Texas Instruments HSS-MOTHERBOARDEVM, Руководство пользователя

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Current Limit
11 SLVUBD4A – January 2018 – Revised December 2018
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Copyright © 2018, Texas Instruments Incorporated
High Side Switch Motherboard Evaluation Module
5 Current Limit
When I
OUT
reaches the current limit threshold, I
CL
= K
CL
/ R
ILIM
, the device can switch off immediately, or the
device can remain enabled and limit I
OUT
. The HSS-MOTHERBOARDEVM enables multiple variants use
case as any device can be populated in the snap-off daughtercards or on the footprint directly on the
board. In the case that the device remains enabled (and limits I
OUT
), the thermal shutdown or energy limit
protection feature may be triggered due to the high amount of power dissipation in the device. Check the
datasheet for the device being used to see what the range of current limit can be.
6 Current Sense
High-accuracy current sensing allows real-time monitoring and more diagnostics without further
calibration. A current mirror is used to source a 1/5000 of the load current on SNS pin. The 1-k
Ω R1
resistor is connected to the SNS pin to convert the current source into a voltage:
V
SNS
= 1000 × I
OUT
/ 5000
For multiple channel devices see the datasheet for the SELx configuration to know which channel is being
monitored.
7 Transient Protection
The HSS-MOTHERBOARDEVM comes with large footprints for TVS diodes if they are needed for any
transient testing. D3 is an SMB footprint while D4, D5, and D6 are SMC footprints. In addition, there are
also some capacitor footprints that can be populated if need be such as C4 or C11.
8 Soldering Down U2
The HSS-MOTHERBOARDEVM allows the user to solder down a device directly to the board without
going through the daughtercard. As noted in the
Section 1 , care must be taken when soldering down the
device.
9 Bill of Materials
Designator Quant
ity Value Description PackageReference PartNumber Manufacturer
C1 1 0.1uF CAP, CERM, 0.1 uF, 16 V, +/-
10%, X5R, 0402 0402 160R07X104KV
4T Johanson
Technology
C1_S, C2_S,
C3_S, C4_S,
C5_S, C7 6 0.1uF CAP, CERM, 0.1 uF, 50 V, +/-
10%, X7R, AEC-Q200 Grade 1,
0805 0805 GCM21BR71H1
04KA37K MuRata
C2 1 1uF CAP, CERM, 1 uF, 16 V, +/-
10%, X5R, 0805 0805 0805YD105KAT
2A AVX
C5, C6 2 0.022uF CAP, CERM, 0.022 uF, 25 V,
+/- 10%, X7R, 0603 0603 C0603C223K3R
ACTU Kemet
C8 1 100pF CAP, CERM, 100 pF, 10 V, +/-
10%, X7R, 0603 0603 0603ZC101KAT
2A AVX
C9, C10 2 22uF CAP, CERM, 22 uF, 50 V, +/-
20%, X5R, 6x5x5mm 6x5x5mm CKG57NX5R1H
226M500JH TDK
D1, D2 2 200V Diode, Switching, 200 V, 0.2 A,
SOT-23 SOT-23 BAS21-7-F Diodes Inc.
H1, H2, H3, H4 4 Machine Screw, Round, #4-40
x 1/4, Nylon, Philips panhead Screw NY PMS 440
0025 PH B&F Fastener
Supply
H5, H6, H7, H8 4 Standoff, Hex, 0.5"L #4-40
Nylon Standoff 1902C Keystone
J1, J2 2 Receptacle, 2.54mm, 12x1,
Gold, TH Receptacle, 2.54mm,
12x1, TH 801-47-012-10-
012000 Mill-Max