MAX16834AGP/VY+T Maxim Integrated, MAX16834AGP/VY+T Datasheet - Page 13

• Manufacturer Part Number: MAX16834AGP/VY+T
• Description: LED Lighting Drivers High-Power LED Driver with Integrated High-Side LED Current Sense and PWM Dimming MOSFET Driver
• Manufacturer: Maxim Integrated

Specifications of MAX16834AGP/VY+T

• Input Voltage: 4.75 V to 28 V
• Maximum Supply Current: 10 mA
• Power Dissipation: 2051 mW

Figure 3. Boost-Buck LED Driver (V
ESR and the bulk capacitance are equal, allowing 50%
of the ripple for the bulk capacitance. The capacitance
is given by:
where I
hertz, and ∆V
of allowable ripple is for the ESR of the output capaci-
tor. Based on this, the ESR of the output capacitor is
given by:
where IL
Maxim Integrated
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
V
IN
LED
P
is the peak inductor current in amperes.
R1
R2
is in amperes, C
C
ESR
OUTRIPPLE
OUT
COUT
C1
≥
∆
V
I
LED
<
OUTRIPPLE
is in volts. The remaining 50%
∆
V
× ×
R5
C2
R3
C5
C4
OUTRIPPLE
OUT
2
(
IL
LED+
P
D
is in farads, f
×
MAX
×
R6
< 28V)
) 2
f
SW
( )
FLT
LV
IN
UVEN
SC
RT/SYNC
V
REF
REFI
SGND
Ω
CC
MAX16834
SW
is in
PWMDIM
DIMOUT
SENSE+
COMP
NDRV
OVP+
PGND
CLV
HV
CS
Use the below equation to calculate the RMS current
rating of the output capacitor:
The input filter capacitor bypasses the ripple current
drawn by the converter and reduces the amplitude of
high-frequency current conducted to the input supply.
The ESR, ESL, and the bulk capacitance of the input
capacitor contribute to the input ripple. Use a low-ESR
input capacitor that can handle the maximum input
RMS ripple current from the converter.
For the boost configuration, the input current is the
same as the inductor current. For boost-buck
I
COUT(RMS)
ON
R7
C7
OFF
Q1
C6
=
L1
R8
D1
(IL
+
(
C3
IL
AVG
A
V V G
×
×
MAX16834
(1 D
D
-
R4
R9
Q2
MAX
MAX
Input Capacitor
)
2
))
×
R10
2
(
1 -
LED+
×
LED-
D
D
LEDs
MAX
C8
MAX
V
IN
)
13