ST L6226 User Manual

L6226

DMOS dual full bridge driver

Features

■Operating supply voltage from 8 to 52 V

■2.8 A output peak current (1.4 A DC)

■RDS(on) 0.73 Ω typ. value @ TJ = 25 °C

■Operating frequency up to 100 kHz

■Programmable high side overcurrent detection and protection

■Diagnostic output

■Paralleled operation

■Cross conduction protection

■Thermal shutdown

■Undervoltage lockout

■Integrated fast free wheeling diodes

Applications

■Bipolar stepper motor

■Dual or quad DC motor

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Description

The L6226 is a DMOS dual full bridge designed for motor control applications, realized in MultiPower-BCD technology, which combines isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. Available in PowerDIP24 (20+2+2), PowerSO36 and SO24 (20+2+2) packages, the L6226 features thermal shutdown and a non-dissipative overcurrent detection on the high side power MOSFETs plus a diagnostic output that can be easily used to implement the overcurrent protection.

Figure 1. Block diagram

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October 2009

Doc ID 9452 Rev 4

1/31

www.st.com

Contents	L6226

Contents

1	Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
	1.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.2	Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.3	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2	Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		8
4	Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		11
	4.1	Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.2	Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.3	Non-dissipative overcurrent detection and protection . . . . . . . . . . . . . . .	13
	4.4	Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
5	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		17
6	Paralleled operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		18
	6.1	Output current capability and IC power dissipation . . . . . . . . . . . . . . . . .	21
7	Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		23
8	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		25
9	Ordering codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		29
10	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		30

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L6226	Maximum ratings

1 Maximum ratings

1.1Absolute maximum ratings

	Table 1.	Absolute maximum ratings
	Symbol	Parameter	Test conditions	Value	Unit
	VS	Supply voltage	VSA = VSB = VS	60	V
		Differential voltage between	VSA = VSB = VS = 60V;
	VOD	VSA, OUT1A, OUT2A, SENSEA		60	V
		and VSB, OUT1B, OUT2B,	VSENSEA = VSENSEB = GND
		SENSEB
	OCDA,	OCD pins voltage range		-0.3 to +10	V
	OCDB
	PROGCLA,	PROGCL pins voltage range		-0.3 to +7	V
	PROGCLB
	VBOOT	Bootstrap peak voltage	VSA = VSB = VS	VS + 10	V
	VIN,VEN	Input and enable voltage range		-0.3 to +7	V
	VSENSEA,	Voltage range at pins SENSEA and		-1 to +4	V
	VSENSEB	SENSEB
		Pulsed supply current (for each VS
	IS(peak)	pin), internally limited by the	VSA = VSB = VS; tPULSE < 1ms	3.55	A
		overcurrent protection
	IS	RMS supply current	VSA = VSB = VS	1.4	A
		(for each VS pin)
	Tstg, TOP	Storage and operating		-40 to 150	°C
		temperature range

1.2Recommended operating conditions

Table 2.			Recommended operating conditions
Symbol			Parameter	Test conditions	Min.	Max.	Unit
	VS		Supply voltage	VSA = VSB = VS	8	52	V
			Differential voltage between	VSA = VSB = VS;
	VOD		VSA, OUT1A, OUT2A, SENSEA			52	V
			and VSB, OUT1B, OUT2B,	VSENSEA = VSENSEB
			SENSEB
V	SENSEA	,	Voltage range at pins SENSE	(pulsed tW < trr)	-6	6	V
			A
VSENSEB			and SENSEB	(DC)	-1	1	V
	IOUT		RMS output current			1.4	A
	TJ		Operating junction temperature		-25	+125	°C
	fsw		Switching frequency			100	kHz

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Maximum ratings	L6226

1.3Thermal data

Table 3.	Thermal data
Symbol	Description	PowerDIP24	SO24	PowerSO36	Unit
Rth-j-pins	Maximum thermal resistance junction-pins	19	15	-	°C/W
Rth-j-case	Maximum thermal resistance junction-case	-	-	2	°C/W
Rth-j-amb1	Maximum thermal resistance junction-ambient 1	44	52	-	°C/W
Rth-j-amb1	Maximum thermal resistance junction-ambient 2	-	-	36	°C/W
Rth-j-amb1	Maximum thermal resistance junction-ambient 3	-	-	16	°C/W
Rth-j-amb2	Maximum thermal resistance junction-ambient 4	59	78	63	°C/W

4/31	Doc ID 9452 Rev 4

L6226	Pin connections

2 Pin connections

Figure 2. Pin connections

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1. The slug is internally connected to pins 1,18,19 and 36 (GND pins).

Table 4.	Pin description
	Pin n.
			Name	Type	Function
SO24/		PowerSO36
PowerDIP24
1		10	IN1A	Logic input	Bridge A logic input 1.
2		11	IN2A	Logic input	Bridge A logic input 2.
				Power	Bridge A source pin. This pin must be
3		12	SENSEA		connected to power ground directly or
				supply
					through a sensing power resistor.
					Bridge A overcurrent detection and thermal
				Open drain	protection pin.An internal open drain
4		13	OCDA		transistor pulls to GND when overcurrent
				output	on bridge A is detected or in case of
					thermal protection.
5		15	OUT1A	Power	Bridge A output 1.
				output
					Signal ground terminals. In Power DIP and
6, 7, 18, 19		1, 18, 19, 36	GND	GND	SO packages, these pins are also used for
					heat dissipation toward the PCB.
8		22	OUT1B	Power	Bridge B output 1.
				output

