ST L6391 User Manual

L6391

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

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

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

			"//4342!0 $2)6%2	&,/!4).' 3425#452%
6##								"//4
			FROM ,6'	56
		56
				$%4%#4)/.
		$%4%#4)/.
						(6'
						$2)6%2
().				,%6%,		3		(6'
				3()&4%2		2
		6	,/')#
			3(//4
			4(2/5'(
			02%6%.4)/.					/54
,).						6##
							,6'
							$2)6%2
								,6'
3$ /$
			3-!24		6
			3$	#/-0!2!4/2
								#0
								#0
$4			$%!$
			4)-%
'.$
							!-V

Doc ID 17892 Rev 1

3/21

Pin connection	L6391

2 Pin connection

Figure 2. Pin connection (top view)

										#005
	-*/
										)7(
	4% 0%
	)*/									065
	7$$									/$
	%5
										-7(
	/$									$1
	(/%									$1
										!-V

Table 2.	Pin description
Pin n #	Pin name					Type	Function
1						I	Low side driver logic input (active low)
			LIN
							Shut down logic input (active low)/open drain
2		SD/OD (1)				I/O
							comparator output
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
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
13		HVG (1)				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
								HIN	LVG		HVG
		SD				LIN
		L				X		X	L		L
		H				H		L	L		L
		H				L		H	L		L
		H				L		L	H		L
		H				H		H	L		H
Note:	X: don't care

Doc ID 17892 Rev 1

5/21

Electrical data	L6391

4 Electrical data

4.1Absolute maximum ratings

	Table 4.	Absolute maximum rating
	Symbol	Parameter		Value		Unit
			Min		Max
	Vcc	Supply voltage	-0.3		21	V
	Vout	Output voltage	Vboot - 21		Vboot + 0.3	V
	Vboot	Bootstrap voltage	-0.3		620	V
	Vhvg	High side gate output voltage	Vout - 0.3		Vboot + 0.3	V
	Vlvg	Low side gate output voltage	-0.3		Vcc + 0.3	V
	Vcp-	Comparator negative input voltage	-0.3		Vcc + 0.3	V
	Vcp+	Comparator positive input voltage	-0.3		Vcc + 0.3	V
	Vi	Logic input voltage	-0.3		15	V
	VOD	Open drain voltage	-0.3		15	V
	dVout/dt	Allowed output slew rate			50	V/ns
	Ptot	Total power dissipation (TA = 25 °C)			800	mW
	TJ	Junction temperature			150	°C
	Tstg	Storage temperature	-50		150	°C
Note:	ESD immunity for pins 12, 13 and 14 is guaranteed up to 1 kV (human body model)

4.2Thermal data

Table 5.	Thermal data
Symbol	Parameter	SO-14	DIP-14	Unit
Rth(JA)	Thermal resistance junction to ambient	165	100	°C/W

6/21	Doc ID 17892 Rev 1

L6391	Electrical data

4.3Recommended operating conditions

Table 6.	Recommended operating conditions
Symbol	Pin	Parameter	Test condition	Min	Max	Unit
Vcc	4	Supply voltage		12.5	20	V
(1)	14-12	Floating supply voltage		12.4	20	V
VBO
V	12	DC output voltage		- 9 (2)	580	V
out
		Comparator negative			(3)
VCP-	8	input voltage	VCP+ [ 2.5 V		VCC	V
VCP+		Comparator positive			(3)
	9	input voltage	VCP- [ 2.5 V		VCC	V
fsw		Switching frequency	HVG, LVG load CL = 1 nF		800	kHz
TJ		Junction temperature		-40	125	°C

1.VBO = Vboot - Vout

2.LVG off. Vcc = 12.5 V

Logic is operational if Vboot > 5 V

3.At least one of the comparator's input must be lower than 2.5 V to guarantee proper operation.

Doc ID 17892 Rev 1

7/21