 |
データシートサーチシステム |
|
|
データシートサーチシステム |
|
L9945 データシート(PDF) 25 Page - STMicroelectronics |
|
|
|||||||||||||||||||||||||||||
L9945 データシート(HTML) 25 Page - STMicroelectronics |
|
|
25 / 144 page  Figure 12. Output pre-driver control CM IPU IPD CM IPU IPD VGBHI NFET ou Ratings: CM = 50 V for 12 V systems, 100 V for 24 V and 48 V systems. tput control NONx = 0 or SPI_ON_OUTxx = 1 NONx = 1 or SPI_ON_OUTxx = 0 To load or battery To load or ground To load VPS RPU NONx = 1 or SPI_ON_OUTxx = 0 NONx = 0 or SPI_ON_OUTxx = 1 PFET output control RG RG GADG2702171056PS The pull up/pull down currents can be programmed via SPI through the GCC_config_xx bit, as shown in the table below: Table 14. Selection of gate charge/discharge currents GCC_config_xx IPU / IPD [mA] 00 Limited by external resistor (RG) Internally clamped to ICh0Gx/IDCh0Gx 01 20 10 5 11 1 In case GCC_config_xx is programmed "0b00", an external resistor RG is required for protecting the transistor gate against excessive current: the resistor must be mounted in series on the IPU / IPD path, as shown in Figure 12. However, to prevent charge pump stress, the device internally limits the maximum charge/discharge current to ICh0Gx/IDCh0Gx (refer to Table 15). External measures have to be taken to keep the external MOS reliably OFF in case of output three-state. For external NMOS a gate pull down resistor RPD is needed and for external PMOS a gate pull up resistor RPU is necessary (refer to Figure 12). In order to improve EMI behavior, an external Miller capacitor CM can be mounted between transistor gate and drain. Value of this capacitor depends on: • The switching frequency required by the application; • The programmed charge/discharge current. The AN "How To Improve EMI Behavior In Switching Applications" provides a guideline for CM selection. It also helps choosing the right value for IPU/IPD in order to reduce EMI. 5.4.5 Internal and external clamping The device guarantees a maximum gate to source voltage of 20 V by means of an internal clamping circuitry which limits the overdrive. However, such a clamp is not intended as a protection against external spikes or failures (STB/STG). L9945 Functional description DS12275 - Rev 10 page 25/144 |
|
リンク URL |
| ALLDATASHEETはお客様のビジネスに役立ちますか？ [ DONATE ] |
Alldatasheetは | 広告 | お問い合わせ | プライバシーポリシー | データシートへのリンク | リンク交換 | メーカーリスト All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Japanese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
