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參數(shù)資料
| 型號： | AN32502A |
| 英文描述： | For Information·Communication - PDA |
| 中文描述： | 信息·通訊-掌上電腦 |
| 文件頁數(shù)： | 40/45頁 |
| 文件大?。?/td> | 574K |
| 代理商： | AN32502A |
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40
SDF00034AEB
AN32502A
Publication data: November 2002
HC4 output
LC4 output
80 nsec
80 nsec
On
Off
Off
Off
Off
Off
Off
Off
On
On
On
On
On
On
Off
td
td
Figure 6
8
2) Output voltage
Output voltage from HC4 and LC4 is applied with a dead time of 80 nsec so that simultaneous on of Q41 and 42 may not
cause a through-current to flow. Refer to figure 6
8 for timing.
Application Notes (continued)
6
.
Explanation of operation (continued)
Ch.4 (continued)
3) On/off control
Ch.4 is able to on/off control by pin 57 and serial data.
4) Power supply voltage and GND
Power is supplied from pin 19 (VB5) only for the output drive stage and from pin 46 (VB1) for other parts.
GND is connected from pin 16 (PGND4) only for output drive stage. Other parts are connected to the signal system GND of
pin 6 (SGND). Q41 source, D41 anode and C42GND side should be connected with a fat wire as near to pin 16 as possible.
5) Peripheral parts
The characteristics of output capacitor C42 has an effect on output transient response characteristics.
It is recommended to use a high ESR capacitor like our SPCAP.
It is also recommended to select the constant of 10
μ
H for inductor L4 in the supply voltage range of this IC (2.8 V to 5.8 V)
considering efficiency degradation caused by size and DC resistance.
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