Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
Functional Diagram
IN
IN
V CC
V CC
IN
CLAMP
26.1V
BOOTSTRAP UVLO**
REGULATOR
REG_OK
V L
DIGITAL
SOFT-START
REFERENCE
1.23V
21.6V
9.74V
UVLO
UVLO
(INTERNAL 5.25V SUPPLY)
COMP
FB
1.28V
1.23V
DRIVER
CS
ERROR
AMP
V OPWM
CPWM
S
R
Q
NDRV
*OSCILLATOR
1.38V
264kHz
THERMAL
V CS
SHUTDOWN
GND
0.3V
LIM
MAX16801
MAX16802
*MAX16801A/MAX16802A: 50% MAXIMUM DUTY CYCLE
MAX16801B/MAX16802B: 75% MAXIMUM DUTY CYCLE
**MAX16801 ONLY
Selector Guide
Pin Configuration
PART
BOOTSTRAP
UVLO
STARTUP
VOLTAGE
(V)
MAX DUTY
CYCLE (%)
TOP VIEW
MAX16801A
MAX16801B
Yes
Yes
22
22
50
75
UVLO/EN 1
DIM/FB 2
8 IN
7 V CC
MAX16802A
No
10.8*
50
COMP 3
MAX16801
MAX16802
6 NDRV
MAX16802B
No
10.8*
75
* The MAX16802 does not have an internal bootstrap UVLO.
The MAX16802 starts operation as long as the V CC pin is high-
er than +7V, (the guaranteed output with an IN pin voltage of
+10.8V), and the UVLO/EN pin is high.
CS 4
μ MAX
5 GND
14
______________________________________________________________________________________
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相关代理商/技术参数
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