Datasheet

L6206
8/23
CIRCUIT DESCRIPTION
POWER STAGES and CHARGE PUMP
The L6206 integrates two independent Power MOS
Full Bridges. Each Power MOS has an Rd-
son=0.3ohm (typical value @ 25°C), with intrinsic
fast freewheeling diode. Cross conduction protection
is achieved using a dead time (td = 1
µ s typical) be-
tween the switch off and switch on of two Power MOS
in one leg of a bridge.
Using N Channel Power MOS for the upper transis-
tors in the bridge requires a gate drive voltage above
the power supply voltage. The Bootstrapped (Vboot)
supply is obtained through an internal Oscillator and
few external components to realize a charge pump
circuit as shown in Figure 3. The oscillator output
(VCP) is a square wave at 600kHz (typical) with 10V
amplitude. Recommended values/part numbers for
the charge pump circuit are shown in Table1.
Table 1. Charge Pump External Components
Values
Figure 3. Charge Pump Circuit
LOGIC INPUTS
Pins IN1
A
, IN2
A
, IN1
B
, IN2
B
, EN
A
and EN
B
are TTL/
CMOS and uC compatible logic inputs. The internal
structure is shown in Fig. 4. Typical value for turn-on
and turn-off thresholds are respectively Vthon=1.8V
and Vthoff = 1.3V.
Pins EN
A
and EN
B
are commonly used to implement
Overcurrent and Thermal protection by connecting
them respectively to the outputs OCD
A
and OCD
B
,
which are open-drain outputs. If that type of connec-
tion is chosen, some care needs to be taken in driving
these pins. Two configurations are shown in Fig. 5
and Fig. 6. If driven by an open drain (collector) struc-
ture, a pull-up resistor R
EN
and a capacitor C
EN
are
connected as shown in Fig. 5. If the driver is a stan-
dard Push-Pull structure the resistor R
EN
and the ca-
pacitor C
EN
are connected as shown in Fig. 6. The
resistor R
EN
should be chosen in the range from
2.2k
Ω to 180K Ω . Recommended values for R
EN
and
C
EN
are respectively 100K Ω and 5.6nF. More infor-
mation on selecting the values is found in the Over-
current Protection section.
Figure 4. Logic Inputs Internal Structure
Figure 5. EN
A
and EN
B
Pins Open Collector
Driving
Figure 6. EN
A
and EN
B
Pins Push-Pull Driving
TRUTH TABLE
X = Don't care
High Z = High Impedance Output
C
BOOT
220nF
C
P
10nF
R
P
100Ω
D1 1N4148
D2 1N4148
D2
C
BOOT
D1
R
P
C
P
V
S
VS
A
VCP VBOOT VS
B
D01IN1328
INPUTS OUTPUTS
EN IN1 IN2 OUT1 OUT2
L X X High Z High Z
H L L GND GND
H H L Vs GND
HLHGNDVs
HHHVsVs
5V
D01IN1329
ESD
PROTECTION
5V
5V
OPEN
COLLECTOR
OUTPUT
R
EN
C
EN
EN
A
or EN
B
OCD
A
or OCD
B
D02IN135
5
5V
PUSH-PULL
OUTPUT
R
EN
C
EN
EN
A
or EN
B
D02IN135
6
OCD
A
or OCD
B