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Pin connections						L6226
	Table 4.	Pin description (continued)
		Pin n.
				Name	Type	Function
	SO24/		PowerSO36
	PowerDIP24
						Bridge B overcurrent detection and thermal
					Open drain	protection pin.An internal open drain
	9		24	OCDB		transistor pulls to GND when overcurrent
					output	on bridge B is detected or in case of
						thermal protection.
					Power	Bridge B source pin. This pin must be
	10		25	SENSEB		connected to power ground directly or
					supply
						through a sensing power resistor.
	11		26	IN1B	Logic input	Bridge B input 1
	12		27	IN2B	Logic input	Bridge B input 2
						Bridge B overcurrent level programming. A
						resistor connected between this pin and
						Ground sets the programmable current
	13		28	PROGCLB	R pin	limiting value for the bridge B. By
						connecting this pin to Ground the
						maximum current is set.This pin cannot be
						left non-connected.
						Bridge B enable. LOW logic level switches
	14		29	ENB	Logic input	OFF all Power MOSFETs of bridge B. If not
						used, it has to be connected to +5V.
					Supply	Bootstrap voltage needed for driving the
	15		30	VBOOT		upper Power MOSFETs of both bridge A
					voltage
						and bridge B.
	16		32	OUT2B	Power	Bridge B output 2.
					output
					Power	Bridge B power supply voltage. it must be
	17		33	VSB		connected to the supply voltage together
					supply
						with pin VSA.
					Power	Bridge A power supply voltage. it must be
	20		4	VSA		connected to the supply voltage together
					supply
						with pin VSB.
	21		5	OUT2A	Power	Bridge A output 2.
					output
	22		7	VCP	Output	Charge pump oscillator output.

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L6226						Pin connections
	Table 4.	Pin description (continued)
		Pin n.
				Name	Type	Function
	SO24/		PowerSO36
	PowerDIP24
						Bridge A enable. LOW logic level switches
	23		8	ENA	Logic input	OFF all Power MOSFETs of bridge A. If not
						used, it has to be connected to +5V.
						Bridge A overcurrent level programming. A
						resistor connected between this pin and
						Ground sets the programmable current
	24		9	PROGCLA	R Pin	limiting value for the bridge A. By
						connecting this pin to ground the maximum
						current is set.This pin cannot be left non-
						connected.

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Electrical characteristics	L6226

3 Electrical characteristics

	TA = 25 °C, VS = 48 V, unless otherwise specified
Table 5.	Electrical characteristics
Symbol	Parameter				Test conditions		Min	Typ	Max	Unit
VSth(ON)	Turn-on threshold						5.8	6.3	6.8	V
VSth(OFF)	Turn-off threshold						5	5.5	6	V
IS	Quiescent supply current	All bridges OFF;						5	10	m
		T		= -25 °C to 125 °C (1)
			J
Tj(OFF)	Thermal shutdown temperature							165		°C
Output DMOS transistors
RDS(ON)	High-side + low-side switch ON	TJ = 25 °C						1.47	1.69	Ω
	resistance	TJ =125 °C				(1)		2.35	2.70
IDSS	Leakage current	EN = Low; OUT = VS							2	mA
		EN = Low; OUT = GND					-0.3			mA
Source drain diodes
VSD	Forward ON voltage	ISD = 2.8A, EN = LOW						1.15	1.3	V
trr	Reverse recovery time	If = 1.4A						300		ns
tfr	Forward recovery time							200		ns
Logic input
VIL	Low level logic input voltage						-0.3		0.8	V
VIH	High level logic input voltage						2		7	V
IIL	Low level logic input current	GND logic input voltage					-10			µA
IIH	High level logic input current	7V logic input voltage							10	µA
Vth(ON)	Turn-on input threshold							1.8	2.0	V
Vth(OFF)	Turn-off input threshold						0.8	1.3		V
Vth(HYS)	Input threshold hysteresis						0.25	0.5		V
Switching characteristics
t	Enable to out turn ON delay time (2)	I	LOAD		=1.4 A, resistive load		500		800	ns
D(on)EN
tD(on)IN	Input to out turn ON delay time	ILOAD =1.4 A, resistive load						1.9		µs
		(dead time included)
t	Output rise time (2)	I	LOAD		=1.4A, resistive load		40		250	ns
RISE
t	Enable to out turn OFF delay time (2)	I	LOAD		=1.4A, resistive load		500	800	1000	ns
D(off)EN
tD(off)IN	Input to out turn OFF delay time	ILOAD =1.4A, resistive load					500	800	1000	ns
tFALL	Output fall time (2)	ILOAD =1.4A, resistive load					40		250	ns

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L6226					Electrical characteristics
Table 5.	Electrical characteristics (continued)
Symbol	Parameter	Test conditions			Min	Typ	Max	Unit
tdt	Dead time protection				0.5	1		µs
fCP	Charge pump frequency	-25°C<Tj <125°C				0.6	1	MHz
Over current detection
	Input supply over current detection	-25°C<Tj <125 °C; RCL= 39 kΩ			-10%	0.29	+10%
Is over	threshold	-25°C<Tj <125 °C; RCL= 5 kΩ			-10%	2.21	+10%	A
		-25°C<Tj <125 °C; RCL= GND			-30%	2.8	+30%
ROPDR	Open drain ON resistance	I = 4mA				40	60	Ω
t	OCD turn-on delay time (3)	I = 4mA; C	EN	< 100pF		200		ns
OCD(ON)
t	OCD turn-off delay time (3)	I = 4mA; C	EN	< 100pF		100		ns
OCD(OFF)

1.Tested at 25 °C in a restricted range and guaranteed by characterization

2.See Figure 3

3.See Figure 4

Figure 3. Switching characteristic definition

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Electrical characteristics	L6226

Figure 4. Overcurrent detection timing definition

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10/31

Doc ID 9452 Rev 4