E-L6911C STMicroelectronics, E-L6911C Datasheet - Page 8

• Manufacturer Part Number: E-L6911C
• Description: IC CTRLR 5BIT PROGR STPDN 20SOIC
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of E-L6911C

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.3 ~ 3.5 V
• Current - Output: 1.3A
• Frequency - Switching: 200kHz
• Voltage - Input: 5 ~ 12 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 20-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

L6911C
Figure 3. High Side driver peak current. Vboot-Vphase=12V (left) Vboot-Vphase=5V (right)
Figure 4. Low Side driver peak current. Vcc=12V (left) Vcc=5V (right)
Monitoring and Protections
The output voltage is monitored by means of pin 1 (VSEN). If it is not within ±12% (typ.) of the programmed
value, the powergood output is forced low.
The device provides overvoltage protection, when the output voltage reaches a value 17% (typ.) grater than the
nominal one. If the output voltage exceeds this threshold, the OVP pin is forced high, triggering an external SCR
to shuts the supply (VIN) down, and also the lower driver is turned on as long as the over-voltage is detected.
To perform the overcurrent protection the device compares the drop across the high side MOS, due to the
RDSON, with the voltage across the external resistor (ROCS) connected between the OCSET pin and drain of
the upper MOS. Thus the overcurrent threshold (I
Where the typical value of I
R
8/20
DSON
(also the variation with temperature) and the minimum value of I
OCS
CH1 = High Side Gate
CH1 = Low Side Gate
is 200 A. To calculate the ROCS value it must be considered the maximum
I
P
=
P
) can be calculated with the following relationship:
I
-------------------------------- -
OCS
R
DSON
CH4 = Gate Current
CH4 = Gate Current
R
OCS
OCS
. To avoid undesirable trigger of