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参数资料
| 型号： | MAX5015EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT FOR MAX5015 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 10A |
| 输入电压： | 36 ~ 72V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 275kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX5015 |
Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies
ing equation to calculate the tertiary winding turns
ratio:
where V D is the output Schottky diode forward volt-
age drop (0.5V) and LIR is the ratio of inductor rip-
ple current to DC output current.
( 5 . 5 ) × ( 1 - 0 . 198 )
0 . 4 × 275 kHz × 10 A
V DDMIN + 0 . 7
V IN_MIN
V DDMAX + 0 . 7
V IN_MAX
× N P ≤ N T ≤
× N P
L ≥ = 4 . 01 μ H
8) The size and ESR of the output filter capacitor deter-
V RIPPLE = V RIPPLE , ESR RIPPLE , C
+ V
× 1 4 ≤ N T ≤ × 14
where:
V DDMIN is the minimum V DD supply voltage (13V).
V DDMAX is the maximum V DD supply voltage (36V).
V IN_MIN is the minimum input voltage (36V).
V IN_MAX is the maximum input voltage (72V in this
design example).
N P is the number of turns of the primary winding.
N T is the number of turns of the tertiary winding.
13 . 7 36 . 7
36 72
5 . 33 ≤ N T ≤ 7 . 14
Choose N T = 6.
6) Choose R SENSE according to the following equation:
mine the output ripple. Choose a capacitor with a
low ESR to yield the required ripple voltage.
Use the following equations to calculate the peak-to-
peak output ripple:
2 2
where:
V RIPPLE is the combined RMS output ripple due to
V RIPPLE,ESR , the ESR ripple, and V RIPPLE,C , the
capacitive ripple. Calculate the ESR ripple and
capacitive ripple as follows:
V RIPPLE,ESR = I RIPPLE x ESR
V RIPPLE,C = I RIPPLE /(2 x π x 275kHz x C OUT )
Layout Recommendations
R SENSE ≤
N S
N P
V ILIM
× 1 . 2 × I OUTMAX
All connections carrying pulsed currents must be very
short, be as wide as possible, and have a ground plane
as a return path. The inductance of these connections
must be kept to a minimum due to the high di/dt of the
where:
V ILim is the current-sense comparator trip threshold
voltage (0.465V).
N S /N P is the secondary side turns ratio (5/14 in this
example).
I OUTMAX is the maximum DC output current (10A in
this example).
currents in high-frequency switching power converters.
Current loops must be analyzed in any layout pro-
posed, and the internal area kept to a minimum to
reduce radiated EMI. Ground planes must be kept as
intact as possible.
Chip Information
× 1 . 2 × 10
R SENSE ≤
0 . 465 V
5
14
= 109 m ?
TRANSISTOR COUNT: 589
PROCESS: BiCMOS
7) Choose the inductor value so that the peak ripple
current (LIR) in the inductor is between 10% and
20% of the maximum output current.
L ≥
( V OUT + V D ) × ( 1 - D MIN )
2 × LIR × 275 kHz × I OUTMAX
12
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| MAX5015EVKIT+ | 功能描述:电流型 PWM 控制器 MAX5015 Eval Kit 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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