参数资料
| 型号： | ISL62883IRTZ |
| 厂商： | Intersil |
| 文件页数： | 22/37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页第18页第19页第20页第21页当前第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
Substitution of Equation 28 into Equation 1 gives Equation 29:
For resistor sensing, substitution of Equation 33 into Equation 2
I droop = ----- × ----------------------------------------- × ------------ × I o
R sum
R i
V droop 2R sen × R droop
N × R i
I o
2 R ntcnet DCR
N
R ntcnet + --------------
N
(EQ. 29)
gives the load line slope expression :
LL = ------------------ = -----------------------------------------
(EQ. 37)
R i = -------------------------------------------------------------------------------- (EQ. 30)
N × ? R ntcnet + -------------- ? × I droop
R droop = ---------------- × LL
I droop
Therefore :
2R ntcnet × DCR × I o
R sum
? N ?
Substitution of Equation 20 and application of the OCP condition
in Equation 30 gives Equation 31:
Substitution of Equation 30 and rewriting Equation 36, or
substitution of Equation 34 and rewriting Equation 37 gives the
same result in Equation 38:
I o
(EQ. 38)
2 × --------------------------------------------------- × DCR × I omax
? ( R ntcs + R ntc ) × R p
R i = -------------------------------------------------------------------------------------------------------------------------
N × ? --------------------------------------------------- + -------------- ? × I droopmax
R ntcs + R ntc + R p
? ?
( R ntcs + R ntc ) × R p
R ntcs + R ntc + R p
R sum ?
N
(EQ. 31)
One can use the full load condition to calculate R droop . For
example, given I omax = 51A, I droopmax = 40.9μA and
LL = 1.9m Ω , Equation 38 gives R droop = 2.37k Ω .
It is recommended to start with the R droop value calculated by
Equation 38, and fine tune it on the actual board to get accurate
where I omax is the full load current, I droopmax is the
corresponding droop current. For example, given N = 3,
R sum = 3.65k Ω , R p = 11k Ω , R ntcs = 2.61k Ω , R ntc = 10k Ω ,
DCR = 0.88m Ω , I omax = 51A and I droopmax = 40.9μA, Equation
31 gives R i = 606 Ω .
For resistor sensing, Equation 32 gives the DC relationship of
V cn (s) and I o (s).
load line slope. One should record the output voltage readings at
no load and at full load for load line slope calculation. Reading
the output voltage at lighter load instead of full load will increase
the measurement error.
Current Monitor
Refer to Equation 18 for the IMON pin current expression.
V Cn = ------------ × I o
R sen
N
(EQ. 32)
Refer to Figures 1 and 2, the IMON pin current flows through
R imon . The voltage across R imon is expressed in Equation 39:
Substitution of Equation 32 into Equation 1 gives Equation 33:
V Rimon = 3 × I droop × R imon
(EQ. 39)
I droop = ----- × ------------ × I o
R i
R i = ---------------------------
N × I droop
I droop = ------------------ × LL
R droop
3I o × LL
V Rimon = --------------------- × R imon (EQ. 41)
N × I droopmax
3I o × LL
2 R sen (EQ. 33)
N
Therefore:
2R sen × I o
(EQ. 34)
Substitution of Equation 34 and application of the OCP condition
in Equation 30 gives :
2R sen × I omax (EQ. 35)
R i = --------------------------------------
where I omax is the full load current, I droopmax is the
corresponding droop current. For example, given N = 3,
R sen = 1m Ω , I omax = 51A and I droopmax = 40.9μA, Equation 35
gives R i = 831 Ω .
A resistor from COMP to GND can adjust the internal OCP
threshold, providing another dimension of fine-tune flexibility.
Table 3 shows the detail. It is recommended to scale I droop such
that the default OCP threshold gives approximately the desired
OCP level, then use R comp to fine tune the OCP level if necessary.
Load Line Slope
Refer to Figure 9.
For inductor DCR sensing, substitution of Equation 29 into
Rewriting Equation 38 gives Equation 40:
I o
(EQ. 40)
Substitution of Equation 40 into Equation 39 gives Equation 41:
R droop
Rewriting Equation 41 and application of full load condition gives
Equation 42:
V Rimon × R droop
R imon = -------------------------------------------- (EQ. 42)
For example, given LL = 1.9m Ω , R droop = 2.37k Ω ,
V Rimon = 963mV at I omax = 51A, Equation 42 gives
R imon = 7.85k Ω .
A capacitor C imon can be paralleled with R imon to filter the IMON
pin voltage. The R imon C imon time constant is the user’s choice. It
is recommended to have a time constant long enough such that
switching frequency ripples are removed.
Compensator
Figure 15 shows the desired load transient response waveforms.
Figure 21 shows the equivalent circuit of a voltage regulator (VR)
with the droop function. A VR is equivalent to a voltage source
V droop 2R droop R ntcnet DCR
I o R i R sum
Equation 2 gives the load line slope expression :
LL = ------------------ = ---------------------- × ----------------------------------------- × ------------
N
N
R ntcnet + --------------
22
(EQ. 36)
(= VID) and output impedance Z out (s). If Z out (s) is equal to the
load line slope LL, i.e. constant output impedance, in the entire
frequency range, V o will have square response when I o has a
square change.
FN6891.4
June 21, 2011
相关PDF资料 |
PDF描述 |
|---|---|
| ISL6292BCRZ | IC CHARGER LI-ION 4.2V 4X4 16QFN |
| ISL6294IBZ | IC CHRGR LI-ION SGL 8-SOIC |
| ISL6306IRZ | IC REG CTRLR BUCK PWM VM 40-QFN |
| ISL6307AIRZ | IC REG CTRLR BUCK PWM VM 48-QFN |
| ISL6307BIRZ | IC REG CTRLR BUCK PWM VM 48-QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。