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参数资料
| 型号： | MAX5003ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO VM 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 75% |
| 电源电压： | 11 V ~ 110 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Voltage PWM
Power-Supply Controller
+48V
V IN
(36V TO 72V)
XFACOILTRCTX03
2
8
1M
L P
65 μ H
CMSD4448
4.7 μ F
1
V+
V DD
16
5
7
2
3
INDIV
ES
V CC
NDRV
15
14
IRFD620S
11, 12
MBRS130L
+5V
1A
0.1 μ F
4
5
6
7
8
MAX5003
FREQ
PGND
SS CS
REF AGND
CON MAXTON
COMP FB
13
12
11
10
9
10 μ F
33 μ F
100 ?
0.1 μ F
9, 10
22 μ F
22 μ F
R A
41.2k
39k
62k
51k
0.1 μ F
470nF
0.1 μ F
C F
390pF
R F
200k
R CS
0.1 ?
R B
17.4k
0V
Figure 2. Application Example 1: Nonisolated +48V to +5V Converter
DC MAX =
? ?
? + 1
?
( DC × V MIN ) ( V )
3) The main factors influencing the choice of the turns
ratio are the switch breakdown voltage and the duty
cycle. With a smaller turns ratio, the secondary
reflected voltage and the maximum voltage seen by
the switch during flyback are reduced, which is
favorable. On the other hand, a smaller turns ratio
will shorten the duty cycle and increase the primary
RMS current, which can impact efficiency. A good
starting figure is the ratio of the input voltage to the
output voltage, rounding to the nearest integer. To
keep the flyback voltage under control, choose an 8-
to-1 ratio for the 48V to 5V system. The maximum
duty cycle allowed without putting the device in con-
tinuous-conduction mode can be found using the fol-
lowing formula:
1
V MIN
? V SEC × N ?
where:
N = N P /N S = Turns ratio
V SEC = Secondary voltage
DC MAX = Maximum duty cycle
V MIN = Minimum power-line voltage
For a 48V to 5V system with an 8-to-1 turns ratio, the
maximum duty cycle before putting the device in
discontinuous mode is 55%. Assume that V IN min is
36V (minimum input voltage, neglecting drops in the
power switch and in the resistance of the primary
coil) and V SEC is 5.4V (5V plus a Schottky diode
drop). The MAX5003 maximum duty cycle is internal-
ly limited to 75%. Generally this parameter must fall
between 45% to 65% to obtain a balance between
efficiency and flyback voltage while staying out of
continuous conduction. If the value exceeds these
bounds, adjust the turns ratio.
4) Assuming 80% efficiency, a 6.25W input is needed
to produce a 5W output. Set an operating duty cycle
around 12% below the maximum duty cycle to allow
for component variation: 55% - 12% = 43%. Use the
following formula to calculate the primary inductance:
2 2
0 . 43 × 36
L PRI = = ? 65 μ H
2 × PWR IN × ? SW 2 × 6 . 25 W × 300 kHz
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5003EVKIT | 功能描述:电压模式 PWM 控制器 MAX5003 Eval Kit 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 |
| MAX5003EVKIT50W | 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 |
| MAX5004CAX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX5005 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Evaluation Kit Evaluation System for the MAX1618[MAX1618EVKIT/MAX1618EVSystem ] |
| MAX5005ACUB | 功能描述:低压差稳压器 - LDO 150mA USB LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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