U643B [ATMEL]
Flasher, 30-mohm Shunt; 闪光器， 30毫欧分流
| 型号： | U643B |
| 厂家： | 
ATMEL |
| 描述： | Flasher, 30-mohm Shunt |
| 文件： | 总5页 (文件大小：60K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
U643B
Flasher, 30-mW Shunt
Description
The bipolar integrated circuit U643B is used in relay- Lamp outage is indicated by frequency doubling during
controlled automotive flashers where a high-level EMC hazard warning as well as direction mode.
is required.
FD eTaetmupreerasture and supply voltage compensated
D Minimum lamp load for flasher operation: ≥ 1 W
flashing frequency
D Very low susceptibility to EMI
D Frequency doubling indicates lamp outage
D Protection according to ISO/TR 7637/1 level 4
D Relay driver output with high current
carrying capacity and low saturation voltage
Block Diagram
+ VS
+ 49
6
2
R3
Shunt
C1
Measuring comparator K 1
V6–81 mV
30 mW
4
20 kW
5 kW
K1
7
K2
3
8
Pulse
generator
R1
49 a–Comparator K2
Relay
R2
20 kW
49 a–Comparator K3
49 a
K3
1.5...2.2 kW
5
23 V
5 kW
20 kW
IC Ground
1
R4
95 9756
5 W 21 W 21 W
21 W 21 W 5 W
470 W
Indicator lamps
GND
– 31
Figure 1. Application circuit as a car flasher, Resistor R1 and R2: 1/4 Watt
R4 for protection against continuous reversed polarity: 0.5 Watt
Ordering Information
Extended Type Number
Package
DIP8
Remarks
U643B
U643B-FP
SO8
Rev. A3, 10-Apr-01
1 (5)
U643B
Pin Description
Pin
1
Symbol
GND
Function
1
2
3
4
GND
VS
8
7
6
5
SI
IC ground
2
V
S
Supply voltage V
S
LD
Vs
3
REL
OSC
OSC
Relay driver
U643B
4
C Oscillator
1
REL
5
R Oscillator
1
6
V
S
Supply voltage V
S
OSC
OSC
7
LD
SI
Lamp failure detection
Start input (49a)
94 9290
8
Figure 2. Pinning
Functional Description
Pin 1, GND
mized layer resistance from point V / shunt to Pin 6 is
S
The integrated circuit is protected against damage via recommended.
resistor R to ground (–31) in the case of battery reversal.
An integrated protection circuit together with external
4
Pin 7, Lamp outage detection
The lamp current is monitored via an external shunt
resistances R and R limits the current pulses in the IC.
2
4
resistor R and an internal comparator K1 with its
3
reference voltage of typ. 81 mV (V = 12 V). The outage
of one lamp out of two lamps is detected according to the
following calculation:
S
Pin 2, Supply voltage, V - Power
The arrangement of the supply connections to Pin 2 must
be so as to ensure that, on the connection printed circuit
S
Nominal current of 1 lamp: 21 W / (V = 12 V):
S
board (PCB), the resistance of V to Pin 6 is lower than
S
I
= 1.75 A
lamp
that to Pin 2.
Nominal current of 2 lamps: 2 x 21 W / (V = 12 V):
S
I
= 3.5 A.
lamp
Pin 3, Relay control output (driver)
The detection threshold is recommended to be set in the
middle of the current range: I
Thus the shunt resistor is calculated as:
R = V (K1) / I
The relay control output is a high-side driver with a low
saturation voltage and capable to drive a typical automo-
tive relay with a minimum coil resistance of 60 W.
[ 2.7 A
outage
3
T
outage
R = 81 mV/2.7 A = 30 mW.
3
Pin 4 and 5 Oscillator
Comparator K1‘s reference voltage is matched to the
characteristics of filament lamps (see “control signal
threshold” in the data part).
Flashing frequency, f , is determined by the R C compo-
1
1 1
nents as follows (see figure 1):
The combination of shunt resistor and resistance of wire
harness prevents Pin 7 from a too high voltage in the case
of shorted lamps.
1
f1 [
Hz
R1 C1 1.5
where
C ꢀ 47 mF
1
Pin 8, Start input
R + 6.8 kW to 510 kW
1
Start condition for flashing: the voltage at Pin 8 has to be
below K3 threshold (flasher switch closed).
