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| 型号： | ISL6316CRZ-T |
| 厂商： | Intersil |
| 文件页数： | 22/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 4,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 66.7% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL6316
When the TM NTC is placed close to the current sense
component (inductor or MOSFET), the temperature of the
5. Use the following equation to calculate the TCOMP factor
N:
209x ( T CSC – T
N = -------------------------------------------------------- + 4
NTC will track the temperature of the current sense
component. Therefore the TM voltage can be utilized to obtain
the temperature of the current sense component.
NTC
3xT NTC + 400
)
(EQ. 20)
Based on VCC voltage, ISL6316 converts the TM pin voltage
to a 6-bit TM digital signal for temperature compensation. With
the non-linear A/D converter of ISL6316, TM digital signal is
linearly proportional to the NTC temperature. For accurate
temperature compensation, the ratio of the TM voltage to the
NTC temperature of the practical design should be similar to
6. Choose an integral number close to the above result for
the TCOMP factor. If this factor is higher than 15, use
N = 15. If it is less than 1, use N = 1.
7. Choose the pull-up resistor R TC1 (typical 10k Ω ).
8. If N = 15, do not need the pull-down resistor R TC2 ,
otherwise obtain R TC2 by the following equation:
R TC2 = -----------------------
that in Figure 15.
Depending on the location of the NTC and the airflow, the
NxR TC1
15 – N
(EQ. 21)
NTC may be cooler or hotter than the current sense
component. TCOMP pin voltage can be utilized to correct the
temperature difference between NTC and the current sense
component. When a different NTC type or different voltage
divider is used for the TM function, TCOMP voltage can also
be used to compensate for the difference between the
recommended TM voltage curve in Figure 16 and that of the
actual design. According to the VCC voltage, ISL6316
converts the TCOMP pin voltage to a 4-bit TCOMP digital
signal as TCOMP factor N.
TCOMP factor N is an integer between 0 and 15. The
integrated temperature compensation function is disabled for
N = 0. For N = 4, the NTC temperature is equal to the
temperature of the current sense component. For N < 4, the
NTC is hotter than the current sense component. The NTC is
cooler than the current sense component for N > 4. When
N > 4, the larger TCOMP factor N, the larger the difference
between the NTC temperature and the temperature of the
current sense component.
ISL6316 multiplexes the TCOMP factor N with the TM digital
signal to obtain the adjustment gain to compensate the
temperature impact on the sensed channel current. The
compensated channel current signal is used for droop and
overcurrent protection functions.
Design Procedure:
1. Properly choose the voltage divider for TM pin to match
the TM voltage Vs temperature curve with the
recommended curve in Figure 15.
2. Run the actual board under the full load and the desired
cooling condition.
3. After the board reaches the thermal steady state, record
the temperature (T CSC ) of the current sense component
(inductor or MOSFET) and the voltage at TM and VCC
pins.
4. Use the following equation to calculate the resistance of
the TM NTC, and find out the corresponding NTC
temperature T NTC from the NTC datasheet.
9. Run the actual board under full load again with the proper
resistors connected to the TCOMP pin.
10. Record the output voltage as V1 immediately after the
output voltage is stable with the full load; Record the
output voltage as V2 after the VR reaches the thermal
steady state.
11. If the output voltage increases over 2mV as the
temperature increases, i.e. V2 - V1 > 2mV, reduce N and
redesign R TC2 ; if the output voltage decreases over 2mV
as the temperature increases, i.e. V1 - V2 > 2mV,
increase N and redesign R TC2 .
The design spreadsheet is available for those calculations.
External Temperature Compensation
By setting the voltage of TCOMP pin to 0, the integrated
temperature compensation function is disabled. One external
temperature compensation network, shown in Figure 18, can
be used to cancel the temperature impact on the droop (i.e.
load line).
COMP
FB
IDROOP
o c
VDIFF
FIGURE 18. VOLTAGE AT IDROOP PIN WITH A RESISTOR
PLACED FROM IDROOP PIN TO GND WHEN
LOAD CURRENT CHANGES
The sensed current will flow out of IDROOP pin and develop
the droop voltage across the equivalent resistor (R FB )
) = --------------------------------
R NTC ( T
NTC
V TM xR TM1
V CC – V TM
(EQ. 19)
between FB and VDIFF pins. If RFB resistance reduces as
the temperature increases, the temperature impact on the
droop can be compensated. An NTC resistor can be placed
22
FN9227.1
December 12, 2006
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