference Input. V_REFI provides a reference voltage for the current-sense amplifier to
set the LED current.
Current-Mode Slope Compensation Setting. Connect to an appropriate external capacitor from
SC to SGND to generate a ramp signal for stable operation.
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