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STP1612PW05 bảng dữ liệu(PDF) 21 Page - STMicroelectronics

tên linh kiện STP1612PW05
Giải thích chi tiết về linh kiện  16-channel LED driver with 16-bit PWM, 8-bit gain and full LED error detection
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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STP1612PW05 bảng dữ liệu(HTML) 21 Page - STMicroelectronics

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STP1612PW05
Setting output current
Doc ID 15819 Rev 4
21/35
11
Setting output current
The output current (IOUT) is set by an external resistor, Rext.
It is calculated from the equation:
VR-EXT = 1.24 x G; IOUT = (VR-EXT/Rext) x 560
Whereas Rext is the resistance of the external resistor connected to R-EXT terminal
and VR-EXT is its voltage. G is the digital current gain, which is set by the bit9 – bit2 of the
configuration register. The default value of G is 1. For your information, the output current is
about 20 mA when Rext = 34.70 kΩ and 10 mA when Rext = 69.6 kΩ if G is set to
default value 1. The formula and setting for G are described in next section.
Figure 12.
Rext vs output current
Table 15.
Rext vs output current (1)
1.
TA = 25 °C, Vdd = 3.3 V; 5.0 V, VLed = 3.0 V, Vdrop = 1.5 V, HC = 0101011 (default)
Iout (mA)
Rext (k
Ω)
3
238.2
5
142.2
10
69.6
20
34.70
30
22.94
50
13.72
60
11.40
80
8.63
0
25
50
75
100
125
150
175
200
225
250
275
3
5
10
20
30
50
60
80
Iout (mA)



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