PI2002-EVAL1 datasheet(5/11 Pages) VICOR

5 / 11 page

Before initial power-up follow these steps to configure the

evaluation board for specific end application requirements:

2.0 Undervoltage (UV) and Overvoltage (OV) resistors set up:

2.1 UV and OV programmable resistors are configured

for a 3.3 V Vin (BUS voltage) application in a

two-resistor voltage divider configuration as shown in

Figure 4. UV is set to 2.6 V and OV is set for 3.8 V,

R1OV and R1UV are 2.00 K

Ω 1%. If PI2002-EVAL1 is

required to be used in a different Vin voltage

application please follow the following steps to

change the resistor values.

2.1.1 It is important to consider the maximum current

that will flow in the resistor divider and

maximum error due to UV and OV input .

current.

R1UV =

V(UVTH)

IRUV

2.1.2 Set R1UV and R1OV value based on system

allowable minimum current and 1% error;

IRUV ≥ 100 µA

R2UV =R1UV

( V(UV) –1)

V(UVTH)

Where:

V(UVTH) : UV threshold voltage

V(UV) : UV voltage set (0.5 V typ)

IRUV: R1UV current

R2OV =R1OV

( V(OV) –1)

V(OVTH)

Where:

V(OVTH) : OV threshold voltage

V(OV) : OV voltage set (0.5 V typ)

IROV: R1OV current

PI2002

V_Logic

GND

R1UV

R1OV

Vin

Figure 4 – UV & OV two-resistor divider configuration

Ref. Desg.

R1UV

R14

R2UV

R12

R1OV

R15

R2OV

R13

Picor Corporation • www.picorpower.com

PI2002-EVAL1 User Guide Rev 1.0 Page 5 of 11

2.1.3 Example for 2.0 V Vin (BUS voltage), to set UV and OV for ±10% Vin set UV at 1.8 V and OV at 2.2 V.

R2UV= R1UV

( V(UV) –1) = 2.00 KΩ*( 1.8 V –1) = 5.20 KΩ (or 5.23 KΩ % standard value)

V(UVTH)

0.5 V

R2OV= R1OV

( V(OV) –1) = 2.00 KΩ*( 2.2 V –1) = 6.80 KΩ (or 6.81 KΩ % standard value)

V(OVTH)

0.5 V

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