 SU.HARDW (2:5020/75.7)  SU.HARDW 
 From : Juris Schumahers                    2:4790/16.4     Sat 26 Jun 93 04:24 
 Subj : Help!: Power Supply                                                     

>᫨ - ⠭ ⠭p  ⠭   200-250 ,
> ,   p ⠪ - TL494 ?

TL494 - "Switchmode pulse width modulation control circuits"   奬 
         ࠢ  ⠡஬.

Pin connections:

        TL494 (Motorola), IR3M02 (Sharp), SU analog - KP1114E4

               Ŀ Ŀ
 Non-Inv.   1 +Ĵ\                    /Ĵ+ 16  Non-Inv.
 Input             \___________________/           input
                 1 /           Error  \2    
 Inv.Input  2 -Ĵ/             Ampl. 2  \Ĵ- 15  Inv.Input
                Error           Vcc<Ŀ       
 Compen/Feedbck Ampl. 1          Ŀ  
 PWM Compara-3    5v   Ref. Ĵ  14  V
 tor Input           Ĵ\                 ref
                0.12v    \____              
 Dead-Time  4  I    /             13  Output Mode
 control             Ĵ/                          Control
                Ŀ               
       C    5  Ĵ                              12  Vcc
        T         Oscillator   ^ ^          
                                 ĿC 
       R    6  Ĵ                  npn Ĵ  11  C
        T          Ĵ              2
                                  B   Q2   
   Ground   7           Ĵ  10  E
                     Ŀ   E        2
                  C      npn    B           
        C   8  Ĵ     Q1    Ĵ   9  E
         1            E                  1
               

Q1, Q2 - 室 ࠢ塞  ࠭,
R ,C   - (6,5 뢮) 譨 १  , ।騥
 T  T     ७ 

                               1.1
                    f   = --------------
                     osc    R   .  C
                              T      T

 ஡ , ⨯ 奬 祭  ६
ࠬ    ଥ MOTOROLA Semiconductors
"Linear/Switchmode Voltage Regulator Manual".

With regards                   Juris.

