MAX16801A データシートの表示（PDF） - Maxim Integrated

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MAX16801A

Offline and DC-DC PWM Controllers for High-Brightness LED Drivers

Maxim Integrated 

Offline and DC-DC PWM Controllers for

High-Brightness LED Drivers

Application Circuits

Figure 5 shows an offline application of an 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 offline 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).

VSUPPLY

R1

C1

GND

IN

VCC

C2

C3

COMP

R6

DIM/FB

R2

NDRV

CS

MAX16801

GND

UVLO/EN

R3

R5

D1

T1

D2

C4

Q1

R4

Figure 5. Offline, Nonisolated, Flyback LED Driver with Programmable Input-Supply Start Voltage

VOUT

LEDs

R7

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