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ELM186 Datasheet(PDF) 4 Page - ELM Technology Corporation |
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ELM186 Datasheet(HTML) 4 Page - ELM Technology Corporation |
4 / 7 page 4 http://www.elm-tech.com Rev.1.0 7 - 5 2 1 LD MD 4 3 R1 power adjust D1 D2 0.1~10�F C1 Fig.1 5 2 1 AMD GND IREF VCC ALD 0.1~10�F LD MD 4 3 R1 power adjust D1 D2 C1 R4 voltage shift for MD Fig.2 ■Appliation circuits LDMs are used in many LD applications. A LDM contain a laser diode and a monitor diode in one package. These two diodes are optically connected inside the package. The monitor diode is a PN diode generates photo current to measure photo power from the LD. ELM186CxA can drive 4 kinds of laser diode modules(LDMs) having different polarity pins. Each ELM186CxA can drive only corresponding polarity of laser diodes(LD) and monitor diodes(MD). Table1 shows ELM186CxA and laser diode modules (LDM) combinations. ELM186CxA 120mA laser diode driver LD anode driving applications ELM186C1A and C2A are used when LD anode is driven. ALD is NPN emitter follower output. LD anode driving application only requires a resister for output power definition. Only a noise absorbing capacitor at VCC is recommended. Operation voltage is 5V or higher because it is necessary to have the sum of IC operation voltage and to LD forward voltage. LD anode drive has advantages on heat dissipation and fewer RC parts. The cases of LD mod- ules can be directly grounded in Fig.1 for good heat dissipation. ELM186C2A needs to have a compensation capacitor and a resistor at KMD pin for stable operation in Fig.3 and Fig4. LD anode driving application circuits Fig.1, Fig.2, Fig.3, Fig.4. No. Laser diode module pins Parts number of ELM186CxA 1 : LD anode, common, MD anode ELM186C1A(Fig.2) or ELM186C3A(Fig.6) 2 : LD anode, common, MD cathode ELM186C2A(Fig.4) or ELM186C4A(Fig.8) 3 : LD cathode, common, MD anode ELM186C1A(Fig.1) or ELM186C3A(Fig.5) 4 : LD cathode, common, MD cathode ELM186C2A(Fig.3) or ELM186C4A(Fig.7) 5 : Other LDM without a common pin All ELM186CxA Table 1 : LD MD LD MD LD MD LD MD LD MD |
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