ST L6391 User Manual
High-voltage high and low side driver
Features
■ High voltage rail up to 600 V
■ dV/dt immunity ± 50 V/nsec in full temperature
range
■ Driver current capability:
– 290 mA source,
– 430 mA sink
■ Switching times 75/35 nsec rise/fall with 1 nF
load
■ 3.3 V, 5 V TTL/CMOS inputs with hysteresis
■ Integrated bootstrap diode
■ Comparator for fault protections
■ Smart shut-down function
■ Adjustable dead-time
■ Interlocking function
■ Compact and simplified layout
■ Bill of material reduction
■ Effective fault protection
■ Flexible, easy and fast design
L6391
Description
The L6391 is a high-voltage device manufactured
with the BCD “OFF-LINE” technology. It is a single
chip half-bridge gate driver for N-channel power
MOSFET or IGBT.
The high side (floating) section is designed to
stand a voltage rail up to 600 V. The logic inputs
are CMOS/TTL compatible down to 3.3 V for easy
interfacing microcontroller/DSP.
An integrated comparator is available for
protections against overcurrent, overtemperature,
etc.
Applications
■ Motor driver for home appliances, factory
automation, industrial drives and fans.
■ HID ballasts, power supply units.
Table 1. Device summary
Order codes Package Packaging
L6391N DIP-14 Tube
L6391D SO-14 Tube
L6391DTR SO-14 Tape and reel
December 2010 Doc ID 17892 Rev 1 1/21
www.st.com
21
Contents L6391
Contents
1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1 AC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2 DC operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6 Waveforms definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7 Smart shut down function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Typical application diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9 Bootstrap driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9.1 CBOOT selection and charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
11 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21 Doc ID 17892 Rev 1
L6391 Block diagram
1 Block diagram
Figure 1. Block diagram
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Doc ID 17892 Rev 1 3/21
Pin connection L6391
2 Pin connection
Figure 2. Pin connection (top view)
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Table 2. Pin description
Pin n # Pin name Type Function
1 LIN
2 SD/OD
3 HIN I High side driver logic input (active high)
4 VCC P Lower section supply voltage
5 DT I Dead time setting
6 NC Not connected
7 GND P Ground
8 CP- I Comparator negative input
I Low side driver logic input (active low)
(1)
I/O
Shut down logic input (active low)/open drain
comparator output
!-V
9 CP+ I Comparator positive input
10 LVG
(1)
O Low side driver output
11 NC Not connected
12 OUT P High side (floating) common voltage
(1)
13 HVG
O High side driver output
14 BOOT P Bootstrapped supply voltage
1. The circuit guarantees less than 1 V on the LVG and HVG pins (@ Isink = 10 mA), with VCC > 3 V. This
allows omitting the “bleeder” resistor connected between the gate and the source of the external MOSFET
normally used to hold the pin low; the gate driver assures low impedance also in SD condition.
4/21 Doc ID 17892 Rev 1
L6391 Truth table
3 Truth table
Table 3. Truth table
Input Output
SD
LXXLL
HHLL L
HLHLL
HLLHL
HHHL H
Note: X: don't care
LIN HIN LVG HVG
Doc ID 17892 Rev 1 5/21
Electrical data L6391
4 Electrical data
4.1 Absolute maximum ratings
Table 4. Absolute maximum rating
Val ue
Symbol Parameter
Min Max
Vcc Supply voltage -0.3 21 V
Output voltage V
out
Bootstrap voltage -0.3 620 V
boot
High side gate output voltage V
hvg
Low side gate output voltage -0.3 Vcc + 0.3 V
lvg
Comparator negative input voltage -0.3 Vcc + 0.3 V
cp-
Comparator positive input voltage -0.3 Vcc + 0.3 V
cp+
V
Logic input voltage -0.3 15 V
i
Open drain voltage -0.3 15 V
OD
/dt Allowed output slew rate 50 V/ns
Total power dissipation (TA = 25 °C) 800 mW
tot
Junction temperature 150 °C
J
Storage temperature -50 150 °C
stg
dV
V
V
V
V
V
V
V
out
P
T
T
- 21 V
boot
- 0.3 V
out
+ 0.3 V
boot
+ 0.3 V
boot
Unit
Note: ESD immunity for pins 12, 13 and 14 is guaranteed up to 1 kV (human body model)
4.2 Thermal data
Table 5. Thermal data
Symbol Parameter SO-14 DIP-14 Unit
R
th(JA)
Thermal resistance junction to ambient 165 100 °C/W
6/21 Doc ID 17892 Rev 1
L6391 Electrical data
4.3 Recommended operating conditions
Table 6. Recommended operating conditions
Symbol Pin Parameter Test condition Min Max Unit
V
cc
(1)
V
BO
V
out
V
CP-
V
CP+
f
sw
T
J
1. VBO = V
2. LVG off. Vcc = 12.5 V
Logic is operational if V
3. At least one of the comparator's input must be lower than 2.5 V to guarantee proper operation.
4 Supply voltage 12.5 20 V
14-12 Floating supply voltage 12.4 20 V
12 DC output voltage - 9
Comparator negative
8
input voltage
Comparator positive
9
input voltage
[ 2.5 V V
V
CP+
V
[ 2.5 V V
CP-
(2)
Switching frequency HVG, LVG load CL = 1 nF 800 kHz
Junction temperature -40 125 °C
- V
boot
out
> 5 V
boot
580 V
(3)
CC
(3)
CC
V
V
Doc ID 17892 Rev 1 7/21
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