l6380d STMicroelectronics, l6380d Datasheet - Page 2

• Manufacturer Part Number: l6380d
• Description: High Voltage High-side Driver
• Manufacturer: STMicroelectronics

L6380 - L6381
To drive the external power device the signal
coming from input logic is fed into a pulse gener-
ator that in turns drives the level shifting sructure
(that include two High Voltage DMOS) designed
to ensure low power dissipation and high noise
immunity. The output buffer (in Totem Pole ar-
rangement) is able to sink from or source to the
gate of the external device the current needed to
switch it ON or OFF.
The falling edge of the signal coming from the in-
put logic will turn ON while the rising edge will
turn OFF the driven power device. This operation
will ensure low current sinking from the HV rail
during commutations.
Current / Voltage Mode Operation
To select the Voltage Mode Operation the user
have to set on the RI pin a voltage higher than
the internal reference (7V). In this way the IC will
function as an inverting buffer driven by the LI in-
put pin (see Voltage Mode Timing Diagram).
If the voltage on RI input pin is lower than 7V the
Current Mode Operation will be enabled. In this
configuration the RI input will set the reference
L6381 BLOCK DIAGRAM
2/9
20K
CI
RI
LI
1.4V
7 V
+
+
-
-
V S
Current
Voltage
Mode
Mode
V S
S
R
Q
B. G.
REG.
V S
7V
10V
+
-
Under Voltage
GENERATOR
Comparator
voltage to the non inverting input of the Current
Mode Comparator (see block diagram), whose in-
verting input, the CI input pin, in allowable to
close a current control loop with a voltage drop
coming from a sense resistor. To summarise (see
Current Mode Timing Diagrams):
The output of the Current Mode Comparator will
mask the LI input whenever the CI voltage is
higher than the RI input (and the RI voltage is be-
low 7V).
Under Voltage Lockout
The output buffer if switched off whenever Vs de-
crease below Vth OFF.
The IC will remail in this shut down status until Vs
has risen above VthON, the hysteresis will pro-
vide a good noise immunity.
Applications
The L6380/L6381 can be used in motor control
applications (AC, DC and switched reluctance),
electronic ballasts, heating and welding, switching
power supplies and UPS.
PULSE
ON
SHIFTER
LEVEL
GND
BOOT
OFF
HVG
OUT
H.V.
D94IN078
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