ST L6227Q User Manual

L6227Q

DMOS dual full bridge driver with PWM current controller

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

■Non dissipative overcurrent protection

■Dual independent constant tOFF PWM current controllers

■Slow decay synchronous rectification

■Cross conduction protection

■Thermal shutdown

■Under voltage lockout

■Integrated fast free wheeling diodes

Applications

■Bipolar stepper motor

■Dual or quad DC motor

VFQFPN32 5 mm x 5 mm

Description

The L6227Q is a DMOS dual full bridge designed for motor control applications, realized in BCDmultipower technology, which combines isolated DMOS power transistors with CMOS and bipolar circuits on the same chip. The device also includes two independent constant off time PWM current controllers that performs the chopping regulation. Available in VQFPN32 5 mm x 5 mm package, the L6227Q features a non-dissipative overcurrent protection on the high side power MOSFETs and thermal shutdown.

Figure 1. Block diagram

VBOOT	VBOOT						VSA
			VBOOT		VBOOT
VCP	CHARGE
	PUMP
		OCDA	OVER
			CURRENT
			DETECTION				OUT1A
		THERMAL	10V		10V		OUT2A
		PROTECTION
ENA			GATE
IN1A			LOGIC
							SENSEA
IN2A
	VOLTAGE			PWM
	REGULATOR		ONE SHOT	MASKING		+
			MONOSTABLE	TIME	SENSE	-	VREFA
					COMPARATOR
	10V	5V					RCA
					BRIDGE A
			OVER				VSB
							OUT1B
		OCDB	CURRENT
			DETECTION				OUT2B
			GATE				SENSEB
ENB							VREFB
			LOGIC
							RCB
IN1B
IN2B					BRIDGE B
						D99IN1085A

January 2009

Rev 3

1/27

www.st.com

Contents	L6227Q

Contents

1	Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		. 3
	1.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.2	Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
	1.3	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
2	Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		5
3	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
4	Circuit description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		10
	4.1	Power stages and charge pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	10
	4.2	Logic inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	11
	4.3	Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.4	PWM current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.5	Slow decay mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
	4.6	Non-dissipative overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
	4.7	Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
5	Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		19
6	Output current capability and IC power dissipation . . . . . . . . . . . . . .		21
7	Thermal management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		22
8	Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		23
9	Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		25
10	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		26

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L6227Q	Electrical data

1 Electrical data

1.1Absolute maximum ratings

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

1.2Recommended operating conditions

Table 2.		Recommended operating conditions
Symbol			Parameter	Parameter	Min	Max	Unit
	VS		Supply voltage	VSA = VSB = VS	8	52	V
			Differential voltage between	VSA = VSB = VS;
	VOD		VSA, OUT1A, OUT2A, SENSEA and			52	V
				VSENSEA = VSENSEB
			VSB, OUT1B, OUT2B, SENSEB
VREFA, VREFB			Voltage range at pins VREFA and		-0.1	5	V
			VREFB
V	SENSEA,		Voltage range at pins SENSE and	(pulsed tW < trr)	-6	6	V
			A
VSENSEB			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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Electrical data	L6227Q

1.3Thermal data

Table 3.	Thermal data
Symbol	Parameter	Value	Unit
R	Thermal resistance junction-ambient max (1).	42	° C/W
th(JA)

1.Mounted on a double-layer FR4 PCB with a dissipating copper surface of 0.5 cm2 on the top side plus 6 cm2 ground layer connected through 18 via holes (9 below the IC).

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L6227Q	Pin connection

2 Pin connection

Figure 2. Pin connection (top view)

