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PDF AN556 Data sheet ( Hoja de datos )
| Número de pieza | AN556 | |
| Descripción | THE L6353: A SMART GATE DRIVER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AN556 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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t4U.com AN556
ee APPLICATION NOTE
taSh THE L6353:
a A SMART GATE DRIVER
.D by: C. Adragna and G. Comandatore
wwThe superior performance of voltage controlled switch makes this device the preferred one in modern
w power electronics applications.
The L6353 is a new monolithic integrated circuit designed to realise a versatile and smart interface
between the signal circuitry and every kind of voltage controlled power switch, with a minimal design
time and a reduction of parts count.
omDevice Description
.cThe L6353 is a smart silicon device which integrates all the circuitry for a versatile and rugged gate
driver. The chip implements several features such as: an easy-to-link signal source by means of either
an optocoupler or pulse transformer, a two-step turn-on procedure of the external power switch (dedi-
cated to IGBT driving), a switch dropout voltage monitoring, the possibility to give a negative bias to the
Ugate, the external programmability of safety thresholds and delays, the syncronisation and edge aligning
and a powerful buffer of ±8A with split output.
t4To introduce the device see fig.1 which shows the functional diagram:
eFigure 1. L6353 - Functional diagram
taSheSELECT
www.DaINPUT
2.5V
300mA
+
1.25V -
+ FILTER
200ns
-
DELAY
+
-
3.15V
Suppl y
UV Lockout
References
OUT1
CLAMPING
THERMAL
SHUTDOWN
LOGIC
- 3.15V
REF
VPOS
OUT1
CLAMP-PROG
OUT2
VSS
MON-DELAY
+
INV-OUT 1.25V
ALARM
AN556/0497
3.75V
COM
-
om+ 3.75V
.cVON-SENSE
+
UON-LEV-PROG
t4-
e7.5V
www.DataShe 1/16
1 page  
AN556 APPLICATION NOTE
The relationship between the RC parts value and the internal timing circuitry is:
tDELAY = RDEL CDEL
[1]
where:
RDEL is the timing resistance [kΩ]
CDEL is the timing capacitance [µF]
tDELAY is the input to output delay time [µs]
tDELAY should be calibration on the difference in response time of the external parts (e.g. optocoupler,
switch).
The DELAY pin always needs a pull-up resistor.
Protection against failure
To avoid system damage, it is mandatory not to exceed the SOA of the selected switch. To better under-
stand how to respect these limits, the relationships describing the operating conditions of a voltage con-
trolled switch are here reminded:
Is ≈ 0
Vg < Vth
(off mode)
[2a]
Is ∝ Vd
Is ∝ (Vg-Vth)2
Vd < Vg-Vth (on mode)
Vd > Vg-Vth (linear mode)
[2b]
[2c]
where :
Is is the current through the switch
Vd is the switch drop voltage
Vth is the activation threshold voltage
Vg is the driving gate voltage
The [2a] states that the switch current is negligible as long as the gate voltage is under the activation
threshold; the [2b] states that the on state voltage drop across a well driven switch is usually very low;
the [2c] states that the voltage drop across a bad-working switch, is always higher.
Protection against steady-state switch overload
The equations [2b] and [2c] suggest an easy way for a load failure detection by monitoring the switch
voltage drop. The L6353 performs this function connecting the ON-SENSE pin as shown fig.8. The func-
tion is turned off by shorting this pin to COM. The diode must be ultra-fast and have the same voltage
rating as the external switch. A load failure is detected by comparing the sense voltage to a reference
level. On failure detection, the L6353 turns off immediately (<400ns) the switch and sets the ALARM low.
The INPUT falling edge resets the driver. For an improved versatility, the ON-LEV-PROG pin allows to
Figure 8. Load failure protection
REF
100nF
SELECT
100nF
I NPUT
Supply
UV Lockout
References
RH RL
ON-LEV-PROG
Vcc
Iswitch
+
-
200 µA
ON-SENSE
Vdrop-switch
Power & Control
OUT1
Vgate
OUT2
COM
5/16
5 Page 
AN556 APPLICATION NOTE
Promotional tool for L6353
Fig.16 shows a printed circuit board where it is possible to assembly one of the following circuits with
possibility to try different set-ups: (optocoupler either open-collector with a pull-up resistor or totem-pole
output needing 5V supply; a switch which can be either MOSFET or IGBT with a free-wheeling diode
mounted on a heat-sink).For more complex configurations like inverter legs, bridge etc. two or more of
them can be connected together.
The PCB has also the aim to introduce a few layout rules to avoid interference and parasitic effects
which arise switching high current. Firstly, on single-supply driving, a minimal track length between VSS
and COM pins is mandatory. On the supply tracks, the capacitor location is very close to the IC pins.
The pin COM must be connected near the supply capacitor. It is necessary to take special care of the
switch pin used for both power and control, which is connected to the supply capacitor by a separated,
wide and short track. Finally, a ground track must be put under each optocoupler to improve its dV/dt im-
munity.
Figure 16. Printed Circuit Board (scale 1:1)
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AN556.PDF ] | |
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