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参数资料
| 型号： | MAX8566ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/20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
Due to the underdamped nature of the output LC dou-
ble pole, set the two zero frequencies of the Type 3
compensation less than the LC double-pole frequency
LX
L
to provide adequate phase boost. Set the two zero fre-
quencies to 80% of the LC double-pole frequency.
Hence:
MAX8566
R3
R2
C3
R 1 =
1
0 . 8 × C 1
×
L × C O × ( R O + ESR )
R L + R O
FB
COMP
R1
C1
R4
C 3 =
1
0 . 8 × R 3
×
L × C O × ( R O + ESR )
R L + R O
Set the second compensation pole, f P2_EA , at f Z_ESR
C2
yields:
Figure 4. Type 3 Compensation Network
C 2 =
C O × C 1 × ESR
R 1 × C 1 ? C O × ESR
determined by the frequencies of the double pole and
ESR zero of the power transfer function. It is also a func-
tion of the desired closed-loop bandwidth. The following
Set the third compensation pole at 1/2 of the switching
frequency to gain some phase margin. Calculate R2 as
follows:
section outlines the step-by-step design procedure to
calculate the required compensation components.
Begin by setting the desired output voltage. The output
voltage is set using a resistor-divider from the output to
R 2 =
1
π × C 3 × f S
GND with FB at the center tap (R3 and R4 in Figure 4).
Use 20k ? for R4 and calculate R3 as:
The above equations provide accurate compensation
when the zero-cross frequency is significantly higher
R 3 = R 4 × ? OUT
? 1 ?
? V
? 0 . 6 V
?
?
than the double-pole frequency. When the zero-cross
frequency is near the double-pole frequency, the actual
zero-cross frequency is higher than the calculated fre-
quency. In this case, lowering the value of R1 reduces
The zero-cross frequency of the closed-loop, f C , should
be less than 20% of the switching frequency, f S .
Higher zero-cross frequency results in faster transient
response. It is recommended that the zero-cross fre-
quency of the closed loop should be chosen between
10% and 20% of the switching frequency. Once f C is
chosen, C1 is calculated from the following equation:
the zero-cross frequency. Also, set the third pole of the
Type 3 compensation close to the switching frequency
if the zero-cross frequency is above 200kHz to boost
the phase margin. Note that the value of R4 can be
altered to make the values of the compensation compo-
nents practical. The recommended range for R4 is
10k ? to 50k ? .
PCB Layout Considerations
1 . 5625 ×
f C × 2 × π × R 3 × ? 1 +
C 1 =
V IN
V P - P
?
?
R L ?
R O ? ?
and Thermal Performance
The MAX8566EVKIT provides an optimal layout and
should be followed closely. For custom design, follow
these guidelines:
1) Place decoupling capacitors (V DD and SS) as close
where V P-P is the ramp peak-to-peak voltage (1V typ).
to the IC as possible. Keep the power ground plane
(connected to PGND) and signal ground plane (con-
nected to GND) separate.
______________________________________________________________________________________
17
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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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