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零件编号 | L6227 | ||
描述 | DMOS dual full bridge driver | ||
制造商 | STMicroelectronics | ||
LOGO | |||
1 Page
L6227
DMOS dual full bridge driver with PWM current controller
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Datasheet - production data
Features
Operating supply voltage from 8 to 52 V
2.8 A output peak current (1.4 A DC)
RDS(ON) 0.73 typ. value at 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
Undervoltage lockout
Integrated fast freewheeling diodes
Applications
Bipolar stepper motor
Dual DC motor
Description
The L6227 device is a DMOS dual full bridge
designed for motor control applications, realized
in BCD 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 PowerDIP24 (20 + 2 + 2),
PowerSO36 and SO24 (20 + 2 + 2) packages, the
L6227 device features a non-dissipative
overcurrent protection on the high-side Power
MOSFETs and thermal shutdown.
February 2014
This is information on a product in full production.
DocID9453 Rev 2
1/32
www.st.com
Electrical characteristics
4 Electrical characteristics
L6227
Symbol
Table 5. Electrical characteristics
(Tamb = 25 °C, Vs = 48 V, unless otherwise specified)
Parameter
Test conditions
Min. Typ. Max. Unit
VSth(ON) Turn-on threshold
VSth(OFF) Turn-off threshold
IS Quiescent supply current
Tj(OFF) Thermal shutdown temperature
Output DMOS transistors
All bridges OFF;
Tj = -25 °C to 125 °C(1)
5.8 6.3 6.8
5 5.5 6
V
V
5 10 mA
165 C
RDS(ON)
High-side + low-side switch ON
resistance
IDSS Leakage current
Tj = 25 °C
Tj = 125 °C(1)
EN = low; OUT = VS
EN = low; OUT = GND
1.47 1.69 W
2.35 2.7 W
2 mA
-0.3 mA
Source drain diodes
VSD Forward ON voltage
trr Reverse recovery time
tfr Forward recovery time
Logic input
ISD = 1.4 A, EN = LOW
If = 1.4 A
1.15 1.3
300
200
V
ns
ns
VIL
VIH
IIL
IIH
Vth(ON)
Vth(OFF)
Vth(HYS)
Low level logic input voltage
High level logic input voltage
Low level logic input current
High level logic input current
Turn-on input threshold
Turn-off input threshold
Input threshold hysteresis
Switching characteristics
tD(on)EN Enable to out turn ON delay time(2)
tD(on)IN
tRISE
tD(off)EN
tD(off)IN
tFALL
tdt
fCP
Input to out turn ON delay time
Output rise time(2)
Enable to out turn OFF delay time(2)
Input to out turn OFF delay time
Output fall time(2)
Deadtime protection
Charge pump frequency
GND logic input voltage
7 V logic input voltage
-0.3 0.8 V
2 7V
-10 µA
10 µA
1.8 2.0 V
0.8 1.3
V
0.25 0.5
V
ILOAD =1.4 A, resistive load 500
800 ns
ILOAD =1.4 A, resistive load
(deadtime included)
1.9
µs
ILOAD = 1.4 A, resistive load 40
250 ns
ILOAD = 1.4 A, resistive load 500 800 1000 ns
ILOAD = 1.4 A, resistive load 500 800 1000 ns
ILOAD = 1.4 A, resistive load 40
250 ns
0.5 1
µs
-25 °C <Tj < 125 °C
0.6 1 MHz
8/32 DocID9453 Rev 2
PWM current control
L6227
Figure 11 shows the magnitude of the Off time tOFF versus COFF and ROFF values. It can be
approximately calculated from the equations:
Equation 1
tRCFALL = 0.6 · ROFF · COFF
tOFF = tRCFALL + tDT = 0.6 · ROFF · COFF + tDT
where ROFF and COFF are the external component values and tDT is the internally generated
deadtime with:
Equation 2
20 K ROFF 100 K
0.47 nF COFF 100 nF
tDT = 1 µs (typical value)
Therefore:
Equation 3
tOFF(MIN) = 6.6 µs
tOFF(MAX) = 6 ms
These values allow a sufficient range of tOFF to implement the drive circuit for most motors.
The capacitor value chosen for COFF also affects the rise time tRCRISE of the voltage at the
pin RCOFF. The rise time tRCRISE will only be an issue if the capacitor is not completely
charged before the next time the monostable is triggered. Therefore, the on time tON, which
depends by motors and supply parameters, has to be bigger than tRCRISE for allowing
a good current regulation by the PWM stage. Furthermore, the on time tON can not be
smaller than the minimum on time tON(MIN).
Equation 4
tRCRISE = 600 · COFF
tON > tONMIN = 2.5s (typ. value)
tON > tRCRISE – tDT
Figure 12 shows the lower limit for the on time tON for having a good PWM current
regulation capacity. It has to be said that tON is always bigger than tON(MIN) because the
device imposes this condition, but it can be smaller than tRCRISE - tDT. In this last case the
device continues to work but the off time tOFF is not more constant.
So, small COFF value gives more flexibility for the applications (allows smaller on time and,
therefore, higher switching frequency), but, the smaller is the value for COFF, the more
influential will be the noises on the circuit performance.
16/32
DocID9453 Rev 2
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页数 | 30 页 | ||
下载 | [ L6227.PDF 数据手册 ] |
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