L6728DTR STMicroelectronics, L6728DTR Datasheet - Page 19

• Manufacturer Part Number: L6728DTR
• Description: IC PWM CTLR 1PH POWERGOOD 10DFN
• Manufacturer: STMicroelectronics

Specifications of L6728DTR

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 330kHz
• Duty Cycle: 80%
• Voltage - Supply: 5 V ~ 12 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 10-DFN
• Frequency-max: 330kHz
• Duty Cycle (max): 80 %
• Mounting Style: SMD/SMT
• Switching Frequency: 300 KHz
• Operating Supply Voltage: 5 V to 12 V
• Supply Current: 6 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-10432-2

L6728D
Figure 7.
Gate traces and phase traces must be sized according to the driver RMS current delivered
to the power MOSFET. The device robustness allows the management of applications with
the power section far from the controller without compromising performance. In any case,
when possible it is recommended to minimize the distance between the controller and
power section.
Small signal components and connections to critical nodes of the application, as well as
bypass capacitors for the device supply, are also important. Locate bypass capacitor (VCC
and bootstrap capacitor) and feedback compensation components as close to the device as
practical. For overcurrent programmability, place R
leakage current paths on the LGATE / OC pin, since internal current source is only 10 µA.
Systems that do not use a Schottky diode in parallel to the low-side MOSFET might show
big negative spikes on the phase pin. This spike must be limited within the absolute
maximum ratings (for example, adding a gate resistor in series to the HS MOSFET gate), as
well as the positive spike, but has an additional consequence: it causes the bootstrap
capacitor to be over-charged. This extra charge can cause, in the worst-case condition of
maximum input voltage and during particular transients, that boot-to-phase voltage
overcomes the absolute maximum ratings, also causing device failures. It is then suggested
in this cases to limit this extra charge by adding a small resistor in series to the bootstrap
diode.
Figure 8.
LS DRIVER
LGATE
GND
VCC
Power connections (heavy lines)
Driver turn-on and turn-off paths
L6728A
L6728D
R
UGATE
GATE
PHASE
LGATE
GND
LS MOSFET
R
INT
C
GS
C
GD
Doc ID 16498 Rev 1
C
DS
C
V
IN
IN
L
OCSET
HS DRIVER
C
OUT
close to the device and avoid
PHASE
BOOT
UGATE
LOAD
R
GATE
Application details
HS MOSFET
R
INT
C
GS
C
GD
19/33
C
DS