Datasheet

LM2622
SNVS068E –MAY 2000–REVISED MARCH 2013 www.ti.com
output, the voltage at C5 is 16V when referenced to ground. In the third stage, the 16V at C5 appears across C6
when the switch is closed. When the switch opens, C6 is referenced to the 8V output minus a diode drop, which
raises the voltage at C6 with respect to ground to about 24V. Hence, in the fourth stage, C7 is charged to 24V
when the switch is open. From the first stage to the last, there are three diode drops that make the output voltage
closer to 24 - 3xVDIODE (about 22.8V if a 0.4V forward drop is assumed).
Table 1. Components For Circuits in Figure 19
Component 600 kHz 1.3 MHz
L 10µH 4.7µH
COUT1 10µF 22µF
COUT2 10µF NOT USED
CC 3.9nF 1.5nF
CFB1 0.1µF 15nF
CFB2 NOT USED 560pF
CIN 10µF 22µF
C1 4.7µF 4.7µF
C2 0.1µF 0.1µF
C4 1µF 1µF
C5 1µF 1µF
C6 1µF 1µF
C7 1µF 1µF
RFB1 40.2kΩ 91kΩ
RFB2 7.5kΩ 18kΩ
RC 5.1kΩ 10kΩ
D1 MBRM140T3 MBRM140T3
D2
BAT54S BAT54S
D3
D4
BAT54S BAT54S
D5
D6
BAT54S BAT54S
D7
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