tda4700 ETC-unknow, tda4700 Datasheet - Page 5

• Manufacturer Part Number: tda4700
• Description: Switched-mode Power Supplies Smps
• Manufacturer: ETC-unknow

Pin Definitions and Functions (TDA 4718)
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Circuit Description
Voltage Controlled Oscillator (VCO)
The VCO generates a sawtooth voltage. The duration of the falling edge is determined
by the value of
approximately the frequency, is determined by the value of
C
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
filter
, the oscillator frequency can be changed by its rated value. During the fall time, the
Symbol
GND
R
C
I COMP
I SYNC
IUV
IOV
–
+
+
+
Q 2
Q 1
Q SYNC
C
R
C
C
R
T
R
soft start
filter
T
I
I
V
V
DYN
DYN
REF
S
C
T
. The duration of the rising edge of the waveform and, therefore,
Function
Ground 0 V
Ramp generator
Ramp generator
+ 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
Capacitance
VCO
R
C
T
T
5
R
C
R
R
R
T
. By varying the voltage at
TDA 4700
TDA 4718