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Número de pieza | TDA4700A | |
Descripción | Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS | |
Fabricantes | Siemens Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TDA4700A (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
No Preview Available ! Control IC for Single-Ended and Push-Pull
Switched-Mode Power Supplies (SMPS)
TDA 4700
TDA 4718
Features
q Feed-forward control (line hum suppression)
q Symmetry inputs for push-pull converter
(TDA 4700)
q Push-pull outputs
q Dynamic output current limitation
q Overvoltage protection
q Undervoltage protection
q Soft start
q Double pulse suppression
P-DIP-24-1
Type Ordering Code Package Temp.-Range
TDA 4700 A Q67000-Y594 P-DIP-24-1 – 0 to 70 °C
s TDA 4718 A Q67000-Y639 P-DIP-18-1 – 0 to 70 °C
s Not for new design
These versatile SMPS control 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 component can also be used in single-ended
voltage multipliers and speed-controlled motors.
Malfunctions in electrical operation are recognized by
the integrated operational amplifiers, which activate
protective functions.
P-DIP-18-1
1) Is now available for temperature range – 25 to 85 °C.
Semiconductor Group
1
05.95
1 page TDA 4700
TDA 4718
Pin Definitions and Functions (TDA 4718)
Pin Symbol
1 GND
2 RR
3 CR
4 I COMP
5 I SYNC
6 IUV
7 IOV
8 – IDYN
9 + IDYN
10 + VREF
11 + VS
12 Q 2
13 Q 1
14 Q SYNC
C15 soft start
16 RT
17 Cfilter
18 CT
Function
Ground 0 V
Ramp generator RR
Ramp generator CR
+ Input comparator K2
Sync. input
Input undervoltage, ON/OFF
Input overvoltage
Input dynamic current limitation (–)
Input dynamic current limitation (+)
Reference voltage
Supply voltage
Output Q2
Output Q1
Sync. output
Soft start
VCO RT
Capacitance
VCO CT
Circuit Description
Voltage Controlled Oscillator (VCO)
The VCO generates a sawtooth voltage. The duration of the falling edge is determined
by the value of CT. The duration of the rising edge of the waveform and, therefore,
approximately the frequency, is determined by the value of RT. By varying the voltage at
Cfilter, the oscillator frequency can be changed by its rated value. During the fall time, the
VCO provides a trigger signal for the ramp generator, as well as an L signal for a number
of IC parts to be controlled.
Semiconductor Group
5
5 Page TDA 4700
TDA 4718
Absolute Maximum Ratings
Parameter
Symbol
Limit Values
min. max.
Supply voltage
Voltage at Q1, Q2
Current at Q1, Q2
Symmetry 1, 2 TDA 4700; A
Sync output
Sync input
Input Cfilter
Input RT
Input CT
Input RR
Input CR
Input comparator
K2, K5, K6, K7
Output K5
Input op amp TDA 4700; A
Output op amp TDA 4700; A
VS
VQ
IQ
VSYM
VSYNC Q
ISYNC Q
VSYNC I
VI Cf
VI RT
VI CT
VI RR
II CR
VI K
VQ K5
VI Op Amp
VQ Op Amp
– 0.3
– 0.3
– 0.3
– 0.3
0
– 0.3
– 0.3
– 0.3
– 0.3
– 0.3
– 10
– 0.3
– 0.3
– 0.3
– 0.3
33
33
70
33
7
10
33
7
7
7
7
10
33
33
33
VS – 1
max. 7
Reference voltage
Input Csoft start
Junction temperature
Storage temperature
Thermal resistance
system - air TDA 4700; A
TDA 4718
TDA 4718 A
VREF
VI soft start
Tj
Tstg
Rth SA
Rth SA
Rth SA
– 0.3
– 0.3
– 55
VREF
7
150
125
65
70
60
Unit Test
Condition
V
V Q1, Q2 high
mA Q1, Q2 low
V
V SYNC Q high
mA SYNC Q low
V
V
V
V
V
mA
V
V
V
V
V
V
V
°C
°C
K/W
K/W
K/W
Semiconductor Group
11
11 Page |
Páginas | Total 21 Páginas | |
PDF Descargar | [ Datasheet TDA4700A.PDF ] |
Número de pieza | Descripción | Fabricantes |
TDA4700 | Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS | Siemens Semiconductor |
TDA4700A | Control IC for Single-Ended and Push-Pull Switched-Mode Power Supplies SMPS | Siemens Semiconductor |
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