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PDF TDA4716C Data sheet ( Hoja de datos )

Número de pieza TDA4716C
Descripción IC for Switched-Mode Power Supplies (SMPS)
Fabricantes Siemens Semiconductor 
Logotipo Siemens Semiconductor Logotipo



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No Preview Available ! TDA4716C Hoja de datos, Descripción, Manual

IC for Switched-Mode Power Supplies (SMPS)
Bipolar IC
TDA 4714 C
TDA 4716 C
Features
q Push-pull outputs (open collector)
q Double pulse suppression
q Dynamic current limitation
q Overvoltage protection
q IC undervoltage protection
q Reference voltage source
q Reference overload protection
q Soft start
q Feed-forward control
q Operational amplifier (TDA 4716 C)
P-DIP-14-1
P-DIP-16-1
Type
s TDA 4714 C
s TDA 4716 C
s Not for new design
Ordering Code
Q67000-A8312
Q67000-A8313
Package
P-DIP-14-1
P-DIP-16-1
These versatile SMPS ICs comprise digital and analog functions which are required to
design high-quality flyback, single-ended, and push-pull converters in normal, half-
bridge and full-bridge configurations. The components can also be used in single-ended
voltage multipliers and speed-controlled motors. Malfunctions in electrical operation are
recognized by the integrated op amps which activate protective functions.
Semiconductor Group
1
09.94

1 page




TDA4716C pdf
TDA 4714 C
TDA 4716 C
Pulse Turn-OFF Flipflop
The pulse turn-OFF flipflop enables the outputs at the start of each half cycle. If an error
signal from comparator K7 or a turn-off signal from K2 is present, the outputs will
immediately be switched off.
Comparator K3
Comparator K3 limits the voltage of capacitance Csoft start (and also at K2!) to a maximum
of + 5 V. The voltage at the ramp generator output may, however, rise to 5.5 V. With a
corresponding slope of the rising ramp generator edge, the duty cycle can be limited to
a desired maximum value.
Comparator K4
The comparator has its switching threshold at 1.5 V and sets the error flipflop with its
output if the voltage at capacitance Csoft start is below 1.5 V. However, the error flipflop
accepts the set signal only if no reset pulse (error) is applied. In this way the outputs
cannot be turned on again as long as an error signal is present.
Soft Start
The lower one of the two voltages at the plus inputs of K2 is a measure for the duty cycle
at the output. At the instant of turning on the component, the voltage at capacitor Csoft start
equals 0 V. As long as no error is present, this capacitor is charged with a current of 6 µA
at the maximum value of 5 V. In case of an error, Csoft start is discharged with a current of
2 µA. A set signal is pending at the error flipflop below a charge of 1.5 V and the outputs
are enabled if no reset signal is pending simultaneously. As the minimum ramp
generator voltage, however, is 1.8 V, the duty cycle at the outputs is actually increased
slowly and continuously not before the voltage at Csoft start exceeds 1.8 V.
Error Flipflop
Error signals, which are led to input R of the error flipflop cause an immediate disabling
of the outputs, and after the error has been eliminated, the component to switch on again
by the soft start.
Comparator K5, K8, VREF Overcurrent Load
These are error detectors which cause immediate disabling of the outputs via the error
flipflop when an error occurs. After elimination of the error, the component switches on
again by the soft start.
Semiconductor Group
5

5 Page





TDA4716C arduino
TDA 4714 C
TDA 4716 C
Characteristics (cont’d)
11 V < VS < 30 V; – 25 °C < TA < 85 °C
Parameter
Symbol
Limit Values
min.
typ. max.
Ramp Generator
Frequency range
Maximum voltage at CR
Minimum voltage at CR
Input current through RR
Current transformation ratio
Comparator K2
fRG
VH
VL
IRR
IRR/ICR
40
0
100
5.5
1.8
400
1/4
Input current
Turn-OFF delay time1)
Input voltage
Duty cycle D = 0
D = max
Common-mode input voltage range
Soft Start K3, K4
IK2
tD OFF
VI K2
VIC
0
2
500
1.8
5
5.5
Charge current for Csoft start
Discharge current for Csoft start
Upper limiting voltage
Switching voltage K4
Ich
Idch
Vlim
VK4
Operational Amplifier (TDA 4716 C)
6
2
5
1.5
Open-loop voltage gain
Input offset voltage
Temperature coefficient of VIO
Input current
Common-mode input voltage range
Output current
Rise time of output voltage
Transition frequency
Phase of fT
Output voltage
– 3 mA < I < 1.5 mA
GV0
VIO
TC
II
VIC
IQ
V/t
fT
ϕT
VQ H/L
60
– 10
– 30
0
–3
1.5
80
10
30
2
5
1.5
1
3
120
5.5
1) At the input: step function V = – 100 mV V = + 100 mV
Semiconductor Group
11
Unit
kHz
V
V
µA
µA
ns
V
V
V
µA
µA
V
V
dB
mV
µV/K
µA
V
mA
V/µs
MHz
degr.
V

11 Page







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