NCP623, NCV8623

www.onsemi.com

8

Figure 4. NCP623 Wake−up Improvement with Small PNP Transistor

1 ms

30

ms

NCP623 Without

Wake−up Improvement

(Typical Response)

NCP623 With

Wake−up Improvement

(Typical Response)

The PNP connected to the bypass pin does not degrade the

noise response of the NCP623. Figure 5 displays the noise

density using the setup in Figure 3. The typical noise level

is 26

Frequency (Hz)

100

1,000

350

200

150

100

1,000,000

50

10,000

Figure 5. Noise Density of the NCP623 with a 10 nF

Bypass Capacitor and a Wake−up Improvement Network

100,000

250

300

0

Output Noise = 26

mVrms

C = 10 nF @ 100 Hz − 100 kHz