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| 型号： | MAX17410GTM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 40/45页 |
| 文件大小： | 0K |
| 描述： | IC CTLR QPWM 2PH FOR IMV 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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Dual-Phase, Quick-PWM Controller
for IMVP6+ CPU Core Power Supplies
(
)
? ? + t OFF (M IN ) ?
2 ? ? V OUT t SW ? ?
L Δ I LOAD(MAX) ? ? M
?
?
? ? ( V IN OUT ) t SW ? ?
? ? ?
2 C OUT V OUT ? ? ? - 2 t OFF ( MIN ) ?
? ? + t OFF ( MIN ) ?
? ? ?
? ?
V SAG =
+
? V IN
- 2 V
Δ I LOAD(MAX) ? ? V OUT t SW ? ?
?
V IN ? ?
?
2 C OUT V IN ?
In non-CPU applications, the output capacitor’s size
often depends on how much ESR is needed to maintain
an acceptable level of output-ripple voltage. The out-
put-ripple voltage of a step-down controller equals the
total inductor ripple current multiplied by the output
capacitor’s ESR. When operating multiphase systems
out-of-phase, the peak inductor currents of each phase
are staggered, resulting in lower output ripple voltage
by reducing the total inductor ripple current. For multi-
( Δ I LOAD ( MAX ) ) 2 L
2 η TOTAL OUT OUT
V SOAR ≈
? ? (
V IN TOTAL OUT ) V OUT ? ? RI P PLE
R ESR ≤ ? ? V
I LIMIT ( LOW ) > ?
f ESR ≤ SW
where t OFF(MIN) is the minimum off-time (see the
Electrical Characteristics table).
The amount of overshoot due to stored inductor energy
can be calculated as:
C V
where η TOTAL is the total number of active phases.
Setting the Current Limit
The minimum current-limit threshold must be high
enough to support the maximum load current when the
current limit is at the minimum tolerance value. The val-
ley of the inductor current occurs at I LOAD(MAX) minus
half the ripple current; therefore:
? I LOAD ( MAX ) ? ? LIR ?
? ? ?
? η TOTAL ? ? 1 - 2 ?
where η TOTAL is the total number of active phases, and
I LIMIT(LOW) equals the minimum current-limit threshold
voltage divided by the current-sense resistor (R SENSE ).
For the 22.5mV default setting, the minimum current-
limit threshold is 19.5mV.
Output Capacitor Selection
The output filter capacitor must have low enough effec-
tive series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements.
phase operation, the maximum ESR to meet ripple
requirements is:
? V IN f SW L ?
- η V
where η TOTAL is the total number of active phases and
f SW is the switching frequency per phase. The actual
capacitance value required relates to the physical size
needed to achieve low ESR, as well as to the chemistry
of the capacitor technology. Thus, the capacitor is usu-
ally selected by ESR and voltage rating rather than by
capacitance value (this is true of polymer types).
When using low-capacity ceramic filter capacitors,
capacitor size is usually determined by the capacity
needed to prevent V SAG and V SOAR from causing
problems during load transients. Generally, once
enough capacitance is added to meet the overshoot
requirement, undershoot at the rising load edge is no
longer a problem (see the V SAG and V SOAR equations
in the Transient Response section).
Output Capacitor Stability Considerations
For Quick-PWM controllers, stability is determined by
the value of the ESR zero relative to the switching fre-
quency. The boundary of instability is given by the fol-
lowing equation:
f
π
where:
In CPU V CORE converters and other applications where
the output is subject to large load transients, the output
capacitor’s size typically depends on how much ESR is
f ESR =
1
2 π R EFF C OUT
( R ESR PCB ) ≤ Δ I
+ R
needed to prevent the output from dipping too low
under a load transient. Ignoring the sag due to finite
capacitance:
V STEP
LOAD ( MAX )
and:
R EFF = R ESR + R DROOP + R PCB
where C OUT is the total output capacitance, R ESR is the
total equivalent-series-resistance, R DROOP is the voltage-
positioning gain, and R PCB is the parasitic board resistance
between the output capacitors and sense resistors.
40
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17411GTM+ | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller 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 |
| MAX17411GTM+T | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller 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 |
| MAX17411RGTM+ | 功能描述:电流型 PWM 控制器 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 |
| MAX17411RGTM+T | 功能描述:电流型 PWM 控制器 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 |
| MAX17411RGTM+TW | 功能描述:电流型 PWM 控制器 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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