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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 88 | jelle | 1 | Manufacturer: STMICROELECTRONICS |
| 2 | Order Code: 1202824 |
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| 3 | Manufacturer Part No: LD1117STR-E |
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| 257 | jelle | 4 | Description: V REG ADJ +1.25/15V, SMD, 1117 |
| 270 | jelle | 5 | Supplier: http://nl.farnell.com/stmicroelectronics/ld1117str-e/v-reg-adj-1-25-15v-smd-1117/dp/1202824 |
| 257 | jelle | 6 | Datasheet: http://www.st.com/stonline/products/literature/ds/2572/ld1117xx.pdf |
| 390 | jelle | 7 | Datasheet: http://www.st.com/stonline/books/pdf/docs/2572.pdf |
| 8 | Catalogue Page: 545 / EBU |
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| 9 | Price: € 1,32 |
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| 88 | jelle | 10 | |
| 390 | jelle | 11 | ------------------------------------------------------------------------ |
| 12 | |||
| 13 | Case Style: SOT-223 |
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| 14 | |||
| 15 | SOT-223 |
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| 16 | |||
| 17 | |||
| 18 | ------------------------------------------------------------------------ |
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| 19 | |||
| 291 | agaran | 20 | ;VOUT = VREF (1 + R2 / R1) |
| 21 | ; |
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| 22 | ;VREF = 1.25V |
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| 23 | ; |
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| 24 | ;# notes |
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| 25 | ; |
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| 26 | ;The power dissipated by the device will be equal to: |
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| 27 | ; IOUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX)) |
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| 28 | ;where, |
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| 29 | ; IOUT(MAX) = 250mA |
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| 30 | ; VIN(MAX) = 6V |
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| 31 | ; IGND at (IOUT = 250mA, VIN = 6V) = 5mA |
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| 32 | ;So, |
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| 33 | ; P = 250mA(6V – 3.3V) + 5mA(6V) = 0.71W |
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| 34 | ; |
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| 35 | ;page 7: Thermal resistance junction-case: 14 C/W |
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| 36 | ; |
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| 37 | ; |
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| 38 | ;=== 3.0 V ==== |
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| 39 | ; |
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| 40 | ;R1 = 220 |
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| 41 | ;R2 = 330 |
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| 42 | ; |
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| 43 | ;VOUT = VREF (1 + R2 / R1) |
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| 44 | ;3.000 = 1.25 * (1 + 280 / 200) |
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| 45 | ;2.969 = 1.25 * (1 + 330 / 240) |
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| 46 | ;3.125 = 1.25 * (1 + 330 / 220) |
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| 47 | ; |
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| 48 | ;( (VOUT / VREF) -1 ) = (R2 / R1) |
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| 49 | ; |
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| 50 | ;I = U / R |
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| 51 | ;3 / 200 = 0.015 |
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| 52 | ; |
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| 53 | ;P = I * U |
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| 54 | ; |
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| 55 | ;0.015 * 3 = 0.045 W |
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| 56 | ;0603 Case Size = 0.063 W |
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| 57 | ; |
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| 58 | ; |
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| 59 | ;=== 3.3 V === |
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| 60 | ; |
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| 61 | ;R1 = 240 |
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| 62 | ;R2 = 390 |
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| 63 | ; |
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| 64 | ;VOUT = VREF (1 + R2 / R1) |
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| 65 | ;3.281 = 1.25 * (1 + 390 / 240) |
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| 66 | ; |
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| 67 | ;== +3.0V Limits == |
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| 68 | ; |
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| 69 | ;VOUT = VREF (1 + R2 / R1) |
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| 70 | ;R1 = 240 |
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| 71 | ;R2 = 330 |
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| 72 | ;R1 = 99% = 237.6 |
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| 73 | ;R1 = 101% = 242.4 |
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| 74 | ;R2 = 99% = 326.7 |
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| 75 | ;R2 = 101% = 333.3 |
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| 76 | ; |
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| 77 | ;MIN(2.940) = 1.238 * (1 + 326.7 / 237.6) |
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| 78 | ;TYP(2.969) = 1.250 * (1 + 330.0 / 240.0) |
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| 79 | ;MAX(3.004) = 1.262 * (1 + 333.3 / 242.4) |
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| 80 | ; |
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| 81 | ;== +3.125 V Limits == |
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| 82 | ; |
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| 83 | ;VOUT = VREF (1 + R2 / R1) |
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| 84 | ;R1 = 220 |
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| 85 | ;R2 = 330 |
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| 86 | ;R1 = 99% = 217.8 |
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| 87 | ;R1 = 101% = 222.2 |
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| 88 | ;R2 = 99% = 326.7 |
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| 89 | ;R2 = 101% = 333.3 |
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| 90 | ; |
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| 91 | ;MIN(3.095) = 1.238 * (1 + 326.7 / 217.8) |
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| 92 | ;TYP(3.125) = 1.250 * (1 + 330.0 / 220.0) |
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| 93 | ;MAX(3.115) = 1.262 * (1 + 333.3 / 222.2) |
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| 94 | ; |
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| 95 | ;3.125 = 1.25 * (1 + 330 / 220) |
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| 96 | ; |
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| 97 | ; |
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| 98 | ;== +3.3V Limits == |
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| 99 | ; |
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| 100 | ;VOUT = VREF (1 + R2 / R1) |
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| 101 | ;R1 = 240 |
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| 102 | ;R2 = 390 |
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| 103 | ;R1 = 99% = 237.6 |
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| 104 | ;R1 = 101% = 242.4 |
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| 105 | ;R2 = 99% = 386.1 |
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| 106 | ;R2 = 101% = 393.9 |
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| 107 | ;MIN(3.250) = 1.238 * (1 + 386.1 / 237.6) |
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| 108 | ;TYP(3.281) = 1.238 * (1 + 386.1 / 237.6) |
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| 109 | ;MAX(3.313) = 1.262 * (1 + 393.9 / 242.4) |