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ISL6336B Datasheet(PDF) 23 Page - Renesas Technology Corp

Part No. ISL6336B
Description  6-Phase PWM Controller with Light Load Efficiency Enhancement and Current Monitoring
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL6336B Datasheet(HTML) 23 Page - Renesas Technology Corp

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ISL6336B
FN6696 Rev 3.00
Page 23 of 32
May 5, 2016
Based on the NTC temperature characteristics and the
desired threshold of VR_HOT signal, the pull-up resistor
RTM1 of TM pin is given by Equation 20:
RNTC(t3) is the NTC resistance at the VR_HOT threshold
temperature t3.
The NTC resistance at the set point T2 signal can be
calculated as:
With the NTC resistance value obtained from Equations 21
and 22, the temperature value t2 and t1 can be found from
the NTC datasheet.
Temperature Compensation
ISL6336B supports inductor DCR sensing, or resistive
sensing techniques. The inductor DCR has a positive
temperature coefficient of about +0.385%/°C. Because the
voltage across inductor is sensed for output current
information, the sensed current has the same positive
temperature coefficient as the inductor DCR.
In order to obtain the correct current information, there
should be a way to correct the temperature impact on the
current sense component. The ISL6336B provides two
methods: integrated temperature compensation and external
temperature compensation.
Integrated Temperature Compensation
When the TCOMP voltage is equal to or greater than VCC/15,
ISL6336B will utilize the voltage at the TM and TCOMP pins to
compensate the temperature impact on the sensed current.
The block diagram of this function is shown in Figure 17.
When the TM NTC is placed close to the current sense
component (inductor), the temperature of the NTC will track
the temperature of the current sense component. Therefore,
the TM voltage can be utilized to obtain temperature of the
current sense component.
0.333V
CC
oC
R
TM1
R
NTC
VCC
TM
VR_HOT
FIGURE 14. BLOCK DIAGRAM OF THERMAL MONITORING
FUNCTION
FIGURE 15. THE RATIO OF TM VOLTAGE TO NTC
TEMPERATURE WITH RECOMMENDED PARTS
20
30
40
50
60
70
80
90
100
0
2040
6080
100
120
140
TEMPERATURE (°C)
TM
VR_FAN
VR_HOT
0.333*VCC
TEMPERATURE
t2
t3
0.391*VCC
FIGURE 16. VR_HOT SIGNAL vs TM VOLTAGE
RTM1
2.75xRNTC t3

=
(EQ. 20)
RNTC t2

1.267xRNTC t3

=
(EQ. 21)
RNTC t1

1.644xRNTC t3

=
(EQ. 22)
oc
R
TM1
R
NTC
TM
R
TC1
R
TC2
TCOMP
V
CC
NON-LINEAR
A/D
4-BIT
A/D
DROOP IOUT AND
OVERCURRENT
PROTECTION
I
3
I
4
I
5
I
6
k
i
D/A
CHANNEL
CURRENT
SENSE
I
Sen6
I
Sen5
I
Sen4
I
Sen3
V
CC
I
Sen2
I
Sen1
I
2
I
1
FIGURE 17. BLOCK DIAGRAM OF INTEGRATED
TEMPERATURE COMPENSATION


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