LED1642GW datasheet(30/42 Pages) STMICROELECTRONICS

部件名	LED1642GW

功能描述	16 channel LED driver with error detection current gain control

PDF	42 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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30 / 42 page

Dropout voltage

LED1642GW

30/42

DocID024395 Rev 6

Dropout voltage

In order to correctly regulate the channel current, a minimum output voltage (VDROP) across

each current generator must be guaranteed.

The Figure 26 and Table 12 show the minimum VDROP related to the regulated current;

these measurements have been recorded with just one output ON. When more than one

output is active the drop voltage increases. At 36 mA per channel, the minimum output

voltage must be increased about 200 mV.

A VDROP, lower than the minimum recommended, implies the regulation of a current lower

than the expected one. However an excess of VDROP increases the power dissipation.

Figure 26. Typical channel dropout voltage vs. output current (VDD = 3.3 V)

Table 12. Minimum dropout voltage for some current values

Output current [mA]

Minimum VDROP @ VDD = 3.3 V [mV]

370

9180

250

410

730

820

955

1070

AM13707V1

200

400

600

800

1000

1200

IOUT [mA]

Drop vs. IOUT @ VDD = 3.3 V, T= 25°C

(only one channel ON)

LED1642GW 数据表(PDF) 30 Page - STMicroelectronics

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