Read Sharp LC-42XD1E (serv.man6) Service Manual online
LC-42XD1E/RU
5 – 15
9. IC1712: VHiMP1410ES-1Y
Step Down Converter.
10. IC1706: VHiMP1583++-1Y
Step Down Converter
Pin No.
Pin Name
I/O
Pin Function
1
BS
I
High-Side Gate Drive Boost input.
BS supplies the drive for the high-side n-channel MOSFET switch.
Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.
BS supplies the drive for the high-side n-channel MOSFET switch.
Connect a 10nF or greater capacitor from SW to BS to power the high-side switch.
2
IN
I
Power input.
IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 15V power source.
Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See input Capacitor.
IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 15V power source.
Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See input Capacitor.
3
SW
O
Power Switching Output.
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.
4
GND
—
Ground.
5
FB
I
Feedback input.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage.
The feedback threshold is 1.22V.
See Setting the Output Voltage.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage.
The feedback threshold is 1.22V.
See Setting the Output Voltage.
6
COMP
—
Compensation Node.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
See Compensation.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
See Compensation.
7
EN
I
Enable input.
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator, drive it low to turn it off.
For automatic startup, leave EN unconnected.
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator, drive it low to turn it off.
For automatic startup, leave EN unconnected.
8
N/C
—
No Connect.
Pin No.
Pin Name
I/O
Pin Function
1
BS
I
High-Side Gate Drive Boost Input.
BS supplies the drive for the high-side n-channel MOSFET Switch.
Connect a 4.7nF or greater capacitor from SW to BS to power the high side switch.
BS supplies the drive for the high-side n-channel MOSFET Switch.
Connect a 4.7nF or greater capacitor from SW to BS to power the high side switch.
2
IN
I
Power input.
IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 23V power source.
Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.
IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 23V power source.
Bypass IN to GND with a suitably large capacitor to eliminate noise on the input to the IC.
See Input Capacitor.
3
SW
O
Power Switching Output.
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.
SW is the switching node that supplies power to the output.
Connect the output LC filter from SW to the output load.
Note that a capacitor is required from SW to BS to power the high-side switch.
4
GND
—
Ground. (Note: Connect the exposed pad on backside to Pin4).
5
FB
I
Feedback input.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage.
The feedback threshold is 1.222V.
See Setting the Output Voltage.
FB senses the output voltage to regulate that voltage.
Drive FB with a resistive voltage divider from the output voltage.
The feedback threshold is 1.222V.
See Setting the Output Voltage.
6
COMP
I
Compensation Node.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
In same cases, an additional capacitor from COMP to GND is required.
See Compensation.
COMP is used to compensate the regulation control loop.
Connect a series RC network from COMP to GND to compensate the regulation control loop.
In same cases, an additional capacitor from COMP to GND is required.
See Compensation.
7
EN
I
Enable input
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator, drive it low to turn it off.
For automatic startup, leave EN unconnected.
EN is a digital input that turns the regulator on or off.
Drive EN high to turn on the regulator, drive it low to turn it off.
For automatic startup, leave EN unconnected.
8
SS
I
Soft Start Control input.
SS controls the soft start period.
Connect a capacitor from SS to GND to set the soft-start period.
A 0.1
SS controls the soft start period.
Connect a capacitor from SS to GND to set the soft-start period.
A 0.1
µF capacitor sets the soft-start period to l0ms
To disable the soft-start feature CIeave SS unconnected.
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