 |
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
|
Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
L6376 Datasheet(PDF) 8 Page - STMicroelectronics |
|
||||||||||||||||||||||||||||||
L6376 Datasheet(HTML) 8 Page - STMicroelectronics |
|
|
8 / 12 page  In this way, the temperature of the device is kept enough low to prevent the intervention of the ther- mal protection (in most of the cases) and so to avoid the shut down of the whole device. If a short circuit condition is present on one out- put, the current limiting circuit puts that channel in linear mode — sourcing the ISC current (typically 800 mA) — for a time period (tON) defined by an external capacitor (CDON connected to the ON DELAY pin). After that period, if the short circuit condition is still present the output is turned off for another time period (tOFF) defined by a second external capacitor (CDOFF connected to the OFF DELAY pin). When also this period is expired: • if the short circuit condition is still present the output stays on for the tON period and the se- quence starts again; • if the short circuit condition is not present anymore the normal operation of the output is resumed. The tON and tOFF periods are completely inde- pendent and can be set from 64 µs to 15 ms, us- ing external capacitors ranging from 50 pF to 15 nF (1.28 µs/pF). If the OFF DELAY pin is tied to ground (i.e. the CDOFF capacitor is not used) the tOFF time period is 64 times the tON period. The diagnostic output (DIAG) is active when the output is switched off, while it is not active when the output is on (i.e. during the tON period) even if in that period a short circuit condition is present. Typical waveforms for short circuit operation are shown in figure 2. If both the ON DELAY and the OFF DELAY pins are grounded the non dissipative over current protection is inhibited and the outputs in short cir- cuit remain on until the thermal shutdown switch off the whole device. In this case the short circuit condition is not signalled by the DIAG pin (that continues to signal the under voltage and over temperature conditions). PROGRAMMABLE DIAGNOSTIC DELAY The current limiting circuits can be requested to perform even in absence of a real fault condition, for a short period, if the load is of capacitive na- ture or if it is a filament lamp (that exhibits a very low resistance during the initial heating phase). To avoid the forwarding of misleading — i.e. short diagnostic pulses in coincidence with the inter- vention of the current limiting circuits when oper- ating on capacitive loads — the activation of the diagnostic can be delayed with respect to the in- tervention of one of the current limiting circuits. This delay can be defined by an external capaci- tor (CDON) connected between the ON DELAY pin and ground. RESET INPUT An external reset input R (pin 18) is provided to simultaneously switch off all the outputs: this sig- nal (active low) is in effect an asynchronous reset that keeps the outputs low independently from the input signals. For example, this reset input can be used by the CPU to keep the outputs low after a fault condi- tion (signaled by the DIAG pin). DEMAGNETIZATION OF INDUCTIVE LOADS The device has four internal clamping diodes able to demagnetize inductive loads. The limitation is the peak power dissipation of the packages, so — if the loads are big or if there is the possibility to demagnetize more loads con- temporarly — it is necessary to use external de- magnetization circuits. In figures 4 and 5 are shown two topologies for the demagnetization versus ground and versus VS. The breakdown voltage of the external device (VZ) must be chosen considering the minimum in- ternal clamping voltage (Vcl) and the maximum supply voltage (VS). Vi Vs Vout 100mV D94IN131 1.25V 100mV Figure 3: Input Comparator Hysteresis L6376 8/12 |
Número de pieza similar - L6376 |
|
Descripción similar - L6376 |
|
|
|
Enlace URL |
| Política de Privacidad |
| ALLDATASHEET.ES |
| ¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes 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 |
Spanish ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
