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参数资料
| 型号： | FAN2108MPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 8A 25MLP |
| 标准包装： | 1 |
| 系列： | TinyBuck™ |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 19 V |
| 输入电压： | 3 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 600kHz |
| 电流 - 输出： | 8A |
| 同步整流器： | 是 |
| 工作温度： | -10°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 25-MLP |
| 包装： | 标准包装 |
| 供应商设备封装： | 25-MLP（5x6） |
| 产品目录页面： | 1214 (CN2011-ZH PDF) |
| 其它名称： | FAN2108MPXDKR |
The converter output is monitored and protected against
extreme overload, short-circuit, over-voltage, under-
voltage, and over-temperature conditions.
An internal fault latch is set for any fault intended to shut
down the IC. When the fault latch is set, the IC
discharges V OUT by enhancing the low-side MOSFET
to keep the 1 μA current sink from discharging EN to
1.1 V. Figure 24 shows one method to pull up EN to V CC
for a latch configuration.
15 VCC
until FB<0.25 V. The MOSFET is not turned on again
unless FB>0.5 V. This behavior discharges the output
without causing undershoot (negative output voltage).
Under-Voltage Shutdown
If voltage on the FB pin remains below the under-voltage
threshold for 16 consecutive clock cycles, the fault latch
is set and the converter shuts down. This protection is
not active until the internal SS ramp reaches 1.0 V
during soft-start.
100K
FAN2108
14 EN
3.3n
Over-Voltage Protection / Shutdown
Figure 24.
Enable Control with Latch Option
If voltage on the FB pin exceeds the over-voltage
threshold for two consecutive clock cycles, the fault latch
is set and shutdown occurs.
A shorted high-side MOSFET condition is detected
when SW voltage exceeds ~0.7 V while the low-side
MOSFET is fully enhanced. The fault latch is set
immediately upon detection.
The two fault protection circuits above are active all the
time, including during soft-start.
Auto-Restart
After a fault, EN pin is discharged by a 1 μA current sink
to a 1.1 V threshold before the internal 800 K Ω pull-up is
restored. A new soft-start cycle begins when EN
charges above 1.35 V.
Depending on the external circuit, the FAN2108 can be
configured to remain latched-off or to automatically
restart after a fault.
Table 1. Fault / Restart Configurations
Over-Temperature Protection (OTP)
The chip incorporates an over-temperature protection
circuit that sets the fault latch when a die temperature of
about 150°C is reached. The IC restarts when the die
temperature falls below 125°C.
Power-Good (PGOOD) Signal
PGOOD is an open-drain output that asserts LOW when
V OUT is out of regulation, as measured at the FB pin.
Thresholds are specified in the Electrical Specifications
section. PGOOD does not assert HIGH until the fault
latch is enabled (T1.0).
PCB Layout
EN Pin
Pull to GND
Pull-up to V CC with
100K
Open
Cap. to GND
Controller / Restart State
OFF (Disabled)
No Restart – Latched OFF(After
V CC Comes Up)
Immediate Restart After Fault
New Soft-Start Cycle After:
t DELAY (ms)=3.9 ? C(nf)
With EN is left open, restart is immediate.
If auto-restart is not desired, tie the EN pin to the VCC
pin or pull it HIGH after V CC comes up with a logic gate
? 2008 Fairchild Semiconductor Corporation
FAN2108 ? Rev. 1.0.2
12
Figure 25. Recommended PCB Layout
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2108MPX_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:TinyBucka?￠ 3-24 V Input, 8 A, High-Efficiency, Integrated Synchronous Buck Regulator |
| FAN2108MPX_SN00233 | 功能描述:DC/DC 开关控制器 600KHz 3.2V 8A RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| FAN2110 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:TinyBuck?, 3-24V Input, 10A, High-Efficiency, Integrated Synchronous Buck Regulator |
| FAN2110_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:TinyBucka?￠, 3-24 V Input, 10 A, High- Efficiency, Integrated Synchronous Buck Regulator |
| FAN2110EMPX | 功能描述:开关变换器、稳压器与控制器 TinyBuck 3-24VIn/10A Hi-Eff Int Sync Reg RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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