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U644B

Features: ` Frequency doubling indicates lamp outage` Frequency independent of temperature and voltage change` Relay driver output with high current-carrying capacity and low saturation voltage` Minimum lamp load for flasher operation: 1 W` Very low susceptibility to EMI` Protection according to I...

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U644B: Features: ` Frequency doubling indicates lamp outage` Frequency independent of temperature and voltage change` Relay driver output with high current-carrying capacity and low saturation voltage` Min...

U644B Data Sheet

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Part Number:
U644B
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` Frequency doubling indicates lamp outage
` Frequency independent of temperature and voltage change
` Relay driver output with high current-carrying capacity and low saturation voltage
` Minimum lamp load for flasher operation: 1 W
` Very low susceptibility to EMI
` Protection according to ISO TR7637/1 level 4
` Control input (Kl 15)


Pinout

Connection Diagram


Specifications

Reference point Pin 1
Parameters
Symbol
Value
Unit
Supply voltage                                  Pin 2
VS
18
V
Surge forward current   tP = 0.1 ms  Pin 2
                                      tP = 300 ms Pin 2
                                      tP = 300 ms Pin 8
IFSM
IFSM
IFSM
1.5
1.0
50
A
A
mA
Output current Pin 3
IO
0.3
A
Power dissipation Tamb = 120°C   DIP8
                             Tamb = 105°C    SO8
                             Tamb = 60°C     DIP8
                             Tamb = 60°C      SO8
Ptot
Ptot
Ptot
Ptot
230
300
690
560
mW
mW
mW
mW



Description

The bipolar integrated circuit, U644B, is used in relaycontrolled automotive flashers where a high level EMC is required. Lamp outage is indicated by frequency doubling during hazard warning as well as direction mode.

If the flasher module provides an 4-pin connector the control pin of U644B (Pin 6) can be used to operate the IC in an extremly low-current mode.




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