MC33193 查看數據表（PDF） - Motorola => Freescale

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MC33193

Automotive Direction Indicator

Motorola => Freescale 

Freescale SMeCm3i3c1o93nductor, Inc.

MAIN DIFFERENCES BETWEEN

UAA1041B & MC33193

The MC33193 is pin compatible with the UAA1041.

Supply Current

Supply current is more stable on the MC33193 when the

device is in “on” or “off” state. In “on” state the supply current

is only 40% higher than when in the “off” state, as compared

to a ratio of 3 times for the UAA1041. This results in a lower

voltage drop across the ground resistor R3 (see On–Chip

Relay Driver).

Short Circuit Detection

The MC33193 has no short circuit detection.

Standby Mode (Pin 6)

The UAA1041 has no standby mode. Pin 6 is used as an

Enable/Disable for the short circuit detection.

The MC33193 uses Pin 6 to set the device in standby

mode. If Pin 6 is connected to ground, the MC33193 is in the

standby mode. In this mode, standby current is very low and

Pin 8’s starter resistor R2 and a 2.0 kΩ internal resistor are

switched off. As soon as Pin 6 is at a high level (typical

threshold = 2Vbe) the device becomes active. In the

application, the MC33193 can be connected directly to the

battery and awakened whenever Pin 6 is connected to the

vehicle’s battery by way of a protection resistor and the

ignition key switch.

Lamp Defect Detection (Pin 7)

The UAA1041 operates with a 30 mΩ shunt resistor to

sense the lamp current. It’s lamp defect detection threshold

of Pin 7 is typically 85 mV.

The MC33193 is designed to operate with 20 mΩ shunt

resistor and at a reduced threshold of 50 mV. This reduces

power generation in the flasher module. In addition, the

MC33193 incorporates an RF filter to enhance RFI immunity.

Load Dump and Overvoltage Behavior

The UAA1041 and MC33193 both behave the same in this

regard. Both have double battery detection and lamp turn–off

protection in the event of a jump start. During load dump,

both devices are protected by an internal 30 V zener diode

with the relay activated during a load dump.

Relay Driver

Drive capability of both devices is the same. Free wheeling

diode protection is internal to both devices. The free wheeling

voltage is 2Vbe for the UAA1041 and 3Vbe for the MC33193.

This results in a higher clamp voltage across the relay and

thus in a faster turn–off. In addition, the lower “on” state

supply current is lower on the MC33193 and thus the voltage

drop across the ground resistor R3 is reduced. This results in

an even higher clamp voltage across the relay.

Oscillator Phase

The oscillator phase is opposite on the MC33193 as

compared to the UAA1041. The Oscillator voltage is falling

during “on” state and rising during “off” state for the

MC33193.

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