NCV887720BSTGEVB データシートの表示（PDF） - ON Semiconductor

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NCV887720BSTGEVB

NCV887720 Automotive Grade High-Frequency Start-Stop Boost Controller Evaluation Board User'sManual

ON Semiconductor 

NCV887720BSTGEVB

Operational Guidelines

The evaluation board is rated to operate under full load for

input voltage as low as 3.75 V at the input terminal under full

power (less if output current is reduced). Start-Stop

applications use reverse battery protection diodes in front of

the boost converter (Figure 2), so the input source can

operate down to 3.75 V plus a diode drop (i.e ∼4.25 V).

Notes:

1. The IC UVLO (undervoltage lockout) is 4.25 V

for VOUT rising, 3.8 V for VOUT falling (0.45 V

hysteresis).

2. Limit time spent with the power supply operating

at minimum input voltage (equivalent to

VIN = 3.75 V) to avoid overheating the power

semiconductors.

First Time Power-Up:

1. Connect a DC source voltage (15 A capable) set to

a voltage of 13 − 14 V as shown in Figure 1.

2. Connect the DISB TTL control signal as shown in

Figure 1. The initial DISB state should be set to

logic −‘0’.

3. Connect a 2.5 A constant current load on the

output.

4. Decrease the DC input voltage until the PCB VIN

voltage is 5.5 V ±0.5 V.

5. Set the DISB control signal to a TTL high state

(i.e. 5 V).

6. Verify that the unit is regulating at

VOUT = 10.0 V.

7. Reduce the DC input voltage until the PCB

VIN = 3.75 V. Verify that the unit is regulating at

VOUT = 10.0 V.

Start-Stop Voltage Transient Test:

1. Connect both DC1 and DC2 input power supplies

as illustrated in Figure 2. Adjust DC2 so that PCB

VIN = 3.75 V for a 2.5 A load.

2. Connect a 2.5 A load on the output. If a load

resistor is used, it is recommended to start from a

DC1 input voltage of 13 − 14 V to avoid

overstressing the PCB boost diode (D1, rated 4 A).

3. Monitor VOUT. Disconnect supply DC1. VOUT

should have a response similar to that of Figure 3.

DISB Command

(TTL)

Reverse Polarity

Protection Diode Harness

DISB

GND

VOUT

VIN NCV887720

10 V / 2.5 A

Evaluation Board

PS2

(30 W capable)

PS1

(15 A capable)

GND

GND

2.5 A

Constant

Current

Load

Figure 2. Evaluation Board Connections

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