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參數(shù)資料
| 型號： | tle 5209 |
| 廠商： | SIEMENS AG |
| 英文描述： | H-Bridge for DC-Motor Applications(H橋直流電機驅動器) |
| 中文描述： | H型直流電橋電機應用（高橋直流電機驅動器） |
| 文件頁數(shù)： | 6/19頁 |
| 文件大?。?/td> | 208K |
| 代理商： | TLE 5209 |
TLE 5209 GP
Circuit Description
Data Sheet
6
1999-12-01
2.4
Monitoring Functions
Undervoltage lockout (UVLO):
When
V
S
reaches the switch on voltage
V
UV ON
the IC becomes active with a hysteresis.
All output transistors are switched off if the supply voltage
V
S
drops below the switch off
voltage
V
UV OFF.
2.5
Protective and Diagnostic Functions
The device is fully protected against all kinds of shorts at the outputs and
overtemperature and also detects open load.
a)
Output Shorted to Ground Detection
If a high side transistor is switched on and the output current rises above the
shutdown threshold
I
CS
for longer than the delay time
t
dCS
, all output transistors are
switched OFF and the Status outputs are set.
b)
Output Shorted to +
V
S
If a low side transistor is switched on and the output current rises above the
shutdown threshold
I
CS
for longer than the delay time
t
dCS
, all output transistors are
switched OFF and the Status outputs are set.
c)
Overload Detection
If a low side transistor and a hide side transistor is switched on and the current
through the load rises above the shutdown threshold
I
CS
for longer than the delay
time
t
dCS
, all output transistors are switched OFF and the Status outputs are set.
The diagnostic behaviour at short circuit is shown schematically in
Figure 4
.
d)
Overtemperature protection
At a junction temperature higher than
T
OFF
the thermal shutdown turns OFF all four
output stages commonly and the Status outputs are set.
e)
Open Load Detection
If the current through the low side transistor is lower than the reference current
I
dOL
in the ON-state, a timer is started. After a filter time
t
dOL
an open load failure will be
recognized and the Status outputs are set. If the current exceeds the reference
current
I
dOL
the open load timer is reset. If the H-bridge is switched to OFF-state
(PWM = L) during the open load filter time, the timer is stopped. The timer continues
if the H-bridge is switched in ON-state again. There is no reset of the open load
timer if the direction is changed using the DIR input in open load condition. This is
shown schematically in
Figure 3
.
2.6
Diagnosis Truth Table
Various errors as listed in the table “Diagnosis” are detected. Short circuits and overload
result in turning off the output stages after a delay. ST1 is active as long as the error
exists, but at least 10
μ
s. ST2 provides a latched output, this means if a fault occurs it is
active until at least one of the inputs DIR or PWM are toggled.
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