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IC-NZ 参数 Datasheet PDF下载

IC-NZ图片预览
型号: IC-NZ
PDF下载: 下载PDF文件 查看货源
内容描述: 故障保护激光二极管驱动器 [FAIL-SAFE LASER DIODE DRIVER]
分类和应用: 驱动器二极管激光二极管
文件页数/大小: 20 页 / 509 K
品牌: ICHAUS [ IC-HAUS GMBH ]
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iC-NZ  
FAIL-SAFE LASER DIODE DRIVER  
Rev B2, Page 12/20  
Demo-Board  
were then again to be switched on, far too much cur-  
When using an N-type laser diode jumper J2 must be rent would flow; this could destroy the laser diode. The  
placed between pins 2 and 3 on the demo board. If same happens if the low and middle channels are reg-  
a P-type laser diode is used the jumper must be con- ulated and the high channel switched on for a lengthy  
nected between pins 1 and 2.  
period of time. In this instance CIL and CIM are slowly  
discharged and the voltage at CIH rises in order to  
maintain a constant optical power. The entire process  
is illustrated in Figure 7.  
Warning!  
Following calibration pin EN has to be briefly set to low  
before actual operation may start with EN set to high  
again. The following explains why.  
EN  
When the low channel (LENL hi) is switched on ca-  
pacitor CIL is charged. When the middle channel is  
switched in the internal control unit switches to CIM  
and starts to charge it. The voltage at CIL is then no  
longer regulated. As residual current could boost the  
voltage at CIL, which in turn would increase the cur-  
rent in the low channel, thus the capacitor at CIL is  
actively discharged with a maximum of 100 nA. The  
current in the low channel slowly decreases. As the  
control unit endeavours to keep the optical power con-  
stant, the capacitor at CIM is charged at the same rate  
as CIL is gradually discharged. If the middle chan-  
nel is now switched off, the control unit switches back  
to the low channel. Capacitor CIL is regulated again;  
CIM, however, remains charged. If the middle channel  
CIL  
CIM  
LENL  
LENM  
Overcurent  
I(Laser)  
Figure 7: Behavior with very long power-on times  
OPERATION WITH ONE OR TWO CHANNELS  
It is of course also possible to operate iC-NZ with one circuited with AGND. To use the safety functions of the  
or two levels of light intensity. To make use of the safety safety monitor diode the high channel must always be  
functions of the system in one- or two-channel mode, in use in one- or two-channel mode. Figures 8 to 11  
pins LDKx (x: L, M) on the unused channels must be give the configuration of iC-NZ for one- or two-channel  
kept unconnected. Nodes CIx should be directly short- operation for both N- and P-type laser diodes.