L6728TR STMicroelectronics, L6728TR Datasheet - Page 28

• Manufacturer Part Number: L6728TR
• Description: IC PWM CTLR 1PH PWRGOOD 10DFN
• Manufacturer: STMicroelectronics

Specifications of L6728TR

• 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
• Other names: 497-6274-2

5 A demonstration board
13.1.2
13.1.3
13.1.4
13.1.5
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If the voltage is between 4.5 V and 12 V it can supply also the device (through the Vcc pin)
and in this case the R16 (0Ω) resistor must be present.
Output (Vout)
The output voltage is fixed at 1.25 V but it can be changed by replacing the resistors R8
(sense partition lower resistor) and R13 (feedback partition lower resistor). R18 allows to
adjust OCP threshold.
Signal input (Vcc)
Using the input voltage Vin to supply the controller no power is required at this input.
However the controller can be supplied separately from the power stage through the Vcc
input (4.5-12 V) and, in this case, the R16 (0 Ω) resistor must be unsoldered.
Test points
Several test points are provided to have easy access at all important signal characterizing
the device:
Board characterization
Figure 18. 5 A demonstration board efficiency
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COMP: the output of the error amplifier;
FB: the inverting input of the error amplifier;
PGOOD: signaling the regular functioning (active high);
VGDHS: the bootstrap diode anode;
PHASE: Phase node;
LGATE: Low-side gate pin of the device;
HGATE: High-side gate pin of the device.
L6728