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UTC31002A 参数 Datasheet PDF下载

UTC31002A图片预览
型号: UTC31002A
PDF下载: 下载PDF文件 查看货源
内容描述: 电话音调振铃 [TELEPHONE TONE RINGER]
分类和应用: 电话
文件页数/大小: 4 页 / 37 K
品牌: UTC [ Unisonic Technologies ]
 浏览型号UTC31002A的Datasheet PDF文件第1页浏览型号UTC31002A的Datasheet PDF文件第2页浏览型号UTC31002A的Datasheet PDF文件第4页  
UTC 31002A  
LINEAR INTEGRATED CIRCUIT  
APPLICATION NOTE  
and shows an increase in the current drawn up to the  
initiation voltage Vsi. The I-V characteristic after  
initiation remains unchanged. Curve C illustrates the  
The application circuit illustrates the use of the UTC  
31002A device in typical telephone tone ringer  
application.  
The AC ringer signal voltage appears  
across the TIP and RING inputs of the circuit and  
is attenua-  
effect of increasing  
RSL above 6.8K  
initiation current decreases but again current  
alter triggering is unchanged.  
ted by capacitor C1 and resistor R1.  
C1 also provides isolation from DC voltage (48V)  
on the exchanged line.  
After full wave rectification by the bridge  
diode, the wave form is filtered by capacitor C4 to  
provide a DC supply for the tone ringer chip.  
As this voltage exceeds the initiation voltage (Vsi),  
oscillation starts.  
With the components shown , the output frequency  
chops between 512Hz (FH1) and 640 Hz(FH2)  
at a 10 Hz(FL) rate.  
The loudspeaker load is coupled through a 1300W  
to 8W transformer.  
The output coupling capacitor C5 is required with  
transformer coupled loads.  
When driving a pizeo-ceramic transducer type load,  
the coupling C5 and transformer (1300W:8W) are  
not required.  
However, a current limiting resistor is required.  
The low frequency oscillator oscillates at a rate (FL)  
controlled by an external resistor (R2) and capacitor  
(C2).  
The fequency can be determined using the relation  
FL=1/1.289 R2* C2. The high frequency oscillates  
at a FH1,FH2 controlled by an external resistor (R3)  
and capacitor (C3). The frequency can be determined  
using the relation FH1=1/1.504 R3*C3 and FH2=  
1/1.203 R3*C3.  
Pin 2 of the UTC 31002A allows connection of  
external resistor RSL, which is used to program the  
slope of the supply current vs. supply voltage  
characteristics (see Fig.3), and hence the supply  
current up to the initiation voltage (Vsi). This initiation  
voltage remains constant independent of RSL.  
The supply current drawn prior to triggering varies  
inversely with RSL, decreasing for increasing value  
of resistance. Thus, increasing the value of RSL, will  
decrease the amount of AC ringing current required to  
trigger the device. As such, longer sucribser loops are  
possible since less voltage is dropped per unit length of  
loop wire due to the lower current level. RSL can  
also be used to compensated for smaller AC coupling  
capacitors (C5 on Fig.4) (higher impedance) to the  
line which can be used to alter the ringer  
equivalence  
number of a tone ringer circuit.  
The graph in Fig.3 illustrates the variation of supply  
current with supply voltage of the UTC 31002A.  
Three curves are drawn to show the variation of  
initiation current with RSL. Curve B ( RSL=6.8K)  
shows the I-V characteristic for UTC 31002A  
tone ringer. Curve A is a plot with RSL<6.8KW  
3
UTC UNISONIC TECHNOLOGIES CO., LTD.  
QW-R108-005,A