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參數(shù)資料
| 型號： | I7110-EP |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | 300 Mbps LED Drivers |
| 中文描述： | 300 Mbps的LED驅(qū)動器 |
| 文件頁數(shù)： | 10/17頁 |
| 文件大?。?/td> | 212K |
| 代理商： | I7110-EP |
i7110
Page 8
2005 iCreate Technologies Corporation
APD-8011-001
4.6 Detail Description
Bandgap
Current
M odulation
PW AP
IOUT
PEAK
RSET2
RSET1
VDDC
VDDD
VDDA
VREF
DINN
DINP
GND
GND
IOUTB
Input
Buffer
Pulse
width
Adjust
Driver
Peaking &
Clam ping
PW AN
DISA
Figure-11
The i7110 provides a flexible current drive for the
modulation of the light-emitting diodes(LEDS).
The circuit is designed to use 3.3V ~ 5V power
supply. The IC provides up to 120mA of
modulation current.
Figure-11 shows a typical block diagram of
i7110, which comprises a bandgap, current
modulation block, peaking and clamping block,
an input buffer, pulse width adjustment function
block and the output driver.
Reference-Voltage Generate
The reference-voltage generator circuit provides
single-ended input reference voltage VREF.
The VREF is used to simplify the PECL-
compatible input. For single-ended operation,
connect the input signal to DINP, and connect
DINN directly to VREF. The VREF circuit is not
designed to drive other external circuitry.
LED Drive and Temperature Compensation
The two resistors RRSET1 and RRSET2 set the
LED drive current and temperature compensation.
The simplified application diagram (Figure-11)
shows RRSET1 connects between RSET1 and
GND, and RRSET2 connects between RSET1
and RSET2.
RRSET1
RRSET2
RPEAK
CPEAK
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