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NCP81243 Datasheet(PDF) 7 Page - ON Semiconductor

Part No. NCP81243
Description  Dual Output 3 & 2 Phase Controller
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP81243 Datasheet(HTML) 7 Page - ON Semiconductor

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NCP81243
www.onsemi.com
7
NCP81243
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
CSP1
CSN1
TSENSE
ICCMAX
DRVON
PWM1
PWM2
PWM3
PWM2A
PWM1A
ICCMAXA
VBOOT/ADDR
VBOOTA/ADDRA
IOUT
EN
SDIO
ALERT#
SCLK
VRDY
VCC
ROSC
VRMP
PH/FDm/FDa/SR
TSENSEA
VRHOT
IOUTA
Figure 6.
Table 1. QFN52 PIN LIST DESCRIPTION
Pin No.
Symbol
Description
1
IOUT
Total output current for Main Rail.
2
EN
Logic input. Logic high enables both rail output and logic low disables both rail output.
3
SDIO
Serial VID data interface
4
ALERT#
Serial VID ALERT#.
5
SCLK
Serial VID clock
6
VRDY
Open drain output. High output on this pin indicates that the Main Rail output is regulating.
7
VCC
Power for the internal control circuits. A decoupling capacitor is connected from this pin to ground.
8
ROSC
A resistor to ground on this pin will set the oscillator frequency
9
VRMP
Feed−forward input of Vin for the ramp slope compensation. The current fed into this pin is used
to control of the ramp of PWM slope
10
PH/FDm/FDa/SR
A resistor to ground on startup is used to set the phase configuration per rail of the NCP81243 as
well as the Fast slew rate
11
TSenseA
Temp Sense input for Auxiliary rail
12
VR_HOT
Open drain output. Signals an over temperature event has occurred
13
IOUTA
Total output current for the Auxiliary rail.
14
VSNA
Differential Output Voltage Sense Negative for auxiliary rail
15
VSPA
Differential Output Voltage Sense Positive for auxiliary rail
16
DIFFA
Output of the auxiliary rail differential remote sense amplifier.
17
FBA
Error amplifier voltage feedback for auxiliary rail output
18
COMPA
Output of the error amplifier and the inverting inputs of the PWM comparators for the auxiliary rail
output.
19
CSCOMPA
Output of total current sense amplifier for auxiliary rail output.
20
ILIMA
Over current shutdown threshold setting for auxiliary rail l output. Resistor to CSCOMP to set
threshold.
21
CSSUMA
Inverting input of total current sense amplifier for auxiliary rail output.
22
CSREFA
Total output current sense amplifier reference voltage input for auxiliary rail
23
CSP2A
Non−inverting input to current balance sense amplifier for phase 2 A
24
CSN2A
Inverting input to current balance sense amplifier for phase 2 A
25
CSP1A
Non−inverting input to current balance sense amplifier for phase 1 A
26
CSN1A
Inverting input to current balance sense amplifier for phase 1 A


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