TPS26600 Parallel Operation for Power Switches

Learn about TPS26600 Parallel Operation by Venkata Nandam for efficient power switching in Feb. 2017. Explore eFuse schematics and tests for VIN, SHDN, current sharing, over load response, and short-circuit scenarios.

• TPS26600
• Power Switches
• Parallel Operation
• eFuse
• Venkata Nandam

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1. TPS26600 Parallel Operation Venkata Nandam Power Switches Feb 2017

2. 3A - TPS26600 eFuse Schematic TI Information Selective Disclosure 2

3. Turn on with VIN Test Conditions : Vin=24V, 3A Resistive Load, Cout = 47uF Output voltage soft starts in 5ms with 47nF dVdT cap CH1 FLT\ is only shown here eFuse total Input current TI Information Selective Disclosure 3

4. Turn on with SHDN\ Test Conditions : Vin=24V, 3A Resistive Load, Cout = 47uF Output voltage soft starts in 5ms with 47nF dVdT cap SHDN\ of CH1 used to start 3A eFuse (Another channel SHDN\ pin can also be used) eFuse total Input current TI Information Selective Disclosure 4

5. Current Sharing During Steady State Test Conditions : Vin=24V, 0-3A Constant Current Load, Cout = 47uF Load Current Sharing in Efuses 1.5 Individual Efuse Current (A) 1.25 Only 3 to 10mA mismatch during steady state 1 0.75 CH1 CH2 0.5 0.25 0 0 0.5 1 1.5 2 2.5 3 Load Current (A) TI Information Selective Disclosure 5

6. Over Load Response Test Conditions : Vin=24V, 6 Resistive Load, Cout = 47uF Output voltage drops due to load current regulation Thermal shutdown auto-retry duration eFuse total Input current regulates to 3.2A during over load TI Information Selective Disclosure 6

7. Output Continuous Short-circuit Response Test Conditions : Vin=24V, 0 Resistive Load, Cout = 47uF Output drops to zero due to output continues short-circuit Thermal shutdown auto-retry duration eFuse total Input current regulates to 3.2A during short circuit TI Information Selective Disclosure 7

8. Response at the instance of Short-circuit Test Conditions : Vin=24V, 0 Resistive Load, Cout = 47uF Output immediately drops to zero due to short-circuit FLT\ of both channels asserts low to indicate fault Total eFuse Input current regulates to 3.2A during short circuit TI Information Selective Disclosure 8

9. Recovery from Short-circuit Response Test Conditions : Vin=24V, 0 Resistive Load, Cout = 47uF Output soft starts after short-circuit release eFuse supports full load 3A during recovery Thermal shutdown auto-retry duration TI Information Selective Disclosure 9

10. Load Step Response Test Conditions : Vin=24V, 0A to 3A Resistive Load, Cout = 47uF No output voltage drop eFuse supports full load step from 0A to 3A TI Information Selective Disclosure 10

11. Resources Achieve 20-A Circuit Protection and Space Efficiency Using Paralleled eFuses http://www.ti.com/lit/an/slva836/slva836.pdf Calculators, Spice models http://www.ti.com/product/TPS2660/toolssoftware Download EVM user s guide http://www.ti.com/tool/tps26600-02evm TI Information Selective Disclosure 11