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| 型号： | FAN2110EMPX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 10A 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 ~ 19.2 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： | 10A |
| 同步整流器： | 是 |
| 工作温度： | -40°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） |
| 其它名称： | FAN2110EMPXDKR |
Circuit Description
PWM Generation
Refer to Figure 2 for the PWM control mechanism.
FAN2110 uses the summing-mode method of control to
EN
1.35V
generate the PWM pulses. An amplified current-sense
signal is summed with an internally generated ramp and
the combined signal is compared with the output of the
error amplifier to generate the pulse width to drive the
high-side MOSFET. Sensed current from the previous
cycle is used to modulate the output of the summing
block. The output of the summing block is also
FB
2400 CLKs
1.0V
0.8V
0.8V
Fault
Latch
Enable
compared against a voltage threshold set by the R LIM
resistor to limit the inductor current on a cycle-by-cycle
basis. R RAMP resistor helps set the charging current for
the internal ramp and provides input voltage feed-
forward function. The controller facilitates external
compensation for enhanced flexibility.
Initialization
Once V CC exceeds the UVLO threshold and EN is HIGH,
the IC checks for a shorted FB pin before releasing the
internal soft-start ramp (SS).
If the parallel combination of R1 and R BIAS is ≤ 1 K Ω , the
internal SS ramp is not released and the regulator does
not start.
Enable
FAN2110 has an internal pull-up to the enable (EN) pin
so that the IC is enabled once V CC exceeds the UVLO
threshold. Connecting a small capacitor across EN and
AGND delays the rate of voltage rise on the EN pin. The
EN pin also serves for the restart whenever a fault
occurs (refer to the Auto-Restart section) . If the
regulator is enabled externally, the external EN signal
should go HIGH only after V CC is established. For
applications where such sequencing is required,
FAN2110 can be enabled (after the V CC comes up) with
external control, as shown in Figure 30.
SS
3200 CLKs
T0.8
4000 CLKs
T1.0
Figure 31. Soft-Start Timing Diagram
V CC UVLO or toggling the EN pin discharges the internal
SS and resets the IC. In applications where external EN
signal is used, V IN and V CC should be established before
the EN signal comes up to prevent skipping the soft-
start function.
Startup on Pre-Bias
The regulator does not allow the low-side MOSFET to
operate in full synchronous mode until SS reaches 95%
of V REF (~0.76 V). This enables the regulator to startup
on a pre-biased output and ensures that pre-biased
outputs are not discharged during the soft-start cycle.
Protections
The converter output is monitored and protected against
extreme overload, short-circuit, over-voltage, under-
voltage, and over-temperature conditions.
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.
Figure 30. Enabling with External Control
Soft-Start
Once internal SS ramp has charged to 0.8 V (T0.8), the
output voltage is in regulation. Until SS ramp reaches
1.0 V (T1.0), the fault latch is inhibited.
To avoid skipping the soft-start cycle, it is necessary to
apply V IN before V CC reaches its UVLO threshold. Normal
sequence for powering up would be VIN ? VCC ? EN.
Soft-start time is a function of oscillator frequency.
? 2008 Fairchild Semiconductor Corporation
FAN2110 ? Rev. 1.0.4
12
www.fairchildsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FAN2110EMPX_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 |
| FAN2110MPX | 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 |
| FAN2110MPX_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 |
| FAN21SV04 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:TinyBuck? 4A, 24V Single-Input Integrated Synchronous Buck Regulator |
| FAN21SV04_12 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:TinyBucka?￠ 4 A, 24 V Single-Input Integrated Synchronous Buck Regulator |
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