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参数资料
| 型号： | MAX5003ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16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
0V
XFACOILTRCTX03
2
L P
65 μ H
CMSD4448
8
R1
IRFD620S
4.7 μ F
1M
7
ES
0.1 μ F
R2
39k
62k
1
2
3
4
5
6
7
8
V+ V DD
INDIV V CC
NDRV
MAX5003
FREQ
PGND
SS CS
REF AGND
CON MAXTON
COMP FB
16
15
14
13
12
11
10
9
10 μ F
33 μ F
100 ?
0.1 μ F
5
MBRS130L
11, 12
9, 10
6
22 μ F
22 μ F
240k
680 ?
51 ?
0.01 μ F
+5V
1A
-
1.3k
7
1
5
MDC217
2
3900pF
0.1 μ F
470nF
0.1 μ F
24.9k
V IN
-48V
51k
R CS
0.1 ?
TL431
24.9k
-36V TO -72V
Figure 3. Application Example 2: Isolated -48V to +5V Converter
where:
DC = Duty cycle. Set to calculated minimum duty
cycle at V MIN.
PWR IN = Input power, at maximum output power
This gives an inductance value (L PRI ) of approxi-
mately 65μH.
5) The other parameter that defines the transformer is
peak current. This is given by:
6) For this application, the MAX5003 must be pro-
grammed for a maximum duty cycle of 55% at 36V.
The MAX5003 will automatically scale the limit with
the reciprocal of the input voltage as it changes. The
duty-cycle limit for an input voltage of 72V will be
27% (half of 55%). The duty cycle needed to stay out
of continuous conduction at 72V is 37%, so there is a
10% margin. The maximum duty time scales with the
voltage at the undervoltage lockout pin, V INDIV . The
voltage at INDIV is set by selecting the power line
I PRI =
2 × PWR IN
L PRI × ? SW
=
2 × 6.25W
65 μ H × 300kHz
= 0.8A
undervoltage lockout trip point. The trip point for this
system, running from 36V to 72V, is 32V. Then INDIV
must be connected to the center point of a divider
with a ratio of 32/1.25, connected between the
DC ( MIN ) = DC ( MAX ) ×
= 43 % ×
=
? V ? ? 100 kHz ? ? DC MAX ( V MIN ) ?
R MAXTON = ? MIN ? ? ? ? ? 200 k ?
= ?
? 200 k ? = 55 k ?
? 36 V ? ? 100 kHz ? ? 55 % ?
? 32 V ? ? 300 kHz ? ? 75 % ?
The peak secondary current is the peak primary cur-
rent multiplied by the turns ratio, or 0.8A · 8 = 6.4A.
Calculating the minimum duty cycle:
V IN ( MIN ) 36 V
V IN ( MAX ) 72 V
With these numbers, the transformer manufacturer
can choose a core.
power line and ground. Then R MAXTON is:
? V UVL ? ? ? SW ? ? 75 % ?
? ? ? ?
______________________________________________________________________________________
13
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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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