L6728 STMicroelectronics, L6728 Datasheet - Page 13

• Manufacturer Part Number: L6728
• Description: IC PWM CTLR 1PH PWRGOOD 10-DFN
• Manufacturer: STMicroelectronics

Specifications of L6728

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 330kHz
• Duty Cycle: 80%
• Voltage - Supply: 4.5 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
• Output Voltage: 0.8 V
• Output Current: 30 A
• Input Voltage: 1.5 V to 13.2 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• For Use With: 497-8228 - BOARD EVALUATION W/L6728497-6418 - BOARD EVAL BASED ON L6728
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6728
8.1
Over current threshold setting
L6728 allows to easily program a 1
550 mV, simply by adding a resistor (R
will be 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
level over current threshold. The OC setting procedure overall time length is about 5 ms.
Connecting a R
threshold will be:
the programmed 2
R
In case R
values: an internal safety clamp on LGATE is triggered as soon as LGATE voltage reaches
600 mV, setting the maximum threshold and suddenly ending OC setting phase.
I
I
OCth1
OCth2
OCSET
values range from 5 kΩ to 55 kΩ.
=
=
OCSET
OCSET
I
------------------------------------------- -
1.5
OCSET
. This voltage drop will be sampled and internally held by the device as 1
OCSET
⋅
is not connected, the device sets the OCP thresholds to the maximum
I
------------------------------------------- -
R
nd
OCSET
dsON
⋅
level threshold will be:
R
resistor between LGATE and GND, the programmed 1
OCSET
R
OCSET
dsON
⋅
R
) is sourced from LGATE pin, determining a voltage drop
OCSET
st
level over current threshold ranging from 50 mV to
OCSET
) between LGATE and GND. 2
Over current protection
nd
st
level threshold
level
13/31
st