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High-Power Synchronous HBLED
Drivers with Rapid Current Pulsing
High-Side Buck Driver
with Synchronous Rectification
In Figure 9, the input voltage goes from 7V to 28V, the LED
load is connected from the positive side to the current-
sense resistor (R1) in series with the inductor, and MODE
is connected to V CC . For the inner average current-loop
inductor, current is sensed by resistor R1 and is then
transferred to the low side by the high-side current-sense
amplifier, U2. The voltage appearing across resistor R11
becomes the average inductor current-sense voltage for
the inner average current loop. To regulate the LED
current, R2 creates a voltage that the differential ampli-
fier compares to its internal reference. Capacitor C1 is
small and is added to reduce the ripple current in the
LEDs. In cases where the LEDs can tolerate a higher
ripple current, capacitor C1 can be omitted.
V CC
R4
ON/OFF
C3
R3
V IN
14
13
12
11
10
9
8
7V TO 28V
C11
I.C.
OUTV
RT/SYNC
EN
MODE
CLKOUT
SGND
C10
R8
15 OVI
16 CLP
I.C.
N.C. 7
DH 6
C2
Q1
C1
LED
STRING
R7
17 EAOUT
LX 5
L1
C9
C8
R6
18 EAN
MAX16821A
MAX16821B
MAX16821C
BST 4
R5
D1
C4
R1
V CC
RS+
U2
R2
19 DIFF
20 CSN
DL 3
N.C. 2
Q2
RS-
OUT
R11
21 CSP
PGND 1
SGND
22
SENSE-
23
SENSE+
24
SGND
25
IN
26
V CC
27
V DD
28
V IN
C7
C6
C5
Figure 9. Application Circuit for a High-Side Buck LED Driver
______________________________________________________________________________________
17
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