MAX16821BEVKIT+ Maxim Integrated Products, MAX16821BEVKIT+ Datasheet - Page 21

• Manufacturer Part Number: MAX16821BEVKIT+
• Description: KIT EVAL FOR MAX16821B
• Manufacturer: Maxim Integrated Products

Specifications of MAX16821BEVKIT+

• Current - Output / Channel: 660mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 28V
• Features: Dimmable
• Voltage - Input: 7 ~ 24V
• Utilized Ic / Part: MAX16821
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 11. Boost LED Driver with PWM Dimming
Calculate power dissipation in the MAX16821A/
MAX16821B/MAX16821C as a product of the input volt-
age and the total V
I
rent (I
CC
PWM DIM
includes quiescent current (I
DD
PWM DIM
):
R10
V
I
CC
CC
Q4
= I
______________________________________________________________________________________
Q
Q5
Q3
C10
C9
CC
P
+ [f
C11
D
= V
regulator output current (I
SW
C8
R7
R6
IN
V
R5
x (Q
LED
x I
R8
R9
Power Dissipation
CC
G1
Drivers with Rapid Current Pulsing
Q
) and gate-drive cur-
+ Q
18
15
16
17
19
20
21
High-Power Synchronous HBLED
CLP
OVI
DIFF
EAOUT
EAN
CSN
CSP
G2
SGND
14
I.C.
22
)]
SENSE- SENSE+
OUTV
13
R3
23
RT/SYNC
CC
C3
12
24
).
MAX16821A
MAX16821B
MAX16821C
R4
SGND
V
EN
11
25
CC
where Q
low-side and high-side external MOSFETs at V
5V, I
frequency of the LED driver.
Use the following equation to calculate the maximum
power dissipation (P
ent temperature (T
V
C7
IN
MODE
Q
10
26
IN
is the supply current, and f
C6
G1
CLKOUT
ON/OFF
V
27
9
CC
and Q
P
DMAX
C5
SGND
V
PGND
28
8
DD
N.C.
N.C.
BST
A
LX
DL
DH
G2
):
= 34.5 x (150 – T
DMAX
4
7
6
5
3
2
1
are the total gate charge of the
) in the chip at a given ambi-
L1
7V TO 28V
Q1
R1
V
D1
IN
SW
A
) mW
PWM DIM
C1
C2
is the switching
R2
V
LED
Q2
GATE
LED
STRING
21
=