Rainbow Electronics MAX16834 - Manual (Page 8)

MAX16834
High-Power LED Driver with Integrated High-Side LED
Current Sense and PWM Dimming MOSFET Driver
8 _______________________________________________________________________________________
MAX16834
AND
128 TOSC
ERROR
REJECT
DELAY
5 µs ERROR
REJECT
DELAY
4096 TOSC
HICCUP
TIMER
FLTB
SENSE+
4.3V
V LV V BG
V BG
V BG
V
BG
0.3V
0.6V
REFERENCE
OR
OT
AND
AND
AND
PWMDIM
OT
HIGH-SIDE
5V
REGULATOR
V BG
7V
LDO
RAMP
GENERATOR
PWM
COMP
OSC
BLANK
1k Ω
5k Ω
0.3V
A V = 9.9
UVLO
S
REF
IN
UVEN
RT/SYNC
SC
CS
REFI
SENSE+
COMP
HV
LV
PWMDIM
OVP+
V
CC
NDRV
PGND
FLT
CLV
DIMOUT
TO
INTERNAL
CIRCUITRY
CURRENT-LIMIT
COMPARATOR
LED CURRENT-
SENSE AMPLIFIERS
ERROR
AMPLIFIER
LV REFERENCE
SWITCH
Q
R
NDRVB
TEMPERATURE
SENSE
V LV
V LV
V LV
FLTA
FLTB
REFHI
FLTA FLTB
V LV
V
HV
V REF
V REF
LPF
V IN
V LV
REFHI
g m
NDRVB
SGND
Figure 1. Internal Block Diagram