L6728ATR STMicroelectronics, L6728ATR Datasheet - Page 28

• Manufacturer Part Number: L6728ATR
• Description: IC CTLR PWM SGL HI FREQ 10VFQFPN
• Manufacturer: STMicroelectronics

Specifications of L6728ATR

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 660kHz
• Duty Cycle: 67%
• 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: 660kHz
• Topology: Buck
• Output Voltage: 0.8 V
• Output Current: 1500 mA
• Switching Frequency: 660 KHz
• Duty Cycle (max): 67 %
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Synchronous Pin: No
• 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: 497-8324-2

L6728A
12.1
12.1.1
12.1.2
Note:
12.1.3
12.1.4
Demonstration board description
Power input (V
This is the input voltage for the power conversion. The High-Side drain is connected to this
input. This voltage can range from 1.5 V to 12 V bus.
If the voltage is between 5 V and 12 V it can supply also the device (through the Vcc pin)
and in this case the R16 (0 Ω) resistor must be present.
Output (V
Different output voltage rails have been tested. For each rail a few component need to be
changed: these components are used to program the desiderate output voltage. The OCP
limit is set to ~6 A but it can be changed by replacing the resistors R18.
Table 9.
All the previous resistors are SMD 0603 package, 1/16W, 1% tolerance.
Signal input (V
Using the input voltage V
However the controller can be supplied separately from the power stage through the V
input (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:
R8, R13
Ref.
–
–
–
–
–
–
–
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.
OUT
Rail dependent components
8 V rail
)
240 Ω
IN
CC
)
)
IN
to supply the controller no power is required at this input.
5 V rail
430 Ω
3.3 V rail
680 Ω
2.5 V rail
1 kΩ
5A demonstration board
1.25 V rail
3.9 kΩ
0.8 V rail
open
CC
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