- 您现在的位置：买卖IC网 > PDF目录15489 > MAX5068CAUE+ (Maxim Integrated Products)IC REG CTRLR FLYBK ISO 16-TSSOP PDF资料下载
参数资料
| 型号： | MAX5068CAUE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 96 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.25MHz |
| 占空比： | 75% |
| 电源电压： | 10.8 V ~ 24 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 ~ 125°C |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
High-Frequency, Current-Mode PWM Controller
with Accurate Programmable Oscillator
Use the following formula to calculate the internal oscil-
lator frequency:
External Synchronization
(MAX5068A/B/C/E)
f osc =
10 11
R RT
The MAX5068A/B/C/E can be synchronized using an
external clock at the SYNC input. For proper frequency
synchronization, the SYNC’s input frequency must be at
least 25% higher than the MAX5068A/B/C/E pro-
where f OSC is the oscillator frequency and R RT is a
resistor connected from RT to AGND.
Choose the appropriate resistor at RT to calculate the
desired output switching frequency (f SW ):
grammed internal oscillator frequency. Connect SYNC
to AGND when not using an external clock.
Integrating Fault Protection
The integrating fault-protection feature allows transient
R RT =
R RT =
10 11
2 f SW
10 11
4 f SW
for the MAX 5068 A / B and
for the MAX 5068 C / D / E / F
overcurrent conditions to be ignored for a programma-
ble amount of time, giving the power supply time to
behave like a current source to the load. For example,
this can occur under load current transients when the
control loop requests maximum current to keep the out-
put voltage from going out of regulation. Program the
fault-integration time by connecting an external suitably
The MAX5068A/B and the MAX5068C/D/E/F have pro-
grammable output switching frequencies from 25kHz to
1.25MHz and 12.5kHz to 625kHz, respectively.
Dead-Time Adjustment
The MAX5068 programmable dead-time function
( Figure 7) allows additional flexibility in optimizing mag-
netics design and overcoming parasitic effects. The
MAX5068A/B and the MAX5068C/D/E/F have a maxi-
mum 50% and 75% duty cycle, respectively. In many
applications, the duty cycle of the external MOSFET
may need to be slightly decreased to prevent satura-
tion in the transformer’s primary. The dead time can be
configured from 30ns to 1 / (0.5 x f SW ) when program-
ming the MAX5068. Connect a resistor between DT and
AGND to set the desired dead time using the following
formula:
sized capacitor to the FLTINT. Under sustained over-
current faults, the voltage across this capacitor ramps
up towards the FLTINT shutdown threshold (typically
2.8V). Once the threshold is reached, the power supply
shuts down. A high-value bleed resistor connected in
parallel with the FLTINT capacitor allows it to discharge
towards the restart threshold (typically 1.6V). Once this
threshold is reached, the supply restarts with a new
soft-start cycle.
Note that cycle-by-cycle current limiting is provided at
all times by CS with a threshold of 314mV (typ). The
fault-integration circuit forces a 60μA current onto
FLTINT each time that the current-limit comparator is
tripped (see the Functional Diagram ). Use the following
formula to calculate the value of the capacitor neces-
sary for the desired shutdown time of the circuit:
C FLTINT ? FLTINT SH
Dead time =
60
29 . 4
× R DT ( ns )
I x t
2 . 8 V
where R DT is in k ? and the dead time is in ns.
Connect DT to REG5 to remove the delay and achieve
the MAX5068 maximum duty cycles.
SYNC
MAX5068A/B/C/E
DEAD TIME
NDRV
< 50%
t DT
< 50%
RT
AGND
Figure 7. MAX5068 NDRV Dead-Time Timing Diagram
Figure 8. External Synchronization of the MAX5068A/B/C/E
14
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| VI-JV3-EY-B1 | CONVERTER MOD DC/DC 24V 50W |
| MAX5068FAUE+ | IC REG CTRLR FLYBK ISO 16-TSSOP |
| MAX5014CSA+ | IC REG CTRLR FLYBK ISO PWM 8SOIC |
| VI-J4D-EY-B1 | CONVERTER MOD DC/DC 85V 50W |
| MAX5003CSE+ | IC REG CTRLR FLYBK ISO VM 16SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5068CAUE+ | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM 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 |
| MAX5068CAUE+T | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM 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 |
| MAX5068CAUE-T | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM 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 |
| MAX5068CWP | 制造商:Maxim Integrated Products 功能描述: |
| MAX5068DAUE | 功能描述:电流型 PWM 控制器 High-Frequency Current-Mode PWM 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 |
发布紧急采购，3分钟左右您将得到回复。