Note: 1 The pins 2 to 8 are connected to die PAD

2 The die PAD must be connected to GND pin

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	Pin connection			L6227Q
	Table 4.	Pin description
	N°	Pin	Type	Function
	1, 21	GND	GND	Signal ground terminals.
	9	OUT1B	Power output	Bridge B output 1.
	11	RCB	RC pin	RC network pin. A parallel RC network connected between this pin and
				ground sets the current controller OFF-time of the bridge B.
	12	SENSEB	Power supply	Bridge B source pin. This pin must be connected to power ground through a
				sensing power resistor.
	13	IN1B	Logic input	Bridge B input 1
	14	IN2B	Logic input	Bridge B input 2
	15	VREF	Analog input	Bridge B current controller reference voltage.
		B		Do not leave this pin open or connect to GND.
				Bridge B enable. LOW logic level switches OFF all power MOSFETs of bridge
	16	EN	Logic input (1)	B. This pin is also connected to the collector of the overcurrent and thermal
		B		protection transistor to implement over current protection.
				If not used, it has to be connected to +5 V through a resistor.
	17	VBOOT	Supply	Bootstrap voltage needed for driving the upper power MOSFETs of both
			voltage	bridge A and Bridge B.
	19	OUT2B	Power output	Bridge B output 2.
	20	VSB	Power supply	Bridge B power supply voltage. It must be connected to the supply voltage
				together with pin VSA.
	22	VSA	Power supply	Bridge A power supply voltage. It must be connected to the supply voltage
				together with pin VSB.
	23	OUT2A	Power output	Bridge A output 2.
	24	VCP	Output	Charge pump oscillator output.
				Bridge A enable. LOW logic level switches OFF all power MOSFETs of bridge
	25	EN	Logic input (1)	A. This pin is also connected to the collector of the overcurrent and thermal
		A		protection transistor to implement over current protection.
				If not used, it has to be connected to +5 V through a resistor.
	26	VREF	Analog input	Bridge A current controller reference voltage.
		A		Do not leave this pin open or connect to GND.
	27	IN1A	Logic input	Bridge A logic input 1.
	28	IN2A	Logic input	Bridge A logic input 2.
	29	SENSEA	Power supply	Bridge A source pin. This pin must be connected to power ground through a
				sensing power resistor.
	30	RCA	RC pin	RC network pin. A parallel RC network connected between this pin and
				ground sets the current controller OFF-time of the bridge A.
	31	OUT1A	Power output	Bridge A output 1.

1.Also connected at the output drain of the over current and thermal protection MOSFET. Therefore, it has to be driven putting in series a resistor with a value in the range of 2.2 kΩ - 180 kΩ, recommended 100 kΩ.

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L6227Q	Electrical characteristics

3 Electrical characteristics

Table 5.	Electrical characteristics (TA = 25 °C, Vs = 48 V, unless otherwise specified)
Symbol	Parameter			Test condition	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	mA
		TJ = -25 °C to 125 °C (1)
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		2.7	Ω
IDSS	Leakage current	EN = Low; OUT = VS						2	mA
		EN = Low; OUT = GND			-0.3				mA
Source drain diodes
VSD	Forward ON voltage	ISD = 1.4 A, EN = LOW				1.15		1.3	V
trr	Reverse recovery time	If = 1.4 A				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	7 V 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	=1.4 A, resistive load	40			250	ns
RISE
t	Enable to out turn OFF delay time (2)	I	LOAD	=1.4 A, resistive load	500	800		1000	ns
D(off)EN
tD(off)IN	Input to out turn OFF delay time	ILOAD =1.4 A, resistive load			500	800		1000	ns
tFALL	Output fall time (2)	ILOAD =1.4 A, resistive load			40			250	ns
tdt	Dead time protection				0.5	1			µs
fCP	Charge pump frequency	-25 °C < TJ < 125 °C				0.6		1	MHz

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Electrical characteristics									L6227Q
Table 5.	Electrical characteristics (continued) (TA = 25 °C, Vs = 48 V, unless otherwise specified)
Symbol	Parameter			Test condition			Min	Typ	Max	Unit
PWM comparator and monostable
IRCA, IRCB	Source current at pins RCA and RCB	VRCA = VRCB = 2.5 V					3.5	5.5		mA
Voffset	Offset voltage on sense comparator	VREFA, VREFB = 0.5 V						±5		mV
tPROP	Turn OFF propagation delay (3)							500		ns
tBLANK	Internal blanking time on SENSE pins							1		µs
tON(MIN)	Minimum on time							2.5	3	µs
tOFF	PWM recirculation time	ROFF = 20 kΩ;				COFF = 1 nF		13		µs
		ROFF = 100 kΩ; COFF = 1 nF						61		µs
IBIAS	Input bias current at pins VREFA and								10	µA
	VREFB
Over current protection
I	Input supply overcurrent protection	T		= -25 °C to 125 °C (1)				2.8		A
SOVER	threshold		J
ROPDR	Open drain ON resistance	I = 4 mA						40	60	Ω
t	OCD turn-on delay time (4)	I = 4 mA; C			EN	< 100 pF		200		ns
OCD(ON)
t	OCD turn-off delay time (4)	I = 4 mA; C			EN	< 100 pF		100		ns
OCD(OFF)

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

2.See Figure 3 on page 9

3.Measured applying a voltage of 1 V to pin SENSE and a voltage drop from 2 V to 0 V to pin VREF.

4.See Figure 4 on page 9

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L6227Q	Electrical characteristics

Figure 3. Switching characteristic definition

EN

Vth(ON)

Vth(OFF)

t

IOUT

90%

10%

t

D01IN1316

tFALL	tRISE
tD(OFF)EN	tD(ON)EN

Figure 4. Overcurrent detection timing definition

IOUT

ISOVER

ON

BRIDGE

OFF

VEN
90%
10%
tOCD(ON)	D02IN1399
	tOCD(OFF)

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