参数资料
| 型号： | ISL62883IRTZ |
| 厂商： | Intersil |
| 文件页数： | 18/37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 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页
ISL62883, ISL62883B
value by +200mV for 1ms, the ISL62883 will declare a fault and
dessert PGOOD.
The ISL62883 takes the same actions for all of the above fault
protections: desertion of PGOOD and turn-off of the high-side and
low-side power MOSFETs. Any residual inductor current will decay
through the MOSFET body diodes. These fault conditions can be
reset by bringing VR_ON low or by bringing V DD below the POR
threshold. When VR_ON and V DD return to their high operating
levels, a soft-start will occur.
The second level of overvoltage protection is different. If the
output voltage exceeds 1.55V, the ISL62883 will immediately
declare an OV fault, dessert PGOOD, and turn on the low-side
As Figures 1 and 2 show, a resistor R imon is connected to the
IMON pin to convert the IMON pin current to voltage. A capacitor
can be paralleled with R imon to filter the voltage information. The
IMVP-6.5? specification requires that the IMON voltage
information be referenced to VSSSENSE.
The IMON pin voltage range is 0V to 1.1V. A clamp circuit
prevents the IMON pin voltage from going above 1.1V.
FB2 Function
The FB2 function is only available when the ISL62883 is in
2-phase configuration, when pin 9 serves the FB2 function
instead of the ISEN3 function.
power MOSFETs. The low-side power MOSFETs remain on until
CONTROLLER IN
C1 R2
CONTROLLER IN
C1 R2
the output voltage is pulled down below 0.85V when all power
MOSFETs are turned off. If the output voltage rises above 1.55V
again, the protection process is repeated. This behavior provides
2-PHASE MODE
C2 R3
FB2
C3.1
C3.2
1-PHASE MODE
C2 R3
FB2
C3.1
C3.2
the maximum amount of protection against shorted high-side
power MOSFETs while preventing output ringing below ground.
Resetting VR_ON cannot clear the 1.55V OVP. Only resetting V DD
will clear it. The 1.55V OVP is active all the time when the
VSEN
R1
FB
Vref
E/A
VSEN
COMP
R1
FB
Vref
E/A
COMP
controller is enabled, even if one of the other faults have been
declared. This ensures that the processor is protected against
high-side power MOSFET leakage while the MOSFETs are
commanded off.
The ISL62883 has a thermal throttling feature. If the voltage on
the NTC pin goes below the 1.18V OT threshold, the VR_TT# pin is
pulled low indicating the need for thermal throttling to the
system. No other action is taken within the ISL62883 in response
to NTC pin voltage.
Table 4 summarizes the fault protections.
FIGURE 13. FB2 FUNCTION IN 2-PHASE MODE
Figure 13 shows the FB2 function. A switch (called FB2 switch)
turns on to short the FB and the FB2 pins when the controller is in
2-phase mode. Capacitors C3.1 and C3.2 are in parallel, serving
as part of the compensator. When the controller enters 1-phase
mode, the FB2 switch turns off, removing C3.2 and leaving only
C3.1 in the compensator. The compensator gain will increase
with the removal of C3.2. By properly sizing C3.1 and C3.2, the
compensator cab be optimal for both 2-phase mode and 1-phase
mode.
.
TABLE 4. FAULT PROTECTION SUMMARY
When the FB2 switch is off, C3.2 is disconnected from the FB pin.
FAULT TYPE
Overcurrent
Way-Overcurrent
(2.5xOC)
FAULT DURATION
BEFORE
PROTECTION
120μs
<2μs
PROTECTION
ACTION
PWM tri-state,
PGOOD latched
low
FAULT
RESET
VR_ON
toggle or
VDD toggle
However, the controller still actively drives the FB2 pin voltage to
follow the FB pin voltage such that C3.2 voltage always follows
C3.1 voltage. When the controller turns on the FB2 switch, C3.2
will be reconnected to the compensator smoothly.
The FB2 function ensures excellent transient response in both
2-phase mode and 1-phase mode. If one decides not to use the
FB2 function, simply populate C3.1 only.
Overvoltage +200mV
Undervoltage -300mV
Phase Current
Unbalance
Overvoltage 1.55V
Over-Temperature
1ms
Immediately
Low-side MOSFET VDD toggle
on until V core
<0.85V, then
PWM tri-state,
PGOOD latched
low.
1ms N/A
Adaptive Body Diode Conduction Time
Reduction
In DCM, the controller turns off the low-side MOSFET when the
inductor current approaches zero. During on-time of the low-side
MOSFET, phase voltage is negative and the amount is the
MOSFET R dson voltage drop, which is proportional to the inductor
current. A phase comparator inside the controller monitors the
phase voltage during on-time of the low-side MOSFET and
compares it with a threshold to determine the zero-crossing point
of the inductor current. If the inductor current has not reached
zero when the low-side MOSFET turns off, it’ll flow through the
Current Monitor
The ISL62883 provides the current monitor function. The IMON
pin outputs a high-speed analog current source that is 3 times of
the droop current flowing out of the FB pin. Thus Equation 18:
I IMON = 3 × I droop (EQ. 18)
18
low-side MOSFET body diode, causing the phase node to have a
larger voltage drop until it decays to zero. If the inductor current
has crossed zero and reversed the direction when the low-side
MOSFET turns off, it’ll flow through the high-side MOSFET body
diode, causing the phase node to have a spike until it decays to
zero. The controller continues monitoring the phase voltage after
turning off the low-side MOSFET and adjusts the phase
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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