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SI-3157F Datenblatt(PDF) 5 Page - Sanken electric |
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SI-3157F Datenblatt(HTML) 5 Page - Sanken electric |
5 / 6 page 37 1. Variable output voltage with a single external resistor The output voltage may be increased by inserting resistor REX between terminals No.4 (sensing terminal) and No.3 (output terminal). The cur- rent IREX flowing into terminal No.4 is 1mA (typ.), therefore the adjusted output voltage VOUT is: VO=V04+IREX•REX *V04: output voltage of SI-3000F series However, the built-in resistor (between terminals No. 4 and No.1) is a semiconductor resistor, which has approximately thermal characteris- tics of +0.2%/ °C. It is important to keep the thermal characteristics in mind when adjust- ing the output voltage. 2. Variable output voltage with two external resistors The output voltage may be increased by inserting resistors REX1 be- tween terminals No.4 (sensing terminal) and No.3 (output terminal) and REX2 between terminals No.4 and No.1 (ground terminal). The current I4IN flowing into terminal No.4 is 1mA (typ.) so the thermal characteristics may be improved compared to the method shown in 1 by setting the external current IREX1 at approximately 5 times the value of I4IN (stability coefficient S=5). The adjusted output voltage VOUT in this case is: VO=V04+REX1•IREX1 IREX1=S•I4IN The value of the external resistors may be obtained as follows: REX1= VO-V04 REX2= V04 S•I4IN , (S-1)•I4IN *V04: Output voltage of SI-3000F series S: Stability coefficient of I4IN (may be set to any value) Note: In the SI-3000F series, the output voltage increase can be ad- justed as mentioned above. However, when the rise is set to ap- proximately 10V compared to output voltage V04, the necessary output current may not be obtained due to the S.O.A. protection circuit in the SI-3000F series. GND GND OPEN 5 2 3 4 1 SI-3000F IREX REX 47 µF47µF VO V04 VIN ++ GND GND OPEN 5 2 3 4 1 SI-3000F IREX1 REX1 REX2 47 µF47µF VO I4IN V04 VIN ++ qSI-3000F Series External Variable Output Voltage Circuit (Excluding SI-3025F) 35 20 25 30 15 10 5 0 2468 10 External Resistor REX (k Ω) SI-3240F SI-3150F SI-3120F SI-3090F SI-3050F VIN=VO+1V External Resistor REX1 (k Ω) 35 20 25 30 15 10 5 0 1.0 2.0 VIN=VO+1V SI-3150F REX2 =3.75k Ω SI-3050F REX2 =1.25k Ω SI-3120F REX2 =3k Ω SI-3090F REX2 =2.25k Ω SI-3240F REX2 =6k Ω |
Ähnliche Teilenummer - SI-3157F |
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Ähnliche Beschreibung - SI-3157F |
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