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參數(shù)資料
| 型號： | TEA2019 |
| 廠商： | 意法半導體 |
| 英文描述： | CURRENT MODE SWITCHING POWER SUPPLY CONTROL CIRCUIT |
| 中文描述： | 電流模式開關電源控制電路 |
| 文件頁數(shù)： | 5/7頁 |
| 文件大?。?/td> | 80K |
| 代理商： | TEA2019 |
Efficientand fast switch-off
When the positive base drive is removed, 1s
(typically) will elapse before the application of
negative current therefore allowing a safe and
rapid collector current fall.
Safety Functions
Overload & short-circuit protection
When the voltageapplied to pin 12 exceeds the
current limitation thershold voltage [V
th(Ic)
], the
outputflip-flopisreset andthetransistoristurned
off.
The shunt resistor R
e
must be calculated so as
to obtain the current limitation threshold on pin
12 at the maximumallowable collectorcurrent.
Figure2
Demagnetizationsensing
This functiondisablesany new conduction cycle
of the transistor as long as the core is not com-
pletelydemagnetized.
When not used, pin 5 mustbe grounded.
t
on(max)
Outside the regulation area and in the absence
of current limitation, the maximum conduction
time is set at about70% of the period.
t
on(min)
A minimum conducting time is ensured during
each period (see Figure 2).
Supplyvoltagemonitoring
TheTEA2019willstop operatingifV
CC
+ onPin 3
fallsbelow the thresholdlevel V
CC(stop)
.
R
B
R
e
I
B
I
C
t
t
I
C
I
B
0
0
COLLECTOR
CURRENT
BIAS
CURRENT
I
C
I
B
R
e
R
B
I
C
t
on(min)
1
12
TEA2019
2
Starting Process
(Figure 3)
Prior to starting, a low current is drawn from the
high voltagesource through a high value resistor.
This current charges the power supply storage
capacitorof the device.
No output pulses are available before the voltage
on pin3 hasreached the thresholdlevel [V
CC(start)
,
V
+CC
rising].
During this time the TEA2019 draws only 1mA
(typically). When the voltageon pin 3 reachesthis
threshold base drive pulsesappear.
The energy drawn by these pulses tends to dis-
charge the power supply storage capacitor. How-
ever a hysteresis of about 1.1V (typically)(
V
CC
)
is implemented to avoidthe device from stopping.
V
CC (start)
CC (stop)
V
V
CC
V
CC
6V
4.9V
t
2
Figure 3 :
Normal TEA2019 Start up Sequence
TEA2019
5/7
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