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NCV78M00

NCV890103 Evaluation Board User'sManual

ON Semiconductor 

NCV890103GEVB

OPERATIONAL GUIDELINES

1. Connect a dc input voltage, within the 6.0 V to

36 V range, between VIN and GND.

2. Connect a dc enable voltage, within the 2.0 V to

36 V range, between EN and GND. This will

power up the switcher. The VOUT signal should

be 3.3 V.

3. Add a load to VOUT – up to 1.0 A.

Figure 5. NCV890103 Board Connections

ADDITIONAL GUIDELINES

Output Voltage Selection

The voltage output for the switcher is adjustable and can

be set with a resistor divider. The FB reference for the

switcher is 0.8 V.

VOUT

RUPPER

Desired

Output (V)

1.2

1.5

1.8

2.5

3.3

5.0

VREF (V)

0.8

0.8

0.8

0.8

0.8

0.8

RUPPER

(kW, 1%)

5.11

8.87

12.7

21.5

31.6

52.3

RLOWER

(kW, 1%)

10.0

10.0

10.0

10.0

10.0

10.0

FB = 0.8 V

RLOWER

Use the following equation:

RUPPER + RLOWER

VOUT*VFB

VFB

Some common setups are listed below:

Reset with Adjustable Delay

The RSTB pin is pulled low as long as the voltage on the

FB pin is lower than 92% (typical) of the reference voltage

(which corresponds to the output voltage being lower than

92% of its regulation level). It is high impedance when the

voltage goes above 94% (typical) of the regulation level,

after a delay adjusted by the capacitor on the DELAY pin.

The capacitor is held at ground until the output enters

regulation: CDELAY is then quickly charged to the internal

rail voltage (VRESU), then discharged by the Idelay current

until its voltage reaches the lower threshold VDELTH. Only

at this moment the RSTB pin voltage goes high, indicating

the end of the Reset condition.

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