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| 型号： | MAX8760ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 32/39页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR QUICK PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，6 位 VID AMD 移动式 Turion? |
| 输入电压： | 4 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 0.38 V ~ 1.55 V |
| 工作温度： | 0°C ~ 85°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（6x6） |
| 包装： | 管件 |
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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
Transient Response
The inductor ripple current impacts transient-response
performance, especially at low V IN - V OUT differentials.
Low inductor values allow the inductor current to slew
faster, replenishing charge removed from the output
filter capacitors by a sudden load step. The amount of
output sag is also a function of the maximum duty fac-
tor, which can be calculated from the on-time and mini-
mum off-time. For a dual-phase controller, the
worst-case output sag voltage can be determined by:
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.
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
needed to prevent the output from dipping too low
under a load transient. Ignoring the sag due to finite
L ( ? I LOAD ( MAX ) ) 2 ? ? OUT ? + t OFF ( MIN ) ?
? V IN ?
2 C OUT V OUT ? ? ? ? 2 t OFF ( MIN ) ?
? ? ?
? ?
V SAG =
? ? V K ? ?
? ?
? ?
? ? ( V IN ? 2 V OUT ) K ? ?
V IN ?
capacitance:
V STEP
R ESR ≤
? I LOAD ( MAX )
In non-CPU applications, the output capacitor’s size
? ? ? + t OFF ( MIN ) ?
?
?
+
? I LOAD ( MAX ) ? ? V OUT K ? ?
2 C OUT ? V IN ?
often depends on how much ESR is needed to maintain
an acceptable level of output ripple voltage. The output
ripple voltage of a step-down controller equals the total
where t OFF(MIN) is the minimum off-time (see the
Electrical Characteristics table) and K is from Table 6.
The amount of overshoot due to stored inductor energy
can be calculated as:
inductor ripple current multiplied by the output capaci-
tor’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 3- or
V SOAR ≈
( ? I LOAD ( MAX ) ) 2 L
2 η TOTAL C OUT V OUT
4-phase operation, the maximum ESR to meet ripple
requirements is:
( 2 V IN ? η TOTAL V OUT ON ? η TOTAL V OUT TRIG
where η TOTAL is the total number of active phases.
Setting the Current Limit
The minimum current-limit threshold must be high
R ESR ≤
V RIPPLE L
) t t
I LIMIT ( LOW ) > ? LOAD ( MAX ) ?
? 1 ? ?
? η TOTAL ?
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 ? ? LIR ?
? 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 30mV default setting, the minimum current-limit
threshold is 28mV.
Connect ILIM to V CC for the default current-limit thresh-
old (see the Electrical Characteristics table). In
adjustable mode, the current-limit threshold is precisely
1/20 the voltage seen at ILIM. For an adjustable thresh-
old, connect a resistive divider from REF to GND with
ILIM connected to the center tap. When adjusting the
current limit, use 1% tolerance resistors with approxi-
mately 10μA of divider current to prevent a significant
increase of errors in the current-limit tolerance.
where η TOTAL is the total number of active phases, t ON
is the calculated on-time per phase, and t TRIG is the trig-
ger delay between the master’s DH rising edge and the
slave’s DH rising edge. The trigger delay must be less
than 1/(f SW x η TOTAL ) for stable operation. 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 usual-
ly 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).
32
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8760ETL+ | 功能描述:电流型 PWM 控制器 Dual-Phase Quick PWM 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 |
| MAX8760ETL+T | 功能描述:电流型 PWM 控制器 Dual-Phase Quick PWM 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 |
| MAX8760ETL-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 |
| MAX8760EVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX8760 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 |
| MAX8761ETG+ | 功能描述:LCD 驱动器 Linear-Regulator LCD Panel Power Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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