TD310 Datasheet, PDF (4/9 Pages) STMicroelectronics – TRIPLE IGBT/MOS DRIVER

TD310
UVLO/stbdy pin functionning modes
Due to the wide supply voltage range of the TD310, the UVLO function (Under Voltage Lock Out) is
externally adjustable by a resistor bridge.
The bridge rate can be calculated in relation with the expected UVLO protection level as follows :
V_UVLO
x
R1
R1+R2
=1.2V
(where
R1
is
the
lower
resistor
of
the
bridge)
The internal resistor sets the default UVLO value to 12V (*) and might influence the external bridge rate if
the values of the external resistors are too high.
The standby threshold value depends of the UVLO value as follows :
V_stdby = ^0.7⁄1.2 V_UVLO
Both UVLO and stdby functions can be inhibited by connecting the UVLO/stdby pin to V_CC+ via a pull up
resistor (ex 150kΩ).
The following table summarizes the functions of the TD310 :
Normal
Stdby
UVLO
Pin
16
9/11
5
2/3/4 15/14 6 7/8/10
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Configuration UVLO/stdby Sense+/Sense- Enabl In A/B/C Out Alarm Op. Consumption
e
A/B/C
Amp.
+> -
X
X
L
L
1
H
H
IN
IN
OK H (1.5mA)
+< -
H
L
X
L
+> -
L
2
L
X
X
L
HZ L (30µA)
+< -
H
3
M
X
X
X
L
L OK
H
Configuration 1 : UVLO/stdby = H
The TD310 is in a normal consumption state (1.5mA), the operational amplifier is normally functionning
and the buffer outputs are determined by the sense comparator inputs, the enable inputs and the buffer
inputs.
Configuration 2 : UVLO/stdby = L
The TD310 is in a low consumption state (standby mode 30µA), the buffer outputs are set to low state and
the operational amplifier is in high impedance state.
Configuration 3 : UVLO/stdby = M
The V_CC supply voltage is between V_UVLO and V_stdby (**). The TD310 remains in a normal consumption
state and the operational amplifier is normally functionning but the buffer outputs and the alarm pin are set
to low state.
(*) If the UVLO level remains unadjusted, it is recommended to bypass the UVLO/stdby pin with a 1nF capacitor.
(**) If the supply voltage falls below Vstdby, the TD310 is set in standby mode (configuration 2).
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