参数资料
| 型号： | ISL62883IRTZ |
| 厂商： | Intersil |
| 文件页数： | 26/37页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM 3PHASE BUCK 40TQFN |
| 标准包装： | 60 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 5 V ~ 21 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 管件 |
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ISL62883, ISL62883B
Figure 26 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 threshold voltage of 1.20V and the
comparator output is low. VR_TT# is pulled up by the external
resistor.
When temperature increases, the NTC thermistor resistance
represent the DC current flowing through the inductors.
Recommended values are R s = 10k Ω and C s = 0.22μF.
Layout Guidelines
Table 5 shows the layout considerations. The designators refer to
the reference design shown in Figure 27.
TABLE 5. LAYOUT CONSIDERATION
--------------- – --------------- = 2.96k
1.24V 1.20V
54 μ A
60 μ A
decreases so the NTC pin voltage drops. When the NTC pin
voltage drops below 1.20V, the comparator changes polarity and
turns SW1 off and throws SW2 to 1.24V. This pulls VR_TT# low
and sends the signal to start thermal throttle. There is a 6μA
current reduction on NTC pin and 40mV voltage increase on
threshold voltage of the comparator in this state. The VR_TT#
signal will be used to change the CPU operation and decrease
the power consumption. When the temperature drops down, the
NTC thermistor voltage will go up. If NTC voltage increases to
above 1.24V, the comparator will flip back. The external
resistance difference in these two conditions is expressed in
Equation 49:
(EQ. 49)
One needs to properly select the NTC thermistor value such that
the required temperature hysteresis correlates to 2.96k Ω
resistance change. A regular resistor may need to be in series
with the NTC thermistor to meet the threshold voltage values.
For example, given Panasonic NTC thermistor with B = 4700, the
resistance will drop to 0.03322 of its nominal at +105°C, and
drop to 0.03956 of its nominal at +100°C. If the required
temperature hysteresis is +105°C to +100°C, the required
PIN
EP
1
2
3
4
5
6
7
8
NAME
GND
PGOOD
PSI#
RBIAS
VR_TT#
NTC
VW
COMP
FB
LAYOUT CONSIDERATION
Create analog ground plane underneath the
controller and the analog signal processing
components. Don’t let the power ground plane
overlap with the analog ground plane. Avoid noisy
planes/traces (e.g.: phase node) from crossing
over/overlapping with the analog plane.
No special consideration
No special consideration
Place the Rbias resistor (R16) in general proximity
of the controller. Low impedance connection to the
analog ground plane.
No special consideration
The NTC thermistor (R9) needs to be placed close
to the thermal source that is monitor to determine
thermal throttling. Usually it’s placed close to
Phase-1 high-side MOSFET.
Place the capacitor (C4) across VW and COMP in
close proximity of the controller
Place the compensator components (C3, C6 R7,
R11, R10 and C11) in general proximity of the
controller.
------------------------------------------------------- = 467k Ω
resistance of NTC will be:
2.96k Ω
( 0.03956 – 0.03322 )
(EQ. 50)
9
ISEN3/FB2 A capacitor (C7) decouples it to VSUM-. Place it in
general proximity of the controller.
An optional capacitor is placed between this pin
Therefore a larger value thermistor, such as 470k NTC should be
used.
and COMP. (It’s only used when the controller is
configured 2-phase). Place it in general proximity
of the controller.
--------------- – 15.6k Ω = 4.4k Ω
1.20V
At +105°C, 470k Ω NTC resistance becomes
(0.03322 × 470k Ω ) = 15.6k Ω . With 60μA on the NTC pin, the
voltage is only (15.6k Ω× 60μA) = 0.937V. This value is much
lower than the threshold voltage of 1.20V. Therefore, a regular
resistor needs to be in series with the NTC. The required
resistance can be calculated by Equation 51:
(EQ. 51)
60 μ A
10
11
12
13
ISEN2
ISEN1
VSEN
RTN
A capacitor (C9) decouples it to VSUM-. Place it in
general proximity of the controller.
A capacitor (C10) decouples it to VSUM-. Place it in
general proximity of the controller.
Place the VSEN/RTN filter (C12, C13) in close
proximity of the controller for good decoupling.
4.42k is a standard resistor value. Therefore, the NTC branch
should have a 470k NTC and 4.42k resistor in series. The part
number for the NTC thermistor is ERTJ0EV474J. It is a 0402
package. The NTC thermistor will be placed in the hot spot of the
board.
Current Balancing
Refer to Figures 1 and 2. The ISL62883 achieves current
balancing through matching the ISEN pin voltages. R s and C s
form filters to remove the switching ripple of the phase node
voltages. It is recommended to use rather long R s C s time
constant such that the ISEN voltages have minimal ripple and
26
FN6891.4
June 21, 2011
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相关代理商/技术参数 |
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| ISL62883IRTZ-T | 功能描述:直流/直流开关调节器 3 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 |
| ISL62884C | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single-Phase PWM Regulator for IMVP-6a?￠ Mobile CPUs |
| ISL62884CEVAL2Z | 功能描述:EVAL BOARD FOR ISL62884C RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL62884CHRTZ | 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 |
| ISL62884CHRTZ-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 |
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