U643B-MFPY [ATMEL]
Flasher, 30-mohm Shunt; 闪光器， 30毫欧分流
| 型号： | U643B-MFPY |
| 厂家： | 
ATMEL |
| 描述： | Flasher, 30-mohm Shunt |
| 文件： | 总9页 (文件大小：251K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Features
•
•
•
•
•
•
Temperature and Supply Voltage Compensated Flashing Frequency
Frequency Doubling Indicates Lamp Outage
Relay Driver Output with High Current Carrying Capacity and Low Saturation Voltage
Minimum Lamp Load for Flasher Operation: ≥ 1W
Very Low Susceptibility to EMI
Protection According to ISO/TR 7637/1 Level 4
Flasher IC with
30-mΩ Shunt
U643B
1. Description
The bipolar integrated circuit U643B is used in relay-controlled automotive flashers
where a high-level EMC is required.
Lamp outage is indicated by frequency doubling during hazard warning as well as
direction mode.
Rev. 4727B–AUTO–09/05
2. Block Diagram
Figure 2-1. Car Flasher Application Circuit, Resistor R1 and R2: 0.25W; R4 for Protection Against Continuous Reversed
Polarity: 0.5W
+ V S
+ 49
6
2
R3
C1
Measuring comparator K 1
V6-81 mV
30 mΩ
Shunt
4
20 kΩ
5 kΩ
K1
7
K2
3
8
Pulse
generator
R1
49 a-Comparator K 2
Relay
R2
20 kΩ
49 a-Comparator K 3
49 a
K3
1.5...2.2 kΩ
5
23 V
5 kΩ
20 kΩ
IC Ground
1
R4
5 W 21 W 21 W
21 W 21 W 5 W
470 Ω
Indicator lamps
GND
- 31
2
U643B
4727B–AUTO–09/05
U643B
3. Pin Configuration
Figure 3-1. Pinning
GND
8
7
6
5
SI
1
2
3
4
VS
LD
U643B
VS
REL
OSC
OSC
Table 3-1.
Pin Description
Pin
1
Symbol
GND
VS
Function
IC ground
2
Supply voltage VS
Relay driver
3
REL
OSC
OSC
VS
4
C1 Oscillator
R1 Oscillator
Supply voltage VS
5
6
7
LD
Lamp failure detection
Start input (49a)
8
SI
3
4727B–AUTO–09/05
4. Functional Description
4.1
Pin 1, GND
The U643B is protected against damage in case of battery reversal via resistor R4 to ground
(–31). An integrated protection circuit together with external resistances R2 and R4 limits the cur-
rent pulses in the IC.
4.2
4.3
4.4
Pin 2, Supply Voltage, VS Power
The arrangement of the supply connections to pin 2 must be so as to ensure that on the connec-
tion printed circuit board (PCB), the resistance of VS to pin 6 is lower than that to pin 2.
Pin 3, Relay Control Output (Driver)
The relay control output is a high-side driver with a low saturation voltage. It is capable of driving
a typical automotive relay with a minimum coil resistance of 60Ω.
Pin 4 and 5, Oscillator
The flashing frequency, f1, is determined by the R1C1 components as given by the formula below
(see Figure 2-1 on page 2):
1
------------------------------------
f1 ≈
Hz
R1 × C1 × 1.5
where C1 ≤47 µF, R1 = 6.8 kΩ to 510 kΩ
In case of a lamp outage (see pin 7) the oscillator frequency is switched to the lamp outage fre-
quency f2 with f2 ≈ 2.2 × f1.
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)
4.5
Pin 6, Supply Voltage, Sense
For accurate monitoring via the shunt resistor, a minimized layer resistance from point VS/shunt
to pin 6 is recommended.
4
U643B
4727B–AUTO–09/05
U643B
4.6
Pin 7, Lamp Outage Detection
The lamp current is monitored via an external shunt resistor R3 and an internal comparator K1
with its reference voltage of typically 81 mV (VS = 12V). The outage of one lamp is detected
according to the following calculation:
Nominal current of 1 lamp: 21W / (VS = 12V): Ilamp = 1.75A
Nominal current of 2 lamps: 2 × 21W / (VS = 12V): Ilamp = 3.5A.
