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MAX16801B Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX16801B
Description  Off-Line and DC-DC PWM Controllers for High-Brightness LED Drivers
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX16801B Datasheet(HTML) 11 Page - Maxim Integrated Products

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Off-Line and DC-DC PWM Controllers for
High-Brightness LED Drivers
______________________________________________________________________________________
11
MAX16801
VSUPPLY
IN
VOUT
VCC
R1
R6
R5
C1
C2
C3
C4
LEDs
Q1
D1
T1
R7
R4
R3
D2
R2
CS
NDRV
COMP
GND
DIM/FB
UVLO/EN
GND
Figure 5. Off-line Nonisolated Flyback LED Driver with Programmable Input-Supply Start Voltage
Application Circuits
Figure 5 shows an off-line application of a HB LED dri-
ver using the MAX16801. The use of transformer T1
allows significant design flexibility. Use the internal
error amplifier for a very accurate LED current control.
Figure 6 shows a discontinuous flyback LED driver with
linear dimming capability. The total LED voltage can be
lower or higher than the input voltage.
Figure 7 shows a continuous conduction mode HB LED
buck driver with linear dimming and just a few external
components.
Figure 8 shows an off-line isolated flyback HB LED dri-
ver with low-frequency PWM using MAX16801. The
PWM signal needs to be inverted (see the Functional
Diagram). Transformer T1 provides full safety isolation
and operation from universal AC line (85VAC to
265VAC).


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