参数资料
| 型号： | ISL62881DHRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 19/37页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM SGL PHASE 32TQFN |
| 标准包装： | 6,000 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 带卷 (TR) |
| 配用： | ISL62881CCPUEVAL2Z-ND - EVAL BOARD ISL62881CCPU 28QFN |
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ISL62881C, ISL62881D
V Cn ( s ) = ? ------------------------------------------ × DCR ? × I o ( s ) × A cs ( s )
C n = ---------------------------------------------------------------
R ntcnet × R sum
describe the frequency-domain relationship between
inductor total current I o (s) and C n voltage V Cn (s):
? R ntcnet ? (EQ. 7)
? R ntcnet + R sum ?
L
------------------------------------------ × DCR
R ntcnet + R sum
(EQ. 12)
R ntcnet = ----------------------------------------------------
1 + -------
A cs ( s ) = -----------------------
1 + -------------
( R ntcs + R ntc ) × R p
R ntcs + R ntc + R p
s
ω L
s
ω sns
(EQ. 8)
(EQ. 9)
i o
V o
FIGURE 14. DESIRED LOAD TRANSIENT RESPONSE
ω L = -------------
DCR
L
(EQ. 10)
WAVEFORMS
i o
ω sns = --------------------------------------------------------
R ntcnet × R sum
------------------------------------------ × C n
1 (EQ. 11)
R ntcnet + R sum
Transfer function A cs (s) always has unity gain at DC. The
inductor DCR value increases as the winding temperature
increases, giving higher reading of the inductor DC
current. The NTC R ntc values decreases as its
temperature decreases. Proper selections of R sum , R ntcs ,
R p and R ntc parameters ensure that V Cn represents the
inductor total DC current over the temperature range of
interest.
There are many sets of parameters that can properly
temperature-compensate the DCR change. Since the
NTC network and the R sum resistors form a voltage
divider, V cn is always a fraction of the inductor DCR
voltage. It is recommended to have a higher ratio of V cn
to the inductor DCR voltage, so the droop circuit has
higher signal level to work with.
A typical set of parameters that provide good
temperature compensation are: R sum = 1.82k Ω ,
R p = 11k Ω , R ntcs = 2.61k Ω and R ntc = 10k Ω
(ERT-J1VR103J). The NTC network parameters may need
to be fine tuned on actual boards. One can apply full load
DC current and record the output voltage reading
immediately; then record the output voltage reading
again when the board has reached the thermal steady
state. A good NTC network can limit the output voltage
drift to within 2mV. It is recommended to follow the
Intersil evaluation board layout and current-sensing
network parameters to minimize engineering time.
V Cn (s) also needs to represent real-time I o (s) for the
controller to achieve good transient response. Transfer
function A cs (s) has a pole ω sns and a zero ω L . One needs
to match ω L and ω sns so A cs (s) is unity gain at all
frequencies. By forcing ω L equal to ω sns and solving for
the solution, Equation 12 gives C n value.
19
V o
FIGURE 15. LOAD TRANSIENT RESPONSE WHEN C n IS
TOO SMALL
i o
V o
FIGURE 16. LOAD TRANSIENT RESPONSE WHEN C n IS
TOO LARGE
For example, given R sum = 1.82k Ω , R p = 11k Ω ,
R ntcs = 2.61k Ω , R ntc = 10k Ω , DCR = 1.3m Ω and
L = 0.56μH, Equation 12 gives C n = 0.31μF.
Assuming the compensator design is correct, Figure 14
shows the expected load transient response waveforms if
C n is correctly selected. When the load current I core has
a square change, the output voltage V core also has a
square response.
If C n value is too large or too small, V Cn (s) will not
accurately represent real-time I o (s) and will worsen the
transient response. Figure 15 shows the load transient
response when C n is too small. V core will sag excessively
upon load insertion and may create a system failure.
Figure 16 shows the transient response when C n is too
large. V core is sluggish in drooping to its final value.
There will be excessive overshoot if load insertion occurs
during this time, which may potentially hurt the CPU
reliability.
FN7596.0
March 8, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62881HRTZ | 功能描述:直流/直流开关调节器 1 PHS PWM BUCKG FOR MICROPROCESR PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62881HRTZ-T | 功能描述:直流/直流开关调节器 1 PHS PWM BUCKG FOR MICROPROCESR PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62882 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs |
| ISL62882B | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Multiphase PWM Regulator for IMVP-6.5 Mobile CPUs and GPUs |
| ISL62882BHRTZ | 功能描述:直流/直流开关调节器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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