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參數(shù)資料
| 型號： | TDA4605D |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | CONTROL CIRCUIT FOR SWITCH MODE POWER SUPPLIES USING MOS TRANSISTORS |
| 中文描述： | 控制電路開關(guān)電源用MOS晶體管 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大小： | 63K |
| 代理商： | TDA4605D |
ELECTRICAL CHARACTERISTICS
(V
CC
= 10V,T
amb
= 25
o
C, unlessotherwisespecified) (continued)
Symbol
GENERALLY VALID DATA (V
6
= 10V)
VOLTAGE OF THE ZERO Transition DETECTOR
V
8P
Positive Clamping Voltage
V
8N
Negative Clamping Voltage
V
8S
Threshold Value
TUL
Suppression of Transformer Ringing
-I
8
Input Current
PUSH-PULL OUTPUT STAGE
SATURATION VOLTAGES
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
I
8
= 1mA
I
8
= -1mA
0.75
-0.2
50
3.8
V
V
40
3
0
mV
μ
s
μ
V
4.5
4
V
8
= 0
V
SatU
V
SatU
V
SatU
Pin 5 Sourcing
Pin 5 Sinking
Pin 5 Sinking
I
5
= -0.1A
I
5
= +0.1A
I
5
= +0.5A
1.5
1.0
1.4
2.0
1.2
1.8
V
V
V
OUTPUT SLOW RATE
+dV
5
/dt
-dV
5
/dt
REDUCTION OF CONTROL VOLTAGE
-I
1
Current to reduce the Control Voltage
PROTECTION CIRCUIT
Rising Edge
Falling Edge
70
100
V/
μ
s
V/
μ
s
V
7
= 1V
50
μ
A
V
6(Min.)
Undervoltage Protection for V
6
:
Voltage at Pin 5 = V
5(Min.)
if V
6
< V
6(Min.)
Overvoltage Protection for V
6
:
Voltage at Pin 5 = V
5(Min.)
if V
6
> V
6(Max.)
Undervoltage Protection for V
AC
:
Voltage at Pin 5 = V
5(Min.)
if V
3
< V
3A
Over Temperature : at the given chip temperature the
IC will switch V
5
to V
5(Min.)
Voltage at Pin 3 if one of the protection functions was
triggered ; (V
3
will be clamped until V
6
< V
6A
)
Current Drain during Burst Operation
7.0
7.25
7.5
V
V
6(Max.)
15
16
16.5
V
V
3A
V
2
= 0V
970
1005
1040
mV
Oj
150
o
C
V
3Sat
I
3
= 750
μ
A
0.4
0.8
V
I
6
V
3
= V
2
= 0V
8
mA
4
FUNCTIONAL DESCRIPTION
In free running fly-back converters, the TDA4605
assumescontrol of aMOS powertransistor and all
necessaryregulation and monitoring functions.
The serial circuit of power transistor and primary
winding of the flyback transformeris connectedto
theinputvoltage.Duringtheswitch-onperiodofthe
transistor, energy is stored in the transformerand
during the switch-off period it is fed to te load via
the secondary winding. By varing the switch-on
time of the power transistor, the IC controls each
portionof energytransferred to the secondaryside
such that the output voltage remains nearly inde-
pendent of load variations.
The requiredcontrol information is taken from the
input voltage during the switch-on period and from
a regulationwinding during the switch-off period.A
new cyclebegins as soon as the energy stored in
the transformer has been totally delivered to the
secondaryside.
In differentload ranges, the SMPS will behave as
follows :
-
No-Load Operation :
The power supply unit
oscillates in non continuous mode at a typical
frequency of 20 to 40kHz. Depending upon the
transformer winding and the regulated voltage
divider, the output voltage can be slightly above
the nominalvalue.
-
Normal Operation :
Starting from typ. 200kHz,
the switchingfrequencyfalls with increasing load
and decreasing AC voltage. The duty cycle de-
pends primarily on the AC voltage. The output
voltage is onlyslightlyload-dependent.
-
OverloadPoint:
Maximumoutputpowerisavail-
able at thispoint of the outputcharacteristics
-
Overload:
The energytransferredper operation
cycle is limited at the top. Therefore, the output
voltage will fall with secondaryoveloading.
TDA4605
4/6
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