參數(shù)資料
型號： AK2573AVB
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 125M / 156M Laser Diode Driver + APC
中文描述： 1.25億/ 1.56 apc的激光二極管驅動器
文件頁數(shù)： 15/38頁
文件大小： 286K
代理商： AK2573AVB
ASAHI KASEI
[AK2573A]
<MS0189-E-01>
-15-
2004/5
4.1 APC_FF Function
Fig 4-2 illustrates the APC FF functions. The operation is as follows:
(1) Analog to digital conversion of the votage (7 bit) that reflects the temperature for every temperature detection
period (128ms typ).
(2) Read the 8 bit current data (address is indicated by the ADC data) from EEPROM and set this value tothe
I-DACs.
If the current data over temperature is set to each EEPROM address, the compensated current is supplied to the LD
automatically.
To use this function, current data should be stored in EEPROM in advance. The temperature sensor is cover –40
℃
to
115
℃
and EEPROM is prepared with 1.5
℃
steps.
Fig 4-2 APC FF function
ADC
(7bit)
EEPROM
I-DAC1
R_TEMP
R_DAC1_FF
Address
Data
Driver
TEMPSENS
I-DAC2
Memory for
I-DAC1
Memory for
I-DAC2
R_DAC2_FF
LD
Temperature
V
TEMPSENS
charatcteristics
BIAS Current
MOD Current
Addressing
with
R_TEMP
4.2 APC_FB Function
Fig 4-3 shows APC_FB functions. It operates as follows:
(1) APC_COMP compares vpd and vapc_ref.
(2) The digital filter calculates the compensation current (R_APC_FB) to equalize vpd with vapc_ref tokeep LD
power constant.
The vapc_ref (RE_APC_TRGT) can be changed over temperature automatically. Temperature compensation
procedure is as same as APC FF (data of DAC_APC is read out EEPROM in response to the temperature).
For the stable operation, the cut-off frequency of RPD and CPD should be 1kHz to10kHz.
Fig 4-3 APC FB function
R_APC_FB
1/N
PDGAIN
Monitor
PD
APC_
COMP
RE_APC_TRGT
PDIN
PDMON
RPD
CPD
DAC_APC
vapc_ref
1/s
EEPROM
I-DAC
R_DACx
+
comp_out
512kHz(typ)
vpd
APC FF
Digital Filter
ADC
R_TEMP
TEMPSENS
Electrical volume for Monitor PD
may set initial valuein response to
the temperature at power-on
to accelerate power-up sequence
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AK2581HB-AT-LF 功能描述:風扇 254x89mm 110/120VAC Hi Spd Ball Term RoHS:否 制造商:Sanyo Denki 產(chǎn)品:Fans 電流類型: 電源電壓:48 V 氣流:636 CFM 軸承類型: 噪聲:83 dBA 速度:6400 RPM 功率額定值:264 W 框架尺寸 (mm):172 mm x 150 mm x 102 mm 外殼材料:Aluminum 端接類型:Wire 系列:
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