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參數(shù)資料
| 型號(hào)： | FAN5331SX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 1.6MHz Boost Converter with 20V Integrated FET Switch |
| 中文描述： | 1 A SWITCHING REGULATOR, 1850 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 214K |
| 代理商： | FAN5331SX |
6
www.fairchildsemi.com
FAN5331 Rev. 1.0.1
F
Block Diagram
Figure 4. Block Diagram
Circuit Description
The FAN5331 is a pulse-width modulated (PWM) current-mode
boost converter. The FAN5331 improves the performance of bat-
tery powered equipment by significantly minimizing the spectral
distribution of noise at the input caused by the switching action of
the regulator. In order to facilitate effective noise filtering, the
switching frequency was chosen to be high, 1.6MHz. An internal
soft start circuitry minimizes in-rush currents. The timing of the soft
start circuit was chosen to reach 95% of the nominal output voltage
within maximum 5mS following an enable command when V
IN
=
2.7V, V
OUT
= 15V, I
LOAD
= 35mA and C
OUT (EFFECTIVE)
= 3.2
μ
F.
The device architecture is that of a current mode controller with
an internal sense resistor connected in series with the N-chan-
nel switch. The voltage at the feedback pin tracks the output
voltage at the cathode of the external Schottky diode (shown in
the test circuit). The error amplifier amplifies the difference
between the feedback voltage and the internal bandgap refer-
ence. The amplified error voltage serves as a reference voltage
to the PWM comparator. The inverting input of the PWM com-
parator consists of the sum of two components: the amplified
control signal received from the 50m
current sense resistor
and the ramp generator voltage derived from the oscillator. The
oscillator sets the latch, and the latch turns on the FET switch.
Under normal operating conditions, the PWM comparator resets
the latch and turns off the FET, thus terminating the pulse. Since
the comparator input contains information about the output volt-
age and the control loop is arranged to form a negative feed-
back loop, the value of the peak inductor current will be adjusted
to maintain regulation.
Every time the latch is reset, the FET is turned off and the cur-
rent flow through the switch is terminated. The latch can be
reset by other events as well. Over-current condition is moni-
tored by the current limit comparator which resets the latch and
turns off the switch instantaneously within each clock cycle.
Over-voltage condition is detected by a fast comparator limiting
the duty cycle in a similar manner to over-current monitoring
described above.
Applications Information
Setting the Output Voltage
The internal reference is 1.23V (Typical). The output voltage is
divided by a resistor divider, R1 and R2 to the FB pin. The out-
put voltage is given by
According to this equation, and assuming desired output volt-
age of 15V, good choices for the feedback resistors are,
R
1
=150k
and R
2
=13.4k
.
Inductor Selection
The inductor parameters directly related to device performances
are saturation current and dc resistance. The FAN5331 oper-
ates with a typical inductor value of 10μH. The lower the dc
resistance, the higher the efficiency. Usually a trade-off between
inductor size, cost and overall efficiency is needed to make the
optimum choice.
The inductor saturation current should be rated around 1A,
which is the threshold of the internal current limit circuit. This
limit is reached only during the start-up and with heavy load
condition; when this event occurs the converter can shift over in
Reference
Oscillator
n
FB
FB
Driver
Comp
-
Comp
-
-
+
+
S
Ramp
Generator
R
R
R
Q
S
Current Limit
Comparator
0.05
1.15 x V
REF
Shutdown
Circuitry
Thermal
Shutdown
SHDN
4
GND
SW
1
V
IN
5
Amp
Error
+
2
3
+
-
+
-
Soft-Start
V
OUT
V
REF
1
R
1
R
2
------
+
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5331SX_Q | 功能描述:IC LED DRVR WHITE BCKLGT SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - LED 驅(qū)動(dòng)器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 恒定電流:- 恒定電壓:- 拓?fù)?PWM，切換式電容器（充電泵） 輸出數(shù):1 內(nèi)部驅(qū)動(dòng)器:是 類(lèi)型 - 主要:背光 類(lèi)型 - 次要:白色 LED 頻率:642kHz 電源電壓:2.7 V ~ 5.5 V 輸出電壓:5V 安裝類(lèi)型:表面貼裝 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:10-VSON 包裝:剪切帶 (CT) 工作溫度:-30°C ~ 85°C 產(chǎn)品目錄頁(yè)面:1371 (CN2011-ZH PDF) 其它名稱:BD1603NUV-E2CT |
| FAN5332_BBC3086B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5332A | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High Efficiency, High Current Serial LED Driver and OLED Supply with 30V Integrated Switch |
| FAN5332ASX | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 1.6MHz BOOST REGULATOR RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| FAN5332ASX_NL | 功能描述:LED照明驅(qū)動(dòng)器 1.6MHz Boost regulator RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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