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| 型号： | MAX5070AASA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK DIV ISO 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 97.5% |
| 电源电压： | 10.8 V ~ 25 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Performance, Single-Ended, Current-Mode
PWM Controllers
VP
MAX5071C
1V
2.5V
REFERENCE
PREREGULATOR
UVLO
16V/10V
VOLTAGE-
DIVIDER
2.5V
5V
2.5V
THERMAL
SHUTDOWN
EN-REF
V DD
7 V CC
26.5V
BG 5V REGULATOR
SNS
8 VREF
EN-DRV-BAR
DELAY
REG_OK
VP
VOLTAGE-
DIVIDER
1V
ILIM
S
Q
6 OUT
CLK
R
CS 3
GND 5
CPWM
OSC Q
50% MAX DUTY CYCLE
2R
COMP 1
R
ADV_CLK 2
Figure 3. MAX5071C Functional Diagram
V CC and Startup
In normal operation, V CC is derived from a tertiary wind-
ing of the transformer. However, at startup there is no
energy delivered through the transformer, thus a resistor
must be connected from V CC to the input power source
(see R ST and C ST in Figures 5 to 8). During startup, C ST
charges up through R ST . The 5V reference generator,
comparator, error amplifier, oscillator, and drive circuit
remain off during UVLO to reduce startup current below
65μA. When V CC reaches the undervoltage-lockout
threshold of 16V, the output driver begins to switch and
the tertiary winding will supply power to V CC . V CC has an
internal 26.5V current-limited clamp at its input to protect
the device from overvoltage during startup.
4 R T /C T
Size the startup resistor, R ST , to supply both the maxi-
mum startup bias (I START ) of the device (65μA max)
and the charging current for C ST . The startup capacitor
C ST must charge to 16V within the desired time period
t ST (for example, 500ms). The size of the startup
capacitor depends on:
1) IC operating supply current at a programmed oscilla-
tor frequency (f OSC ).
2) The time required for the bias voltage, derived from
a bias winding, to go from 0 to 11V.
3) The MOSFET total gate charge.
4) The operating frequency of the converter (f SW ).
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5070AAUA | 功能描述:电流型 PWM 控制器 Single-Ended 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 |
| MAX5070AAUA+ | 功能描述:电流型 PWM 控制器 Single-Ended 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 |
| MAX5070AAUA+T | 功能描述:电流型 PWM 控制器 Single-Ended 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 |
| MAX5070AAUA-T | 功能描述:电流型 PWM 控制器 Single-Ended 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 |
| MAX5070BAPA+ | 制造商:Maxim Integrated Products 功能描述:HIGH-PERFORMANCE, SINGLE-ENDED, CURRENT-MODE PWM CONTROLLERS - Rail/Tube |
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