Moteur de recherche de fiches techniques de composants électroniques |
|
CAT2300 Fiches technique(PDF) 4 Page - ON Semiconductor |
|
CAT2300 Fiches technique(HTML) 4 Page - ON Semiconductor |
4 / 7 page CAT2300 http://onsemi.com 4 TYPICAL PERFORMANCE CHARACTERISTICS Figure 3. Load Step: 1 A – 10 A 50 ms / div IBus VMEAS PIN DESCRIPTION Sense Sense connects directly to the SENSEFET’s Sense pin and directs the sensed current to the IMEAS output. Sense is controlled by an amplifier with a FET follower stage to maintain Sense at exactly the Kelvin voltage, thus insuring accuracy of the SENSEFET’s mirror current. KS KS = Kelvin Sense; a Kelvin connection for the mirroring amplifier. Current measurement accuracy is dependent upon the voltage match between the SENSEFET’s Sense and Kelvin leads. To minimize voltage losses in the PCB trace between CAT2300 and the SENSEFET, a Kelvin connection for the control amplifier is provided. KS must be a dedicated connection, shared by no other circuitry, and tied directly to the Sense pin on of the SENSEFET. Figure 4. Current Sense SENSEFET SENSEFET SENSEFET Careful layout is critical in achieving full SENSEFET perfomance. PCB trace resistance can no longer be ignored as it can be in typical low current circuit designs. Microvolt offsets ( mV) produce meaningful errors in current ratio tracking. A few milliohms of trace resistance carrying a few milliamps of current produces microvolts of potential difference between CAT2300 and the SENSEFET. To circumvent this error CAT2300 provides a Kelvin lead (KS) for monitoring the SENSEFET’s Sense pin. Under no circumstances should the KS connection share any portion of the current path between the sense pins of CAT2300 and the SENSEFET. Doing so will degrade measurement accuracy. Kelvin Kelvin connects directly to the SENSEFET’s Kelvin pin and acts the reference voltage for CAT2300’s mirroring circuit. It too must be a dedicated connection, shared by no other circuitry. Gate Gate connects to the SENSEFET’s Gate pin and controls the SENSEFET’s operation. Gate is controlled by EN: a logic 1 turns the SENSEFET ON, a logic 0 turns it OFF. When ON, voltage is applied to the SENSEFET’s gate via a current source inside CAT2300. By controlling the gate drive current a controlled turn-ON is achieved. Faster turn-on times can be done by adding a supplemental current source to augment the internal current source. Placing a resistor between VDD and Gate will provide extra current and boost turn-on speeds. For a softer turn-on characteristic, add capacitance between the SENSEFET’s Gate and Source pins; approximately 1 nF for every ms of increased delay. When switching OFF the SENSEFET, Gate provides a strong pull-down, 7.5 mA typical, so the SENSEFET will be switched off quickly. |
Numéro de pièce similaire - CAT2300 |
|
|
Lien URL |
Politique de confidentialité |
ALLDATASHEET.FR |
ALLDATASHEET vous a-t-il été utile ? [ DONATE ] |
À propos de Alldatasheet | Publicité | Contactez-nous | Politique de confidentialité | Echange de liens | Fabricants 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 |