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| 型号： | MAX8566ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 10A 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 3.1 V |
| 输入电压： | 2.3 V ~ 3.6 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 250kHz ~ 4.2MHz |
| 电流 - 输出： | 10A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
V IN ? V OUT
× OUT
I P ? P =
f P 1 _ LC = f P 2 _ LC =
2 π × L × C O × ? O
+ R
? R O L ?
f Z _ E SR =
f Z 1 _ EA =
The peak inductor current (I P-P ) is:
V
f s × L V IN
Use these equations for initial capacitor selection.
Determine final values by testing a prototype or an
evaluation circuit. A smaller ripple current results in less
output voltage ripple. Since the inductor ripple current
is a factor of the inductor value, the output voltage rip-
ple decreases with larger inductance. Use ceramic
capacitors for low ESR and low ESL at the switching
frequency of the converter. The low ESL of ceramic
capacitors makes ripple voltages negligible.
Load-transient response depends on the selected out-
put capacitance. During a load transient, the output
instantly changes by ESR x I LOAD . Before the controller
can respond, the output deviates further, depending on
the inductor and output capacitor values. After a short
time (see the Typical Operating Characteristics), the
controller responds by regulating the output voltage
back to its predetermined value. The controller
response time depends on the closed-loop bandwidth.
A higher bandwidth yields a faster response time, pre-
venting the output from deviating further from its regu-
lating value. See the Compensation Design section for
more details.
Input Capacitor Selection
The input capacitor reduces the current peaks drawn
from the input power supply and reduces switching
noise in the IC. The impedance of the input capacitor at
the switching frequency should be less than that of the
input source so high-frequency switching currents do
not pass through the input source but are instead
shunted through the input capacitor. High source
impedance requires high input capacitance. The input
capacitor must meet the ripple-current requirement
imposed by the switching currents. The RMS input rip-
ple current is given by:
determines the zero. The double pole and zero fre-
quencies are given as follows:
1
? R + ESR ?
?
1
2 π × ESR × C O
where R L is equal to the sum of the output inductor’s
DCR and the internal switch resistance, R DS(ON) . A
typical value for R DS(ON) is 8m ? . R O is the output load
resistance, which is equal to the rated output voltage
divided by the rated output current. ESR is the total
equivalent series resistance of the output filtering
capacitor. If there is more than one output capacitor of
the same type in parallel, the value of the ESR in the
above equation is equal to that of the ESR of a single
output capacitor divided by the total number of output
capacitors.
The high switching frequency range of the MAX8566
allows the use of ceramic output capacitors. Since the
ESR of ceramic capacitors is typically very low, the fre-
quency of the associated transfer-function zero is high-
er than the unity-gain crossover frequency, f C , and the
zero cannot be used to compensate for the double pole
created by the output filtering inductor and capacitor.
The double pole produces a gain drop of 40dB and a
phase shift of 90 degrees per decade. The error ampli-
fier must compensate for this gain drop and phase shift
to achieve a stable high-bandwidth closed-loop sys-
tem. Therefore, use Type 3 compensation as shown in
Figure 4. Type 3 compensation possesses three poles
and two zeros with the first pole, f P1_EA , located at zero
frequency (DC). Locations of other poles and zeros of
the Type 3 compensation are given by:
1
2 π × R 1 × C 1
V OUT × ( V IN ? V OUT )
I RIPPLE = I LOAD ×
V IN
where I RIPPLE is the input RMS ripple current.
Compensation Design
The power transfer function consists of one double pole
f Z 2 _ EA =
f P 2 _ EA =
f P 3 _ EA =
1
2 π × R 3 × C 3
1
2 π × R 1 × C 2
1
2 π × R 2 × C 3
and one zero. The double pole is introduced by the out-
put filtering inductor, L, and the output filtering capaci-
tor, C O . The ESR of the output filtering capacitor
The above equations are based on the assumptions
that C1>>C2, and R3>>R2, which are true in most
applications. Placement of these poles and zeros is
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8566ETJ+ | 功能描述:电压模式 PWM 控制器 10A Step-Down Regulator RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566ETJ+T | 功能描述:电压模式 PWM 控制器 10A Step-Down Regulator RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566ETJ-T | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX8566EVKIT | 制造商:Maxim Integrated Products 功能描述:10A OUTPUT STEPDOWN REGULATOR WITH - Rail/Tube |
| MAX8566EVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVALUATION KIT FOR THE MAX8566 - Boxed Product (Development Kits) |
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