参数资料
| 型号： | ISL62882BHRTZ-T |
| 厂商： | Intersil |
| 文件页数： | 18/42页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM 2PHASE BUCK 48TQFN |
| 标准包装： | 4,000 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 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： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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ISL62882, ISL62882B
CCM Switching Frequency
The R fset resistor between the COMP and the VW pins sets the
VW windows size, therefore sets the switching frequency. When
the ISL62882 is in continuous conduction mode (CCM), the
switching frequency is not absolutely constant due to the nature
increase during load insertion and will decrease during load
release to achieve fast response. On the other hand, the
switching frequency is relatively constant at steady state.
Variation is expected when the power stage condition, such as
input voltage, output voltage, load, etc. changes. The variation is
usually less than 15% and doesn’t have any significant effect on
output voltage ripple magnitude. Equation 12 gives an estimate
of the frequency-setting resistor R fset value. 8k Ω R fset gives
approximately 300kHz switching frequency. Lower resistance
gives higher switching frequency.
If ISEN2 is tied to 5V, the ISL62882 is configured for 1-phase
operation. Rbias = 147k Ω sets 1-phase CPU VR configuration
and Rbias = 47k Ω sets 1-phase GPU configuration.
Table 3 shows the ISL62882 operational modes, programmed by
the logic status of the PSI# and DPRSLPVR pins.
In 2-phase configuration, the ISL62882 enters 1-phase CCM for
(PSI# = 0 and DPRSLPVR = 0). It drops phase 2 and reduces the
overcurrent and the way-overcurrent protection levels to 1/2 of
the initial values. The ISL62882 enters 1-phase DE mode when
DPRSLPVR = 1 by dropping phase 2.
In 1-phase configuration, the ISL62882 does not change the
operational mode when the PSI# signal changes status. It enters
1-phase DE mode when DLPRSLPVR = 1.
Dynamic Operation
When the ISL62882 is configured for CPU VR application, it
R fset ( k Ω ) = ( Period ( μ s ) – 0.29 ) × 2.65
Modes of Operation
TABLE 2. ISL62882 CONFIGURATIONS
(EQ. 12)
responds to VID changes by slewing to the new voltage at
5mV/μs slew rate. As the output approaches the VID command
voltage, the dv/dt moderates to prevent overshoot. Geyserville-III
transitions commands one LSB VID step (12.5mV) every 2.5μs,
controlling the effective dv/dt at 5mv/μs. The ISL62882 is
capable of 5mV/μs slew rate.
ISEN2
Connected to the
Power Stage
Tied to 5V
Rbias
(k Ω)
147
47
147
47
CONFIGURATION
2-phase CPU VR
1-phase CPU VR
1-phase GPU VR
OVERSHOOT
REDUCTION
FUNCTION
Disabled
Enabled
See Table 4
When the ISL62882 is configured for GPU VR application, it
responds to VID changes by slewing to the new voltage at a slew
rate set by the logic status on the DPRSLPVR pin. The slew rate is
5mV/μs when DPRSLPVR = 0 and is doubled when
DPRSLPVR = 1.
When the ISL62882 is in DE mode, it will actively drive the output
voltage up when the VID changes to a higher value. It’ll resume
DE mode operation after reaching the new voltage level. If the
TABLE 3. ISL62882 MODES OF OPERATION
load is light enough to warrant DCM, it will enter DCM after the
inductor current has crossed zero for four consecutive cycles. The
CONFIG.
2-phase CPU
Configuration
1-phase CPU
Configuration
1-phase GPU
Configuration
PSI#
0
0
1
1
x
x
DPRSLPVR
0
1
0
1
0
1
0
1
OPERATIONAL
MODE
1-phase CCM
1-phase DE
2-phase CCM
1-phase DE
1-phase CCM
1-phase DE
1-phase CCM
1-phase DE
VOLTAGE
SLEW
RATE
5mV/μs
10mV/μs
ISL62882 will remain in DE mode when the VID changes to a
lower value. The output voltage will decay to the new value and
the load will determine the slew rate. Over-voltage protection is
blanked during VID down transition in DE mode until the output
voltage is within 60mV of the VID value.
During load insertion response, the Fast Clock function increases
the PWM pulse response speed. The ISL62882 monitors the
VSEN pin voltage and compares it to 100ns-filtered version.
When the unfiltered version is 20mV below the filtered version,
the controller knows there is a fast voltage dip due to load
insertion, hence issues an additional master clock signal to
deliver a PWM pulse immediately.
The R 3 ? modulator intrinsically has voltage feed-forward. The
output voltage is insensitive to a fast slew rate input voltage
change.
The ISL62882 can be configured for 2- or 1-phase operation.
For 1-phase configuration, tie the ISEN2 pin to 5V. In this
configuration, only phase-1 is active.
Table 2 shows the ISL62882 configurations, programmed by the
ISEN2 pin status and the Rbias value.
If the ISEN2 pin is connected to the power stage, the ISL62882 is
in 2-phase CPU VR configuration. Rbias = 147k Ω disables the
overshoot reduction function and Rbias = 47k Ω enables it.
18
Protections
The ISL62882 provides overcurrent, current-balance,
undervoltage, overvoltage, and over-temperature protections.
The ISL62882 determines overcurrent protection (OCP) by
comparing the average value of the droop current I droop with an
internal current source threshold. It declares OCP when I droop is
above the threshold for 120μs. A resistor R comp from the COMP
pin to GND programs the OCP current source threshold, as well
FN6890.4
June 21, 2011
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| ISL62882CEVAL2Z | 功能描述:EVAL BOARD FOR ISL62882C 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 |
| ISL62882CHRTZ | 功能描述:电流型 PWM 控制器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62882CHRTZ-T | 功能描述:电流型 PWM 控制器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62882CIRTZ | 功能描述:电流型 PWM 控制器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL62882CIRTZ-T | 功能描述:电流型 PWM 控制器 2 PHS PWM BUCKG FOR MICROPROC PWR SUP RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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