AK2557 반도체 회로 부품 판매점
4ch Cathode Common LDD
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 AKM |
[AK2557]
= Preliminary =
AK2557
4ch Cathode Common LDD with Digital APC
1. General Description
The AK2557 is a 4-channel cathode common LDD (Laser Diode Driver) suitable for MFPs (Multi Function
Printer) and LBPs (Laser Beam Printer). The AK2557 equips a 200MHz [Max.] LDD that switches the LD
current, current-DACs that set the operation current of LD and a feed-back digital APC (Auto Power
Control) circuit that maintains the optical LD power constant. The AK2557 can improve the printing quality
and reduces external parts and the cost with useful functions such as the internal APC adjustment,
BIAS_APC (Auto “Ibias” Setting), LD Power Attenuation and Shading Correction with digital interface
achieving with the internal arithmetic circuits. Multiple AK2557s can be connected to the multi-beams LD
(≥ 8 beams).
2. Features
□ 4ch Cathode Common LDD Switching LD Current at 200MHz [Max]
□ 9-bit Current-DAC for “Ibias”: Maximum Output Current = 45mA [Typ.]
□ 9-bit Current-DAC for “Isw” with AGC (Auto Gain Control): Maximum Output Current = 90mA [Typ.]
□ Feed-Back Digital APC (APC_FB) and Internal APC Adjustment Circuit with Digital Interface
□ Monitor PD Current Input for 4 Beams LD and Multi-Beams LD (by Cascade Connection)
□ “BIAS_APC” (Auto “Ibias” Setting)
□ LD Power Attenuation and Shading Correction
□ Excessive Over-Current Alarm
□ Start-Up Operation (Loading External EEPROM Data and Executing Initial APC)
□ Power Supply: 5V±5% Single Power
□ Package: 48-pin QFN with Exposed Pad
AK2557-E-Preliminay0.90 (Brief)
-1-
2015/7
3. Block Diagram
[AK2557]
DATAP1
DATAN1
DATA
(LVDS)
CH1
AK2557
R_BIAS1_I
R_SW1_I
SDCLK
PDMON
Common
Digital Circuit
PD
Ipd
PD
PD
Detector
vpd
Comp.
APC
I_APCH1_I Attenuation
R_APC1_DAC
R_APCx_DAC
DAC_APC
vapcref
BIAS_APC I_APCHx_I
Shading
Rref VREF
VREFBIAS
Over Current
Alarm
Oscillator
Power On
Reset
IDAC
_SW1
Isw1
IDAC
_BIAS1
Ibias1
ILD1
Parallel I/F
Mode
Control
P_ENB*
P_SEL*
P_SH*
P_CH1*
P_CH0*
P_HL*
Iop1
LD1
Serial I/F
Set-Up
CSI*
CSO
SKOI
DOI
DIO
EEPROM
(MicroWire)
CS
SK
DI
DO
DATAPx
DATANx
CHx (x=2, 3, 4)
DATA
(LVDS)
With Power Down Protection
BG_FIX*
R_SWx_I
IDAC
_SWx
Iswx
R_BIASx_I
CUALM
SET* STRT A2 A1 A0
IDAC
_BIASx
Ibiasx
ILDx
INT_ST
* : With Pulled-Down Resistor
Ildx
LDx
Figure 3.1. AK2557 Block Diagram
AK2557-E-Preliminay0.90 (Brief)
-2-
2015/7
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( akm )
AK2557 data
데이터시트 다운로드 :
[ AK2557.PDF ]
[ AK2557 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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