In the case of a lamp outage (see Pin 7) the oscillator Humidity and dirt may decrease the resistance between
frequency is switched to the lamp outage frequency f
49 a and GND. If this leakage resistance is u 5 kW the IC
is still kept in its off-condition. In this case the voltage at
Pin 8 is between the thresholds of comparators K2 and
K3.
2
with f [ 2.2 f .
2
1
Duty cycle in normal flashing mode: 50%
Duty cycle in lamp outage mode: 40% (bright phase)
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
Pin 6, Supply voltage, Sense
For accurate monitoring via the shunt resistor, a mini- wattage of 1 W is required.
2 (5)
Rev. A3, 10-Apr-01
U643B
Absolute Maximum Ratings
Reference point Pin 1
Parameters
Symbol
Value
16.5
Unit
V
Supply voltage
Pin 2 and 6
V
S
Surge forward current
t = 0.1 ms Pin 2 and 6
I
I
I
1.5
1.0
50
A
A
mA
P
FSM
FSM
FSM
t = 300 ms Pin 2 and 6
P
t = 300 ms Pin 8
P
Output current
Power dissipation
Pin 3
I
0.3
A
O
T
= 95°C
DIP 8
SO 8
DIP 8
SO 8
P
tot
P
tot
P
tot
P
tot
420
340
690
560
mW
mW
mW
mW
amb
T
amb
= 60°C
Junction temperature
T
150
°C
°C
°C
J
Ambient temperature range
Storage temperature range
T
amb
–40 ... + 95
–55 ... + 150
T
stg
Thermal Resistance
Parameters
Symbol
Value
Unit
Junction ambient
DIP8
SO8
R
R
110
160
K/W
K/W
thJA
thJA
Electrical Characteristics
Typical values under normal operation in application circuit (see figure 1), V (+49, Pin 2 and 6) = 12 V.
S
Reference point ground (–31), T
= 25°C, unless otherwise specified
amb
Parameters
Supply voltage range
Supply current:
Test Conditions / Pins
Symbol
V (+49)
Min.
Typ.
Max.
Unit
V
Pin 2 and 6
Pin 2 and 6
9 to 15
S
Dark phase
Bright phase
I
I
4.5
7.0
8
11
mA
mA
S
S
Relay output:
saturation voltage
Pin 3
I = 150 mA, V = 9 V
O
S
with resistance = 60 W
V
1.0
0.1
V
mA
O
reverse current
Start delay
I
O
First bright phase
t
10
+5
ms
%
on
Frequency tolerance
Bright period
df
–5
1
Basic frequency f
Control frequency f
∆f
∆f
47
37
53
45
%
%
1
1
2
2
Frequency increase
Lamp outage
f
2.15 f
2.3 f
1
Hz
2
1
Control signal threshold
V = 15 V
Pin 7
Pin 7
V
R3
V
R3
V
R3
85
66
76
91
71
81
97
76
87
mV
mV
mV
S
V = 9 V
S
V = 12 V Pin 7
S
Leakage resistance
Lamp load
49a to GND
R
4
5
kW
P
L
P
1
W
Rev. A3, 10-Apr-01
3 (5)
U643B
Package Information
Package DIP8
Dimensions in mm
9.8
9.5
7.77
7.47
1.64
1.44
4.8 max
3.3
6.4 max
0.5 min
0.36 max
0.58
0.48
9.8
8.2
2.54
7.62
8
5
technical drawings
according to DIN
specifications
13021
1
4
Package SO8
Dimensions in mm
5.2
4.8
5.00
3.7
4.85
1.4
0.2
0.25
0.10
0.4
3.8
1.27
6.15
5.85
3.81
8
5
technical drawings
according to DIN
specifications
13034
1
4
4 (5)
Rev. A3, 10-Apr-01
U643B
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It is the policy of Atmel Germany GmbH to
1. Meet all present and future national and international statutory requirements.
2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems
with respect to their impact on the health and safety of our employees and the public, as well as their impact on
the environment.
It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as
ozone depleting substances (ODSs).
The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid
their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these
substances.
Atmel Germany GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed
in the following documents.
1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively
2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental
Protection Agency (EPA) in the USA
3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively.
Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances
and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice.
Parameters can vary in different applications. All operating parameters must be validated for each customer
application by the customer. Should the buyer use Atmel Wireless & Microcontrollers products for any unintended
or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers against all claims,
costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death
associated with such unintended or unauthorized use.
Data sheets can also be retrieved from the Internet:
http://www.atmel–wm.com
Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany
Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
Rev. A3, 10-Apr-01
5 (5)
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