参数资料
| 型号： | ISL6564AIRZ |
| 厂商： | Intersil |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 40-QFN |
| 标准包装： | 500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.7% |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 管件 |
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ISL6564A
P UP , 1 ≈ V IN ? ------ + --------- ? ? ---- 1 ? f S
R ISEN , 2 = R ISEN ---------- 2
Δ T 1
ramps up to assume the full inductor current. In Equation 16,
the required time for this commutation is t 1 and the
approximated associated power loss is P UP,1 .
I M I PP ? t ? (EQ. 16)
? N 2 ? ? 2 ?
At turn on, the upper MOSFET begins to conduct and this
transition occurs over a time t 2 . In Equation 17, the
approximate power loss is P UP,2 .
decrease in temperature rise in order to cause proportionally
less current to flow in the hotter phase.
Δ T
(EQ. 21)
In Equation 21, make sure that Δ T 2 is the desired temperature
rise above the ambient temperature, and Δ T 1 is the measured
temperature rise above the ambient temperature. While a
single adjustment according to Equation 21 is usually
sufficient, it may occasionally be necessary to adjust R ISEN
P UP , 2 ≈ V IN ? ------ – --------- ? ? ---- 2 ? f S
? I M I PP ? ? t ?
? N 2 ? ? 2 ?
(EQ. 17)
two or more times to achieve optimal thermal balance
between all channels.
P UP , 3 = V IN Q rr f S
R FB = -------------------------
70 × 10
A third component involves the lower MOSFET’s reverse-
recovery charge, Q rr . Since the inductor current has fully
commutated to the upper MOSFET before the lower-
MOSFET’s body diode can draw all of Q rr , it is conducted
through the upper MOSFET across VIN. The power
dissipated as a result is P UP,3 and is approximately
(EQ. 18)
Finally, the resistive part of the upper MOSFET’s is given in
Equation 19 as P UP,4 .
The total power dissipated by the upper MOSFET at full load
can now be approximated as the summation of the results
from Equations 16, 17, 18 and 19. Since the power
Load-Line Regulation Resistor
The load-line regulation resistor is labeled R FB in Figure 8.
Its value depends on the desired full-load droop voltage
(V DROOP in Figure 8). If Equation 20 is used to select each
ISEN resistor, the load-line regulation resistor is as shown in
Equation 22.
V DROOP
(EQ. 22)
– 6
If one or more of the ISEN resistors is adjusted for thermal
balance, as in Equation 21, the load-line regulation resistor
should be selected according to Equation 23 where I FL is the
full-load operating current and R ISEN(n) is the ISEN resistor
connected to the n th ISEN pin.
I FL r DS ( ON )
equations depend on MOSFET parameters, choosing the
correct MOSFETs can be an iterative process involving
repetitive solutions to the loss equations for different
MOSFETs and different switching frequencies.
V DROOP
R FB = --------------------------------
Compensation
∑ R ISEN ( n )
n
(EQ. 23)
I PP2
? I M ?
P UP , 4 ≈ r DS ( ON ) ? ------ ? d + ----------
? N ? 12
2
(EQ. 19)
The two opposing goals of compensating the voltage
regulator are stability and speed. Depending on whether the
regulator employs the optional load-line regulation as
R ISEN = -----------------------
70 × 10 – 6
Current Sensing Resistor
The resistors connected between these pins and the
respective phase nodes determine the gains in the load-line
regulation loop and the channel-current balance loop as well
as setting the overcurrent trip point. Select values for these
resistors based on the room temperature r DS(ON) of the
lower MOSFETs, DCR of inductor or additional resistor; the
full-load operating current, I FL ; and the number of phases, N
using Equation 20.
R X I FL (EQ. 20)
--------
N
In certain circumstances, it may be necessary to adjust the
value of one or more ISEN resistor. When the components of
one or more channels are inhibited from effectively
dissipating their heat so that the affected channels run hotter
than desired, choose new, smaller values of RISEN for the
affected phases (see the section entitled Channel-Current
Balance ). Choose R ISEN,2 in proportion to the desired
22
described in Load-Line Regulation , there are two distinct
methods for achieving these goals.
COMPENSATING LOAD-LINE REGULATED
CONVERTER
The load-line regulated converter behaves in a similar
manner to a peak-current mode controller because the two
poles at the output-filter L-C resonant frequency split with
the introduction of current information into the control loop.
The final location of these poles is determined by the system
function, the gain of the current signal, and the value of the
compensation components, R C and C C .
Since the system poles and zero are affected by the values
of the components that are meant to compensate them, the
solution to the system equation becomes fairly complicated.
Fortunately there is a simple approximation that comes very
close to an optimal solution. Treating the system as though it
were a voltage-mode regulator by compensating the L-C
poles and the ESR zero of the voltage-mode approximation
yields a solution that is always stable with very close to ideal
transient performance.
FN6285.1
March 20, 2007
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6564AIRZ-T | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6564CR | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6564CR-T | 功能描述:IC REG CTRLR BUCK PWM VM 40-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6564CRZ | 功能描述:电流型 PWM 控制器 LEAD-FREE MULTI-PHASE PWM CONTROLLER W/ 0.525-1.3 VID 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 |
| ISL6564CRZ-T | 功能描述:电流型 PWM 控制器 LEAD-FREE MULTI-PHASE PWM CONTROLLER W/ 0.525-1.3 VID, T&R 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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