NCV887701BSTGEVB_TEST_PROCEDURE - 66 KB

Test Procedure for the NCV887701BSTGEVB Evaluation Board
Operational Guidelines
The demo board is rated to operate full load (3.6 A) for an input voltage as low as 2.6 V at the input terminal
under full power.
The DISB pin is rated 6 V maximum and is TTL compatible.
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A ‘0’ state disables the power supply.
A ‘1’ state enables the power supply.
Notes:
1- Limit time spent with the power supply operating at minimum input voltage (PCB VIN =
2.6 V) to avoid overheating the power semiconductors.
Test Procedure:
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Connect a DC source voltage (15 A capable) set to a voltage of 12-13 V as shown in Fig. 1.
Connect the DISB TTL control signal as shown in Fig. 1. The initial DISB state should be set to logic-‘0’.
Connect a 3.6 A constant current load on the output.
Decrease the DC input voltage until the PCB VIN voltage is 5.5V + 0.5V.
Set the DISB control signal to a TTL high state (i.e. 5 V).
Verify that the unit is regulating at VOUT = 6.8 V.
Reduce the DC input voltage until the PCB VIN = 2.6 V. Verify that the unit is regulating at VOUT =6.8 V.
DISB Command
(TTL)
DISB
VOUT
GND
VIN
3.6 A
Constant
Current
Load
NCV887701
6.8 V / 3.6 A
Demo Board
DC Source
(15 A capable)
GND
GND
Figure 1. Demo Board Connections
3/7/2014
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