Rainbow-electronics MAX16834 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX16834

High-Power LED Driver with Integrated High-Side LED

Current Sense and PWM Dimming MOSFET Driver

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= V

= 12V, V

UVEN

= 5V, V

= V

PWMDIM

= SGND, C

VCC

= 4.7µF, C

LCV

= 100nF, C

REF

= 100nF, R

SENSE+

= 0.1Ω,

= 10kΩ, T

= T

= -40°C to +125°C, unless otherwise noted. Typical values are at T

= +25°C.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

CURRENT PEAK LIMIT COMPARATOR

Trip Threshold Voltage 0.25 0.3 0.35 V

Propagation Delay 50mV overdrive with respect to NDRV 40 ns

OVERVOLTAGE PROTECTION INPUT (OVP+)

OVP+ On Threshold Voltage V

OVP_ON

1.375 1.435 1.495 V

OVP+ Hysteresis 200 mV

OVP+ Input Leakage Current (V

OVP

- V

) = 1.235V -1 +1 µA

HIGH-SIDE LED SHORT COMPARATOR

Off Threshold V

CLV

- V

4.0 4.3 4.6 V

On Threshold V

CLV

- V

4.1 4.4 4.7 V

Error Reject Blankout f

OSC

= 500kHz 256 µs

LOW-SIDE LED SHORT COMPARATOR

Off Threshold 0.27 0.30 0.33 V

Error Reject Blankout 5µs

HICCUP TIMER

Hiccup Time f

OSC

= 500kHz 8.2 ms

GATE-DRIVER OUTPUT (NDRV)

NDRV Peak Pullup Current V

= 7V 3 A

NDRV Peak Pulldown Current V

= 7V 3 A

p-Channel MOSFET R

DSON

- V

NDRV

) = 0.1V 1.2 1.9 Ω

n-Channel MOSFET R

DSON

NDRV

= 0.1V 0.9 1.7 Ω

DIMOUT

DIMOUT Peak Pullup Current (V

CLV

- V

) = 5V 25 50 mA

DIMOUT Peak Pulldown Current (V

CLV

- V

) = 5V 25 50 mA

p-Channel MOSFET R

DSON

CLV

- V

DIMOUT

) = 0.1V 31 Ω

n-Channel MOSFET R

DSON

DIMOUT

- V

) = 0.1V 25 Ω

PWMDIM to DIMOUT

Propagation Delay

200 ns

FAULT FLAG (FLT)

FLT Pulldown Current V

FLT

= 0.2V 2 5 10 mA

FLT Leakage Current V

FLT

= 1.0V I1I µA

Thermal Warning On Threshold +140 °C

Thermal Warning Threshold

Hysteresis

20 °C

Note 2: Dropout voltage is defined as V

- V

, when V

is 100mV below the value of V

for V

= 9.5V.

Note 3: Dropout is defined as V

- V

CLV

, when V

CLV

is 100mV below the value of V

CLV

for V

= 8V.

Note 4: Not production tested. Guaranteed by design.

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MAX16834 1

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