MAX16815 데이터 시트보기 (PDF) - Maxim Integrated

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MAX16815

High-Voltage, 100mA/200mA Adjustable Linear High-Brightness LED Drivers with PWM Dimming

Maxim Integrated 

MAX16815/MAX16828

High-Voltage, 100mA/200mA Adjustable Linear

High-Brightness LED Drivers with PWM Dimming

SO Functional Diagram

DIM

IN

1.2V

EN

BANDGAP

AND 5V

V5

REGULATOR

THERMAL

SHUTDOWN

GND

MAX16815

MAX16828

0.8A

IREG

DIFF

AMP

P

OUT

CS+

CS-

Detailed Description

+5V Regulator

The MAX16815/MAX16828 include a fixed +5V output

regulator that delivers up to 4mA of load current through-

out the 6.5V to 40V input voltage range. Connect a 0.1µF

compensation capacitor from V5 to ground. Shorting V5

to ground disables the thermal shutdown. V5 stays on

during PWM dimming.

Thermal Protection

The MAX16815/MAX16828 enter a thermal-shutdown

mode in the event of overheating. This typically occurs

in overload or output short-circuit conditions. If the

junction temperature exceeds TJ = +159°C (typ), the

internal thermal-protection circuitry turns off the series

pass device. The MAX16815/MAX16828 recover from

thermal-shutdown mode once the junction tempera-

ture drops by 24°C (typ). The devices therefore protect

themselves by thermal cycling in the event of a short-

circuit or overload condition. Shorting V5 to ground

disables the thermal shutdown.

Applications Information

Programming the LED Current

The MAX16815/MAX16828 use a sense resistor across

CS+ and GND for the TDFN package or across CS+ and

CS- for the SO package, to set the LED current. The LED

current is given by ILED = VRSNS/RSENSE.

Input-Voltage Considerations

For proper operation, the minimum input voltage must

always be:

VIN(MIN) ≥ VRSNS(MAX) + VFT(MAX) + ∆VDO(MAX)

where VFT(MAX) is the total forward voltage of all series

connected LEDs. The minimum operating voltage of

the device is +6.5V. The device operates below +6.5V;

however, output current may not meet the full regulation

specification (see the Typical Operating Characteristics)

and the V5 regulator will drop below 5V.

Low-Frequency PWM Dimming

at the Output

Provide a pulse to the dimming input (DIM) of the

MAX16815/MAX16828 to produce a PWM output.

Alternatively, connect DIM to IN and pulse IN.

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