L6460 STMicroelectronics, L6460 Datasheet - Page 76

• Manufacturer Part Number: L6460
• Description: MOSFET & Power Driver ICs SPI Config Stepper DC Multi Motor DRV
• Manufacturer: STMicroelectronics
• Type: Full-Bridge Driverr

Specifications of L6460

• Product: Half-Bridge Drivers
• Rise Time: 0.4 us
• Fall Time: 0.4 us
• Supply Voltage (max): 38 V
• Supply Voltage (min): 13 V
• Supply Current: 11 mA
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 4
• Output Current: 10 mA
• Output Voltage: 30 V
• Package / Case: TQFP-64
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power bridges
14.1.8
76/139
Battery charger or switching regulator (Bridge 4)
The functionality of this circuit is obtained by using the bridge 4 output stage. This circuit is
powered directly from
switching regulator.
The control loop block diagram is shown in the
Figure 21. Battery charger control loop block diagram
The battery charger control loop implements an asynchronous switching regulator intended
to be used as a constant voltage/constant current programmable source.
When used as a simple switching regulator, it could be a system regulator depending on
startup configurations
When a system regulator under-voltage event is detected L6460 will enter in reset state
signaling this event to the microcontroller by pulling low the nRESET pin and disabling most
of its internal blocks.
When the control loop is intended to be used as a battery charger, the Aux3BatteryCharge
bit must be written in the Aux3SwCfg1 register. This is because in this case the
undervoltage event that will be sure present when charging a battery (see battery charger
profile in
The regulated output voltage will be externally set by a resistor divider network connected to
V
consequence, four under-voltage thresholds) using the serial interface. The feedback
reference voltage selection is made by writing the SelFBRef[1:0] bits in the Aux3SwCfg1
register.
The regulation of the output current can be done externally, by using a sense resistor
connected in series on the path that provides current to the load. By using an external
differential amplifier the customer can set the desired V = f(I) characteristic, and therefore
REF_FB
PULSE SKIPPING
BURST
CONTROL LOGIC
PEAK CURRENT
MODE CONTROL
LOGIC
L6460
pin. L6460 has the possibility to choose between four voltage references (and, as a
Figure
22) will not be considered during start up sequence.
PWM
Ilimit
V
Supply
SelCurrRef<1:0>
SelFBRef<1:0>
PARALLELED
BRIDGE 4
POWER
STAGE
and it is intended to be used as a battery charger or a
COMP_I
COMP_V
Doc ID 17713 Rev 1
FBRef
CurrRef
DC4_plus
DC4_minus
VREF_FB
IREF_FB
Figure
21.
AMPLI
DIFF
LOAD
L6460
TO