参数资料
| 型号： | ISL62881CHRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 24/37页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM SGL PHASE 28TQFN |
| 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： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 配用： | ISL62881CCPUEVAL2Z-ND - EVAL BOARD ISL62881CCPU 28QFN |
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ISL62881C, ISL62881D
Optional Slew Rate Compensation Circuit for
1-Tick VID Transition
When V core increases, the time domain expression of the
?
--------------------------- ?
I droop ( t ) = -------------------------- × ------------------- × ? 1 – e out
R droop
FB
Rdroop
R vid C vid
I vid
Vcore
OPTIONAL
– t
C out × LL dV core C × LL ? (EQ. 31)
dt ? ?
? ?
where C out is the total output capacitance.
In the meantime, the R vid -C vid branch current I vid time
domain expression is as shown in Equation 32:
Σ VDAC DAC
?
-------------------------------- ?
dV fb
× C vid ?
I vid ( t ) = C vid × ------------ × ? 1 – e vid
dV fb C out × LL dV core
C vid × ------------ = -------------------------- × -------------------
R droop
COMP
E/A
INTERNAL TO
IC
Idroop_vid
X1
VIDs
RTN
VSS
VID<0:6>
VSS SENSE
– t
R (EQ. 32)
dt ? ?
? ?
It is desired to let I vid (t) cancel I droop_vid (t). So there
are :
(EQ. 33)
dt dt
and :
dV core
C out × LL
C vid = -------------------------- × -------------------
R droop dV fb
VID<0:6>
Vfb
Ivid
Vcore
R vid × C vid = C out × LL
The result is:
R vid = R droop
and :
-------------------
dt
------------
dt
(EQ. 34)
(EQ. 35)
(EQ. 36)
Idroop_vid
FIGURE 24. OPTIONAL SLEW RATE COMPENSATION
CIRCUIT FOR1-TICK VID TRANSITION
During a large VID transition, the DAC steps through the
VIDs at a controlled slew rate of 2.5μs or 1.25μs per tick
(12.5mV), controlling output voltage V core slew rate at
5mV/μs or 10mV/μs.
Figure 24 shows the waveforms of 1-tick VID transition.
During 1-tick VID transition, the DAC output changes at
approximately 15mV/μs slew rate, but the DAC cannot
step through multiple VIDs to control the slew rate.
Instead, the control loop response speed determines
V core slew rate. Ideally, V core will follow the FB pin
voltage slew rate. However, the controller senses the
inductor current increase during the up transition, as the
I droop_vid waveform shows, and will droop the output
voltage V core accordingly, making V core slew rate slow.
Similar behavior occurs during the down transition.
To control V core slew rate during 1-tick VID transition,
one can add the R vid -C vid branch, whose current I vid
cancels I droop_vid .
24
For example: given LL = 7m Ω , R droop = 3.08k Ω ,
C out = 500μF, dV core /dt = 10mV/μs and
dV fb /dt = 15mV/μs, Equation 35 gives R vid = 3.08k Ω
and Equation 36 gives C vid = 757pF.
It’s recommended to select the calculated R vid value and
start with the calculated C vid value and tweak it on the
actual board to get the best performance.
During normal transient response, the FB pin voltage is
held constant, therefore is virtual ground in small signal
sense. The R vid -C vid network is between the virtual
ground and the real ground, and hence has no effect on
transient response.
Voltage Regulator Thermal Throttling
Figure 25 shows the thermal throttling feature with
hysteresis. An NTC network is connected between the
NTC pin and GND. At low temperature, SW1 is on and
SW2 connects to the 1.20V side. The total current
flowing out of the NTC pin is 60μA. The voltage on NTC
pin is higher than the threshold voltage of 1.20V and the
comparator output is low. VR_TT# is pulled up by the
external resistor.
FN7596.0
March 8, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62881CIRTZ | 功能描述:直流/直流开关调节器 1-PHS PWM BUCKG FOR MICROPROC PWR SUPPLY 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 |
| ISL62881CIRTZ-T | 功能描述:直流/直流开关调节器 1-PHS PWM BUCKG FOR MICROPROC PWR SUPPLY 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 |
| ISL62881D | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single-Phase PWM Regulator for IMVP-6.5a?￠ Mobile CPUs and GPUs |
| ISL62881DHRTZ | 功能描述:直流/直流开关调节器 1 PHS CNTRLR W/INTEG DRVR 32LD 5X5 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 |
| ISL62881DHRTZ-T | 功能描述:直流/直流开关调节器 1 PHS CNTRLR W/INTEG DRVR 32LD 5X5 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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