The detection threshold should be set in the middle of the current range:
Ioutage ≈ 2.7A
Thus, the shunt resistor is calculated as:
R3 = VT (K1) / Ioutage
R3 = 81 mV/2.7A = 30 mΩ
Comparator K1's reference voltage is matched to the characteristics of filament lamps (see Con-
trol Signal Threshold in “Electrical Characteristics” on page 6).
The combination of shunt resistor and resistance of wire harness prevents pin 7 from a too high
voltage in the case of shorted lamps.
4.7
Pin 8, Start Input
Start condition for flashing: the voltage at pin 8 has to be below K3 threshold (flasher switch
closed).
Humidity and dirt may decrease the resistance between 49a and GND. If this leakage resistance
is > 5 kΩ, the IC still remains in the OFF condition. In this case the voltage at pin 8 is between
the thresholds of comparators K2 and K3.
During the bright phase the voltage at pin 8 is above the K2 threshold, during the dark phase it is
below the K3 threshold. For proper start conditions a minimum lamp wattage of 1W is required.
5
4727B–AUTO–09/05
5. Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Reference point pin 1
Parameters
Symbol
Value
Unit
Supply voltage
Pins 2 and 6
VS
16.5
V
Surge Forward Current
tP = 0.1 ms
tP = 300 ms
tP = 300 ms
Pins 2 and 6
Pins 2 and 6
Pin 8
IFSM
IFSM
IFSM
1.5
1.0
50
A
A
mA
Output current
Pin 3
IO
0.3
A
Power Dissipation
T
amb = 95°C
DIP 8
SO8
DIP 8
SO8
Ptot
Ptot
Ptot
Ptot
420
340
690
560
mW
mW
mW
mW
Tamb = 60°C
Junction temperature
TJ
150
°C
°C
°C
Ambient temperature range
Storage temperature range
Tamb
Tstg
–40 to +95
–55 to +150
6. Thermal Resistance
Parameters
Symbol
Value
Unit
DIP8
RthJA
RthJA
110
160
K/W
K/W
Junction ambient
SO8
7. Electrical Characteristics
Typical values under normal operation in application circuit (see Figure 2-1 on page 2), VS (+49, pin 2 and 6) = 12V.
Reference point ground (–31), Tamb = 25°C, unless otherwise specified.
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Supply voltage range
Pins 2 and 6
VS (+49)
9 to 15
V
Pins 2 and 6
Dark phase
Bright phase
Supply current
IS
IS
4.5
7.0
8
11
mA
mA
Relay output:
Pin 3
Saturation voltage
IO = 150 mA, VS = 9V
with resistance = 60Ω
VO
IO
1.0
0.1
V
mA
Reverse current
Start delay
First bright phase
ton
10
+5
ms
%
Frequency tolerance
δf1
–5
Basic frequency f1
Control frequency f2
∆f1
∆f2
47
37
53
45
%
%
Bright period
Frequency increase
Lamp outage
f2
2.15 f1
2.3 f1
Hz
VS = 15V, pin 7
VS = 9V, pin 7
VS = 12V, pin 7
VR3
VR3
VR3
85
66
76
91
71
81
97
76
87
mV
mV
mV
Control signal threshold
Leakage resistance
Lamp load
49a to GND
RP
PL
4
5
kΩ
1
W
6
U643B
4727B–AUTO–09/05
U643B
8. Ordering Information
Extended Type Number
Package
DIP8
Remarks
U643B-MY
Pb-free
U643B-MFPY
SO8
Tubed, Pb-free
Taped and reeled, Pb-free
U643B-MFPG3Y
SO8
9. Package Information
9.1
DIP8
7
4727B–AUTO–09/05
9.2
SO8
Package SO8
Dimensions in mm
5.2
4.8
5.00
4.85
3.7
1.4
0.25
0.2
0.4
3.8
0.10
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
1
4
10. Revision History
Please note that the following page numbers referred to in this section refer to the specific revision
mentioned, not to this document.
Revision No.
History
• Put datasheet in a new template
• Updated text to new style guide
• First page: Pb-free logo added
• Page 6: Ordering Information changed
4727B-AUTO-09/05
8
U643B
4727B–AUTO–09/05
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4727B–AUTO–09/05
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