L6728H STMicroelectronics, L6728H Datasheet - Page 13

• Manufacturer Part Number: L6728H
• Description: Voltage Mode PWM Controllers Sgl Output 300 KHz DFN-10
• Manufacturer: STMicroelectronics

Specifications of L6728H

• Number Of Outputs: Single Output
• Switching Frequency: 300 KHz
• Operating Supply Voltage: 5 V to 12 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: DFN-10
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6728H
8.1
Over current threshold setting
L6728H 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
Doc ID 15725 Rev 1
st
OCSET
level over current threshold ranging from 50 mV to
) between LGATE and GND. 2
Over current protection
nd
st
level threshold
level
13/32
st