SNVAA21 August   2021 LM61480-Q1 , LM61495-Q1 , LM62460 , LM62460-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Different Types of Current Sensing
  4. 3Basic Current Sharing Operation
  5. 4Schematic and BOM
  6. 5Lab Measurements
  7. 6Caveats and Recommendations
  8. 7Summary
  9. 8References

4 Schematic and BOM

GUID-20210615-CA0I-TDFB-HMJJ-GN5BXZRLHTKG-low.gif Figure 4-1 System Level Block Diagram

Test Condition:

  • VIN = 16 V
  • VOUT = 3.3 V
  • IOUT = 9A Continuous | 12 A Peak (4.5 A continuous per phase)
Figure 4-2 Dual Phase Application Full Schematic

Notes:

  1. The EN pins of both channels are connected to each other.
  2. The positive supply rail, +Vs, of the op-amp was connected to the Vout for these tests. However it is recommended to connect to an external auxiliary supply rail that is operational before these converters are started up.
  3. This is a preliminary design and the component values and circuit schematic might need adjustments.
  4. Two separate EVMs were used and wired together, along with a breakout board for the op-amp circuit, for this design.
Table 4-1 LM62460RPHEVM 6-A 2.1-MHz EVM Bill of Materials
DESIGNATOR DESCRIPTION MANUFACTURER PART NUMBER QUANTITY
C1 CAP, AL, 100 uF, 63 V, +/- 20%, 0.35 ohm, AEC-Q200 Grade 2, SMD Panasonic EEE-FK1J101P 2
C2, C3 CAP, CERM, 10 uF, 50 V, +/- 10%, X5R, 1210 TDK C3225X5R1H106K250AB 4
C4, C5 CAP, CERM, 0.47 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 TDK CGA3E3X7R1H474K080AB 4
C6 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0402 TDK CGA2B3X7R1H104K050BB 2
C7, C11 CAP, CERM, 2.2 µF, 10 V,+/- 10%, X7R, AEC-Q200 Grade 1, 0603 MuRata GRM188R71A225KE15J 4
C8, C9 CAP, AL, 100 µF, 16 V, ±20%, AEC-Q200 Grade 3, SMD MuRata GCM32EC71A476KE02K 4
C10 CAP, AL, 100 µF, 16 V, +/- 20%, AEC-Q200 Grade 3, SMD Panasonic EEE-1CA101AP 2
C12 CAP, CERM, 10 pF, 50 V, +/- 5%, C0G/NP0, AEC-Q200 Grade 1, 0603 TDK CGA3E2C0G1H100D080AA 2
C13 CAP, CERM, 0.15 uF, 50 V, +/- 10%, X7R, AEC-Q200 Grade 1, 0603 TDK CGA3E3X7R1H154K080AB 2
C14 CAP, CERM, 1 uF, 16 V, +/- 20%, X7R, AEC-Q200 Grade 1, 0603 MuRata GCM188R71C105MA64D 2
Cx1 CAP, CERM, 0.1 uF, 50 V, +/- 10%, X7R, 0805 MuRata GRM21BR71H104KA01L 1
Cx2, Cx3, Cx4 CAP, CERM, 100 pF, 50 V, +/- 5%, C0G/NP0, 0805 Kemet C0805C101J5GACTU 3
L1 Inductor, Shielded, Composite, 800 nH, 13 A, 0.01 ohm, AEC-Q200 Grade 1, SMD Coilcraft XAL5030-801MEB 2
R1 RES, 49.9, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060349R9FKEA 2
R2 RES, 187 k, 1%, 0.1 W, 0603 Yageo RC0603FR-07187KL 2
R3 RES, 0, 5%, 0.063 W, AEC-Q200 Grade 0, 0402 Vishay-Dale CRCW04020000Z0ED 2
R4 RES, 49.9 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060349K9FKEA 2
R6, R11, R13 RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW0603100KFKEA 6
R7 RES, 0, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Stackpole Electronics Inc RMCF0603ZT0R00 2
R8 RES, 4.99 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW06034K99FKEA 2
R9 RES, 21.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060321K0FKEA 2
R12 RES, 6.81 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW06036K81FKEA 2
R14 RES, 43.2 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060343K2FKEA 2
R15 RES, 59.0 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW060359K0FKEA 2
Rx2, Rx7 RES, 100, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW1206100RFKEA 2
Rx3, Rx8 RES, 49.9 k, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW120649K9FKEA 2
Rx4 RES, 499 k, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW1206499KFKEA 1
Rx5 RES, 1.00 k, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW12061K00FKEA 1
Rx6 RES, 10.0 k, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW120610K0FKEA 1
Rx9 RES, 332 k, 1%, 0.25 W, AEC-Q200 Grade 0, 1206 Vishay-Dale CRCW1206332KFKEA 1
U1 LM62460QRPHTQ1, RPH0016A (VQFN-HR-16) Texas Instruments LM62460QRPHTQ1 2
Ux1 OPA991IDBVR operational amplifier Texas Instruments OPA991IDBVR 1
Cx5 CAP, CERM, 1000 pF, 50 V, +/- 5%, C0G/NP0, 1206 MuRata GRM3195C1H102JA01D 0
R5, R10 RES, 100 k, 1%, 0.1 W, AEC-Q200 Grade 0, 0603 Vishay-Dale CRCW0603100KFKEA 0