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MIC2845A bảng dữ liệu(PDF) 13 Page - Micrel Semiconductor

tên linh kiện MIC2845A
Giải thích chi tiết về linh kiện  High Efficiency 6 Channel Linear WLED Driver with DAM?? Ultra Fast PWM??Control and Dual Low IQ LDOs
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nhà sản xuất  MICREL [Micrel Semiconductor]
Trang chủ  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2845A bảng dữ liệu(HTML) 13 Page - Micrel Semiconductor

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Micrel Inc.
MIC2845A
April 2010
13
M9999-041210-C
Figure 7. PWM Signal at 20% Duty Cycle (I
avg = 4mA)
Figure 8. PWM Signal at 50% Duty Cycle (Iavg = 10mA)
Figure 9. PWM Signal at 80% Duty Cycle (Iavg = 16mA)
Figure 10. PWM Signal at 100% Duty Cycle (Iavg = 20mA)
High Current Parallel Operation
Figure 11. Six Channel (Parallel) Application Circuit
The linear drivers are independent of each other and can
be used individually or paralleled to provide larger
current. A single LED can be driven with all 6 linear
drivers by connecting D1 through D6 together with the
cathode of the LED as shown in Figure 11. This will
generate a current 6 times the LED current setting and
can be used for higher current LEDs such as those used
in flash or torch applications. The current is set by the
RSET resistor, and can be calculated by the following
equation.
ILED (mA) = 6 * 410 * D / RSET (kΩ).
D is the duty cycle of the LED current during PWM
dimming. When the device is fully on the duty cycle
equals 100% (D = 1). Figure 12 shows the response
time of the six paralleled linear drivers to the enable
signal, while Figure 13 shows the turn off response. With
a RSET resistor of 1.65k, each linear driver is set to
250mA, with all 6 linear drivers connected in parallel, the
MIC2843 is capable of driving a total current of 1.5A.



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