MAX16818_09 Datasheet, PDF (14/25 Pages) Maxim Integrated Products – 1.5MHz, 30A High-Efficiency, LED Driver with Rapid LED Current Pulsing

1.5MHz, 30A High-Efficiency, LED Driver
with Rapid LED Current Pulsing
Functional Diagram
V_CC
I_S
EN
0.5V x V_CC
IN
5V
LDO
UVLO
POR
REGULATOR
TEMP SENSOR
V_CC
TO INTERNAL
LIM
CIRCUITS
HICCUP MODE
CURRENT LIMIT
MAX16818
V_CM
126.7kΩ
100kΩ
S
Q
CLP
CSP
CSN
V_IOUT
A_V = 4
SGND
RT/SYNC
OSCILLATOR
0.5 x V_CLAMP
A_V = 34.5
CA
g_m = 500µS
CEA
V_CM
PWM
COMPARATOR
V_CLAMP
LOW
V_CLAMP
HIGH
RAMP ^CPWM
2 x f_S (V/s)
CLK
CLKOUT
DIFF
SENSE-
DIFF
SENSE+ ^AMP
+0.6V
RAMP
GENERATOR
EAOUT
EAN
ERROR AMP
VEA
SOFT-
START
V_REF = 0.6V
V_CM (0.6V)
R_T
R
Q
C_t
S
Q
R
Q
N
0.1 x V_REF
0.12 x V_REF
OVP LATCH
LATCH
OVP COMP
CLEAR ON UVLO RESET OR
ENABLE LOW
OVI
V_DD
BST
DH
LX
DL
PGND
PGOOD
Figure 6. MAX16818 Functional Diagram
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