參數(shù)資料
型號(hào)： TDA4700A
廠商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.07 A SWITCHING CONTROLLER, 100 kHz SWITCHING FREQ-MAX, PDIP24
封裝： PLASTIC, DIP-24
文件頁(yè)數(shù)： 17/21頁(yè)
文件大?。?/td> 436K
代理商： TDA4700A
TDA 4700
TDA 4718
Semiconductor Group
5
Pin Definitions and Functions (TDA 4718)
Circuit Description
Voltage Controlled Oscillator (VCO)
The VCO generates a sawtooth voltage. The duration of the falling edge is determined
by the value of
C
T. The duration of the rising edge of the waveform and, therefore,
approximately the frequency, is determined by the value of
R
T. By varying the voltage at
C
filter, 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.
Pin
Symbol
Function
1
GND
Ground 0 V
2
3
R
R
C
R
Ramp generator
R
R
Ramp generator
C
R
4
5
I COMP
I SYNC
+ Input comparator K2
Sync. input
6
7
IUV
IOV
Input undervoltage, ON/OFF
Input overvoltage
8
9
–
I
DYN
+
I
DYN
Input dynamic current limitation (–)
Input dynamic current limitation (+)
10
11
+
V
REF
+
V
S
Reference voltage
Supply voltage
12
13
Q 2
Q 1
Output Q2
Output Q1
14
15
Q SYNC
C
soft start
Sync. output
Soft start
16
17
18
R
T
C
filter
C
T
VCO
R
T
Capacitance
VCO
C
T
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