External direct drive

Dallington Electric Power Company

coil current charging angle (resident)

Control

Program oil current peak limit [ 123]

Programmable stop recovery time

When 94%of the rated current does not reach

Speed output

permanent conduction protection

External Darlington Overvoltage protection

Internal power supply Qina

Inverse protection of batteries

Instructions

L497

is an integrated electronic ignition control control The device is used to ignite the system sensor that uses the Hall effect. The device drives the NPN external Dalinton control coil current to provide the required storage low energy consumption. A special function of L497 is that programming recovery to correctly resident TD/T time is not nominal value at the peak of the coil. If this is the case, there may be only one spark that is accelerating quickly or coldly.

Electrical characteristics (vs 14.4 V, --40 ° C lt; tj lt; 125 ° C, unless otherwise regulated)

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Staying angle control

Keep the angle control circuit calculate the output transistor's divert time D rotation speed, the characteristics of the power supply voltage and coil. About the negative increase capacitor of the Hall effect input signal began to discharge current 11D with a constant constant. When the current reaches the setting peak, the capacitor uses the constant current I11C 13.3 x i11D and the coil current charging to maintain constant saturation through the drive level and the outside Dallingon. The capacitor CT began to enter the signal at the Hall effect in the edge of the edge of the edge of POSI. By comparing ENV10 and V11. In order to avoid the strange effect, a positive stagnation is added to the resident comparator, and the negative edge of the CT in the negative edge of the Hall effect is quickly discharged. In this way, the average voltage on the CW increases the speed of the motor, and otherwise it maintains a constant speed. TDT remains unchanged (rather than DT cost) for control and sufficient time to avoid low energy sparks. Under the static conditions of static saturation time conditions, if CT CW, it is recommended to use the value of the application circuit in Figure 4.

Low saturation and high saturation

Frequency operation

Due to the voltage range of the pin 11, if used in Figure 4 Components, less than 10 Hz (4 -cylinder engine is 300 RPM), the closing time reaches the maximum value (about 50 milliseconds), and then the circuit gradually controls the staying angle because T – 50 milliseconds. More than 200 Hertz (for the 4 -cylinder engine is 6000 rpm)) The conduction time is less than 3.5 milliseconds. If the coilis 6mh and 6A are used, the closing time is shortened to zero, and the circuit is lost to maintain angle control.

Inspector response

The ignition system must provide constant energy even lower than 80Hz/s even under the condition that the motor accelerates and slows down. These conditions can use the signal gene generator to simulate the linear modulation frequency between 1hertz and 200 Hz (this corresponds to 30 and 6000 RPM (for 4 -cylinder engines).

current limit

Oil The current through the measuring current flows through the sensor of the sensor RS ON outer LS ON. When ISENSE ICOIL+I14, when the voltage on the RS drops to the internal comparator or Reshold, the feedback circuit activation and the Iseense remain constant. (Figure 1) Forced the external Dallington in the active area. Under this condition: Isense ICOIL If you need PreciseSpeakcoilCurrents, you must fine -tuned or auxiliary resistance division (R10, R11) supplement:

Slowly restore control (Figure 2)

If the Iseense does not reach 94%of the nominal value, it will be disappeared quickly Pick up the signal low . The next positive conversion load current of the input signal is immediately activated, generating the maximum value of TDESAT; then the voltage on the CSRC is almost increased until the standby arrives. During this period, the voltage conversion of the China Securities Regulatory Commission of the China Securities Regulatory Commission was converted from the transition from the voltage conversion of the China Securities Regulatory Commission to from the converting from the voltage of the China Securities Regulatory Commission to from the converter from the converter from the converter of the China Securities Regulatory Commission to from the converted from from the time. A current minusing the charging current of the well -type capacitor generates TDESAT mode. This means that TDESAT is reduced slowly until the value is reached, and after a period of SRC, then the value of the normal value of 7%. Time TSRC is given by the following formulas by the following formulas. Out: TRSC 12.9 R7 China Securities Regulatory Commission (MS), of which R7 is a bias resistor (INK ) and 8 capacitors (units: μF) in 8 places (unit: μF).

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Permanent conduction protection (Figure 3)

The permanent conductive protection circuit monitoring input cycle. When the sensor signal is high and discharged, the consumption current is charged as when the sensor signal is low. If the input ratio is low. The voltage on the CP reaches the internal fixing value for a period of time, so that the coil current is low to zero. Slowly decline is to avoid unnecessary sparks. When the input signal becomes lower, the CP quickly releases the current control loop. The following formulas are concluded: TP (seconds) 18 CP R7, where R7 is a delay capacitor (unit: μF) on the bias resistor (unit: K) and CP pin on the pin 12.

Other other Application Note

Delivery protection

Uninstalled insuranceThe protection must be necessary by the external Zina if this function is necessary.In Figure 4, the DZ2 protects the driver level, and the connection protection needle foot 6 between the pin 6 and 7.Protect the power supply input (needle foot 3) and Hall effect sensor.The resistance R4 is the uninstallation of the DZ1 current.

Overvoltage restrictions

Sensing the external Dallingon set electrode voltage through a separator R2, R3.The voltage limit increases R2 or R3.Due to the use of active circuits, under high -capacity conditions, in order to maintain stability, the reverse osmosis CO series network must be used.The RO-Co value depends on the application.In addition, it is recommended to use the resistor R13 to limit it under high voltage conditions, even if the power supply voltage is broken, the voltage will be generated.

Inverse protection of the battery

Due to the external impedance of the existence of pins 6, 3, 16, 15 L497 has anti -inverted electric protection voltage.

Negative peak protection

If the negative electrode is also required in a short period of time, the diode and capacitor must be used.