L6375S 데이터 시트보기 (PDF) - STMicroelectronics

부품명

상세내역

제조사

L6375S

0.5A high-side driver industrial intelligent power switch

STMicroelectronics 

L6375S

Electrical specifications

2.8

Over current operation

In order to implement a short circuit protection the output power MOS is driven in linear

mode to limit the output current to the Isc (1.1A typical value). This condition (current limited

to the Isc value) lasts for a Ton time interval, that can be set by means of a capacitor (Cdon)

connected to the ON DELAY pin according to the following formula:

Ton = 1.28 µsec/pF

for

50pF< Cdon < 2nF

After the Ton interval has expired the output power MOS is switched off for the Toff time

interval with:

Toff = 64 ·Ton.

When also the Toff interval has expired, the out-put power MOS is switched ON. At this point

in time two conditions may occur

a) The overloads still present, and then the output power MOS is again driven in

linear mode (limiting the output current to ISC) for another TON, starting a new

cycle, or

b) the over load the overload condition is removed, and the output power MOS is no

longer driven in linear mode. All these occurrences are presented on the DIAG2

pin (see fig 2).

We call this unique feature Non Dissipative Short Circuit Protection and it ensures a very

safe operation even in permanent overload conditions. Note that choosing the most

appropriate value for the Ton interval (i.e. the value of the Cdon capacitor) a delay (the Ton

itself) will prevent that a misleading Short Circuit information is presented on the DIAG2

output, when driving capacitive loads (that acts like short circuit in the very beginning)

or Incandescent Lamp (a cold filament has a very low resistive value). The Non Dissipative

Short Circuit Protection can be disabled (keeping Ton = 0 but with the output current still

limited to Isc, and Diagnostic disabled) simply shorting to ground the ON DELAY pin.

Figure 4. Non dissipative short circuit protection operation

9/17

Share Link: