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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LM1949 bảng dữ liệu(PDF) 10 Page - Texas Instruments |
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LM1949 bảng dữ liệu(HTML) 10 Page - Texas Instruments |
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10 / 17 page  LM1949 SNLS349C – FEB 1995 – REVISED MARCH 2013 www.ti.com Q1 Power Dissipation: (1) SWITCHING INJECTOR DRIVER CIRCUIT The power dissipation of the system, and especially of Q1, can be reduced by employing a switching injector driver circuit. Since the injector load is mainly inductive, transistor Q1 can be rapidly switched on and off in a manner similar to switching regulators. The solenoid inductance will naturally integrate the voltage to produce the required injector current, while the power consumed by Q1 will be reduced. A note of caution: The large amplitude switching voltages that are present on the injector can and do generate a tremendous amount of radio frequency interference (RFI). Because of this, switching circuits are not recommended. The extra cost of shielding can easily exceed the savings of reduced power. In systems where switching circuits are mandatory, extensive field testing is required to guarantee that RFI cannot create problems with engine control or entertainment equipment within the vicinity. The LM1949 can be easily modified to function as a switcher. Accomplished with the circuit of Figure 23, the only additional components required are two external resistors, RA and RB. Additionally, the zener needs to be reconnected, as shown, to RS. The amount of ripple on the hold current is easily controlled by the resistor ratio of RA to RB. RB is kept small so that sense input bias current (typically 0.3 mA) has negligible effect on VH. Duty cycle and frequency of oscillation during the hold state are dependent on the injector characteristics, RA, RB, and the zener voltage as shown in the following equations. (2) 10 Submit Documentation Feedback Copyright © 1995–2013, Texas Instruments Incorporated Product Folder Links: LM1949 |
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