MAX16801A_10 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – Offline and DC-DC PWM Controllers for High-Brightness LED Drivers

Offline and DC-DC PWM Controllers for
High-Brightness LED Drivers
OPTIONAL ONLY WHEN PWM DIMMING IS USED
T1
D3
D1
C4
D2
R2
R1
V_CC
NDRV
Q1
LEDs
UNIVERSAL
BRIDGE
C3
AC INPUT ^RECTIFIER
IN
GND
C6
C1
C2
MAX16801B
CS
*PWM
DIM/FB
UVLO/EN
R4
R3
C5
*WARNING: PWM DIMMING SIGNAL IS SHOWN AT THE PRIMARY SIDE.
USE AN OPTOCOUPLER FOR SAFETY ISOLATION OF THE PWM SIGNAL.
Figure 8. Universal AC Input, Offline, Isolated Flyback HB LED Driver with Low-Frequency PWM Dimming
D1
T1
+VIN
U2
OPTO TRANS
R1
C1
R5
R2
IN
NDRV
VCC
CS
R7
MAX16801
COMP
GND
DIM/FB
UVLO/EN
D3
Q1
VOUT
U2
OPTO LED
R8
C4
R4
R11
C3
R9
Z1
U3
TLV431
R6
C2
GND
R3
C5
R10
Figure 9. Universal Input, Offline, High-Accuracy Current Regulation in an Isolated Flyback HB LED Driver
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