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LM1949 データシート(PDF) 10 Page - Texas Instruments

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部品番号 LM1949
部品情報  Injector Drive Controller
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LM1949 データシート(HTML) 10 Page - Texas Instruments

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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
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