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Other than AC wall chargers, Ventev also has USB Type-C car chargers that support USB Power Delivery technology including the Ventev Dashport pd1300 Car Charger and Ventev TSD03 Car Charger.
The Ventev TSD03 Car Charger supports up to 18 watts with 5 volts @ 3 amps, 9 volts @ 2 amps, and 12 volts @ 1.5 amps power profiles using USB Power Delivery 2.0. While the car charger only comes with a single USB Type-C port, it has enough power to support most phones in the market today.
Using the USB Power Test App from Granite River Labs with the Granite River Labs USB Power Delivery Compliance C2 Tester, we ran the following tests on the Ventev TSD03 Car Charger to see how it supports power.
The USB Power Test App first negotiates a power contract for every fixed PDO supported by the Ventev TSD03 Car Charger, and increases the load gradually to find the threshold where over current protection (OCP) kicks in and voltage and current start to drop for safety reasons.
The USB Power Test App also reports out the fixed PDO's supported by the Ventev charger and their OCP thresholds. The OCP thresholds above the maximum current levels for the 9V and 12V PDO's are very high which should just be around 10-20% for best practices.
| PDO | OCP (A) | %OCP |
|---|---|---|
| PDO#1 Fixed: 5V 3A | 3.67 | 122.2% |
| PDO#2 Fixed: 9V 2A | 2.8 | 140.2% |
| PDO#3 Fixed: 12V 1.5A | 2.21 | 147.6% |
The USB Power Test App takes this data to produce an I-V curve which graphically shows the relationship between voltage and current for each fixed PDO. We can observe for the 9V and 12V PDO's, as the current increases beyond the OCP threshold, the voltage immediately shuts off. The 5V PDO displays a slight current fold-back behavior when crossing OCP even though the charger doesn't support PPS.
We also observed many compliance failures when using the USB Power Delivery Compliance C2 Tester from Granite River Labs to run just a subset of the full USB Power Delivery compliance test suite on the Ventev TSD03 Car Charger.
USB-IF High Level Mapping Summary
Sl No
|
Test Category
|
Test Group Description
|
Test Result
|
|---|---|---|---|
1
|
PHY_PRIMARY_TX
|
BMC Physical Layer Transmitter
|
FAIL
|
2
|
PHY_PRIMARY_RX
|
BMC Physical Layer Receiver
|
FAIL
|
3
|
PHY_PRIMARY_MISC
|
BMC Physical Layer Miscellaneous
|
PASS
|
4
|
PROT_PRIMARY
|
Protocol Specific Primary
|
FAIL
|
5
|
POWER_PRIMARY
|
Power Source/Sink Primary
|
PASS
|
Result Summary
Sl No
|
Test ID
|
Test Name
|
Test Result
|
|---|---|---|---|
1
|
TDA.2.1.1.1
|
TDA.2.1.1.1 BMC PHY TX EYE
|
FAIL
|
2
|
TDA.2.1.1.2
|
TDA.2.1.1.2 BMC PHY TX BIT
|
FAIL
|
3
|
TDA.2.1.2.2
|
TDA.2.1.2.2 BMC PHY RX INT REJ
|
FAIL
|
4
|
TDA.2.1.2.1
|
TDA.2.1.2.1 BMC PHY RX BUSIDL
|
PASS
|
5
|
TDA.2.1.3.1
|
TDA.2.1.3.1 BMC PHY TERM
|
PASS
|
7
|
TDA.2.2.1
|
TDA.2.2.1 BMC PROT SEQ GETCAPS
|
PASS
|
8
|
TDA.2.2.2.1
|
TDA.2.2.2.1 BMC PROT SEQ CHKCAP P PC
|
FAIL
|
9
|
TDA.2.2.2.2
|
TDA.2.2.2.2 BMC PROT SEQ CHKCAP NOMARK P PC
|
PASS
|
13
|
TDA.2.2.7
|
TDA.2.2.7 BMC PROT BIST NOT 5V SRC
|
PASS
|
15
|
TDA.2.2.9
|
TDA.2.2.9 BMC PROT GSC REC
|
PASS
|
16
|
TDA.2.3.1.1
|
TDA.2.3.1.1 POW SRC LOAD P PC
|
PASS
|
17
|
TDA.2.3.2.1
|
TDA.2.3.2.1 POW SRC TRANS P PC
|
PASS
|
BMC Eye Diagram
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