L6728D STMicroelectronics, L6728D Datasheet - Page 14

• Manufacturer Part Number: L6728D
• Description: IC CTLR PWM 1PH POWERGOOD 10DFN
• Manufacturer: STMicroelectronics

Specifications of L6728D

• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Overcurrent protection
8.1
14/33
Overcurrent threshold setting
The L6728D allows easy programming of a 1
mV to 550 mV, simply by adding a resistor (R
level threshold is automatically set accordingly.
During a short period of time (about 5 ms) following VCC rising over UVLO threshold, an
internal 10 µA current (I
across R
overcurrent threshold. The OC setting procedure’s overall time period is about 5 ms.
Connecting an R
threshold is:
the programmed 2
R
In case R
values: an internal safety clamp on LGATE is triggered as soon as the LGATE voltage
reaches 600 mV, setting the maximum threshold and suddenly ending the OC setting phase.
I
I
OCth1
OCth2
OCSET
values range from 5 kΩ to 55 kΩ.
=
=
OCSET
OCSET
1.5
I
------------------------------------------- -
OCSET
. This voltage drop is sampled and internally held by the device as a 1
⋅
is not connected, the device sets the OCP thresholds to the maximum
OCSET
I
------------------------------------------- -
R
nd
OCSET
dsON
⋅
level threshold is:
R
OCSET
resistor between LGATE and GND, the programmed 1
R
OCSET
dsON
⋅
R
) is sourced from the LGATE pin, determining a voltage drop
OCSET
Doc ID 16498 Rev 1
st
OCSET
level overcurrent threshold ranging from 50
) between LGATE and GND. The 2
st
level
L6728D
st
nd
level