Rainbow-electronics MAX16834 Manual de usuario descargar pdf (Pagina 3)

MAX16834

High-Power LED Driver with Integrated High-Side LED

Current Sense and PWM Dimming MOSFET Driver

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OSCILLATOR

RT/SYNC

= 5kΩ 0.9 1 1.1 MHz

Oscillator Frequency f

OSC

RT/SYNC

= 25kΩ 180 200 220 kHz

Oscillator Frequency Range (Note 4) 100 1000 kHz

External Sync Input Clock High

Threshold

(Note 4) 2 V

External Sync Input Clock Low

Threshold

(Note 4) 0.4 V

External Sync Input High Pulse

Width

(Note 4) 200 ns

Maximum External Sync Period 50 µs

SLOPE COMPENSATION (SC)

SC Pullup Current I

SCPU

= 100mV 80 100 120 µA

SC Discharge Resistance R

SCD

= 100mV 8 Ω

REFI

REFI Input Bias Current V

REFI

= 1V I1I µA

REFI Input Common-Mode Range (Note 4) 0 2 V

SENSE+

SENSE+ Input Bias Current (V

SENSE+

- V

) = 100mV 250 µA

HIGH-SIDE LED CURRENT-SENSE AMPLIFIER (V

SENSE+

- V

)

Input Offset Voltage V

> 5V, (V

SENSE+

- V

) = 5mV -2.4 0 +2.4 mV

Voltage Gain A

> 5V, (V

SENSE+

- V

) = 0.2V 9.7 9.9 10.1 V/V

SENSE+

- V

) = 0.1V, no load 1.8 MHz

3dB Bandwidth

SENSE+

- V

) = 0.02V, no load 600 kHz

LOW-SIDE LED CURRENT-SENSE AMPLIFIER

Input Offset Voltage V

< 1V, (V

SENSE+

- V

) = 0V -2 0 +2 mV

Voltage Gain A

< 1V, (V

SENSE+

- V

) = 0.2V 9.7 9.9 10.1 V/V

3dB Bandwidth 600 kHz

CURRENT ERROR AMPLIFIER (TRANSCONDUCTANCE AMPLIFIER)

Transconductance g

COMP

= 2V, V

PWMDIM

= 5V 400 500 600 µS

Open-Loop DC Gain A

60 dB

Input Offset Voltage -10 0 +10 mV

COMP Voltage Range V

COMP

(Note 4) 0.4 2.5 V

PWM COMPARATOR

Input Offset Voltage 0.6 0.65 0.70 V

Propagation Delay t

50mV overdrive 40 ns

Minimum On-Time t

ON(MIN)

On-time includes blanking time 100 ns

Duty Cycle (Note 4) 90 99.5 %

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.)

1 2 3 4 5 6 7 8 ... 21 22

MAX16834 1

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Rainbow-electronics MAX16834 Manual de usuario Pagina 3

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