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参数资料
| 型号： | MAX5053BEUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST ISO PWM 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 290kHz |
| 占空比： | 76% |
| 电源电压： | 10.8 V ~ 24 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
Current-Mode PWM Controllers with an Error
Amplifier for Isolated/Nonisolated Power Supplies
D1
T1
+V IN
D2
V OUT
R1
R2
Q1
C4
V IN
U1
NDRV
C1
V CC MAX5052
CS
U2
R8
R9
U2
OPTO TRANS
R5
R7
COMP
FB
GND
UVLO/EN
R4
OPTO LED
U3
TL431
C3
R6
C2
R3
R10
-V IN
Figure 3. Secondary-Side Regulated, Isolated Power Supply
smaller. However, in this mode, the input voltage range
has to be roughly 2:1. Another consideration is if the bias
winding is in phase with the output, then the power sup-
ply hiccups and soft-start under output short-circuit con-
ditions. Whereas, this property is lost if the bias winding
is in phase with the MOSFET ON time.
Soft-Start
The MAX5052/MAX5053 soft-start feature allows the load
voltage to ramp up in a controlled manner, eliminating
output voltage overshoot. Soft-start begins after UVLO is
deasserted. The voltage applied to the noninverting
node of the amplifier ramps from 0 to 1.23V in over a
60ms soft-start timeout period. Figure 4 shows the 5V
output of the power-supply circuit in Figure 5 during
startup. Note the staircase increase of the output volt-
age. This is a result of the digital soft-starting technique
used. Unlike other devices, the MAX5052/MAX5053 ref-
erence voltage to the internal amplifier is soft-started;
this method results in superior control of the output volt-
age under heavy- and light-load conditions.
N-Channel MOSFET Switch Driver
The NDRV pin drives an external N-channel MOSFET.
The NDRV output is supplied by the internal regulator
(V CC ), which is internally set to approximately 9.5V. For
the universal input voltage range, the MOSFET used
must be able to withstand the DC level of the high-line
input voltage plus the reflected voltage at the primary of
the transformer. For most offline applications that use the
discontinuous flyback topology, this requires a MOSFET
rated at 600V. NDRV can source/sink in excess of the
1V/div
0V
10ms/div
Figure 4. Output Voltage Soft-Start During Initial Startup for the
Circuit of Figure 5
650mA/1000mA peak current, so select a MOSFET that
yields acceptable conduction and switching losses.
Internal Oscillator
The internal oscillator switches at 1.048MHz and is
divided down to 262kHz by two D flip-flops. The
MAX5052A/MAX5053A invert the Q output of the last D
flip-flop to provide a duty cycle of 50% (Figure 6). The
MAX5052B/MAX5053B perform a logic NAND opera-
tion on the Q outputs of both D flip-flops to provide a
duty cycle of 75%.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5053BEUA+ | 功能描述:电流型 PWM 控制器 w/Error Amplifier 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 |
| MAX5053BEUA+T | 功能描述:电流型 PWM 控制器 w/Error Amplifier 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 |
| MAX5053BEUA-T | 功能描述:电流型 PWM 控制器 w/Error Amplifier 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 |
| MAX5054 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4A, 20ns, Dual MOSFET Drivers |
| MAX5054_10 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4A, 20ns, Dual MOSFET Drivers |
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