NCP1729

http://onsemi.com

8

Figure 20. Cascaded Devices for Increased Negative Output Voltage

+

6

4

2

3

1

OSC

Capacitors = 3.3

mF

+

5

+

6

4

2

3

1

OSC

+

5

+

Two or more devices can be cascaded for increased output voltage. Under light load conditions, the output voltage is

additional stage. This is due to a reduction of input voltage to each successive stage as the converter output is loaded. Note that

the ground connection for each successive stage must connect to the negative output of the previous stage. The performance

characteristics for a converter consisting of two cascaded devices are shown below.

Figure 21. Cascade Load Regulation, Output

Voltage vs. Output Current

−2.0

−4.0

−1.0

−5.0

−3.0

−10.0

020

40

−6.0

−7.0

−8.0

−9.0

10

30

A

B

A

5.0

145

B

3.0

180

Curve