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SI-3120J 数据表(PDF) 5 Page - Sanken electric |
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SI-3120J 数据表(HTML) 5 Page - Sanken electric |
5 / 6 page 50 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-3000J 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=3000J series S: Stability coefficient of I4IN (may be set to any value) Note: In the SI-3000J 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-3000J series. GND GND OPEN 5 2 3 4 1 SI-3000J IREX REX 47 µF47µF VO V04 VIN ++ GND GND OPEN 5 2 3 4 1 SI-3000J IREX1 REX1 REX2 47 µF47µF VO I4IN V04 VIN ++ 25 20 15 10 5 02468 10 External Resistor REX (k Ω) VIN=VO+1V SI-3150J SI-3120J SI-3090J SI-3050J External Resistor REX1 (k Ω) 25 20 15 10 5 0 1.0 2.0 VIN=VO+1V SI-3150J REX2 =3.75k Ω SI-3120J R EX2 =3k Ω SI-3050J R EX2 =1.25k Ω SI-3090J R EX2 =2.25k Ω qSI-3000J Series External Variable Output Voltage Circuit |
类似零件编号 - SI-3120J |
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类似说明 - SI-3120J |
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