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SC604EVB bảng dữ liệu(PDF) 10 Page - Semtech Corporation

tên linh kiện SC604EVB
Giải thích chi tiết về linh kiện  Low Noise, High Efficiency Regulated White LED Driver
PDF  18 Pages
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SC604EVB bảng dữ liệu(HTML) 10 Page - Semtech Corporation

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10
 2005 Semtech Corp.
www.semtech.com
SC604A
POWER MANAGEMENT
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Table 3 - Analog Voltage for LED Current Control
Figure 1 - Analog Voltage for LED Current Control
Figure 2 - 3 Bit LED Current Control with Open Drain
Method 2. The example circuit in Figure 1 uses a 16.5k
Ω resistor
and an analog input DC voltage, V
ADJ , which varies from 1.2V to 0V
to control LED current from 1mA to 30mA. Table 3 shows the
resulting output. If necessary, the analog V
ADJ voltage can be
sourced from a voltage higher than 1.2V, but the source must be
divided down so that the V
ADJ mode will not exceed 1.2V. For lower
current applications and for higher resolution, a larger resistor
may be substituted in this circuit. PWM applications are also
possible with this circuit by application of RC filtering. (Consult
with Semtech for detailed application support).
Methods for Setting LED Current (Cont.)
Method 3. The circuit in Figure 2 uses open drain NMOS transistors
to set an equivalent resistance for R
SET. Parallel combinations are
switched on and off for R1, R2 and R3. R4 is always connected,
so that a minimum value of LED current can be maintained at
1.5mA.



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