Rainbow-electronics MAX17127 Manual do Utilizador descarregar pdf (Página 5)

_______________________________________________________________________________________ 5

MAX17127

Six-String WLED Driver with Integrated

Step-Up Converter

ELECTRICAL CHARACTERISTICS (continued)

(Circuit of Figure 1. V

= 12V, C

COMP

= 0.51nF, C

COUT

= 4.7µF, R

COMP

= 82.5kΩ, R

ISET

= 180kΩ, R

FSLCT

= 100kΩ, L = 10µH,

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

Note 1: Specifications are guaranteed by design, not production tested.

Typical Operating Characteristics

(Circuit of Figure 1. V

= 12V, T

= +25NC, unless otherwise noted.)

PARAMETER CONDITIONS MIN TYP MAX UNITS

FB_ Minimum On-Time 400 700 ns

FAULT PROTECTION

OVP Threshold Voltage Rising edge, typical hysteresis = 90mV 1.23 1.27 V

FB_ Overvoltage Threshold 7 9 V

FB_ Open Threshold Voltage 130 280 mV

FB_ Check LED Source Current 0.4 1.3 mA

FB_ Check LED Time 0.7 1.3 ms

Overcurrent Fault Timer Latch-off timer 88 168 µs

PWM CONTROL

PWM Input On-Time 400 ns

PWM Input Frequency Range 0.1 25 kHz

BOOST CONVERTER EFFICIENCY vs. INPUT VOLTAGE (V

)

OUT

= 32V, I

OUT

= 120mA, BRIGHTNESS = 100%)

MAX17127 toc01

INPUT VOLTAGE (V)

EFFICIENCY (%)

23201714118

5 26

BOOST CONVERTER EFFICIENCY vs. BRIGHTNESS

= 2V, V

OUT

= 32V, I

OUT

= 120mA AT 100%)

MAX17127 toc02

BRIGHTNESS (%)

EFFICIENCY (%)

80604020

0 100

1 2 3 4 5 6 7 8 9 10 ... 21 22

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