NCP500SQL27T1 datasheet(15/20 Pages) ONSEMI

15 / 20 page

NCP500

http://onsemi.com

Figure 27. Typical Application Circuit

Vout

Battery or

Unregulated

Voltage

OFF

Figure 28. Typical Application Circuit

Vout

Battery or

Unregulated

Voltage

OFF

Output

Input

1.0

Output

Input

1.0

The NCP500 series can be current boosted with a PNP transis-

tor. Resistor R in conjunction with VBE of the PNP determines

when the pass transistor begins conducting; this circuit is not

short circuit proof. Input/Output differential voltage minimum is

increased by VBE of the pass resistor.

Short circuit current limit is essentially set by the VBE of Q2 and

R1. ISC = ((VBEQ2 − ib * R2) / R1) + IO(max) Regulator

0.1

0.01

100

125

150

IO, Output Current (mA)

Cout = 1 mF to 10 mF

TA = 40°C to 125°C

Vin = up to 6.0 V

UNSTABLE

STABLE

Figure 29. Stability

Figure 30. Current Boost Regulator

Figure 31. Current Boost Regulator with Short

Circuit Limit

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