ＦＴ０２１Ｆ是一款高集成度高电压输入同步降压ＤＣ－ＤＣ。
该ＦＴ０２１Ｆ ＤＣ－ＤＣ转换器 封装体积为ＳＯＰ－８ＬＦＴ０２１Ｆ ＰＣＢＡ版上外部极少元器件
ＦＴ０２１Ｆ 能提供输出可调１Ａ－２．５Ａ电流，输入工作电压范围１０Ｖ至３０Ｖ，ＦＴ０２１Ｆ内置输出电压补偿宽输入电压范围：１０－３０Ｖ
描述
具有优异的负载和线路调整开关频率可调１００ｋＨｚ至５００ｋＨｚ频率同步体系结构提供了高效率的设计
receptionist
电流模式能提供快速瞬态响应和简化环路稳定性其他功能还包括电压补偿，可调制电流限制和热关断保护
高达９３％的效率
简体字翻译繁体字可编程开关频率高达高达５００ｋＨｚ无环路补偿可编程电流限制电缆补偿从０到０．６热关断
产品特点
车载充电器／适配器
预调节的线性稳压器分布式电源系统电池充电器
产品应用
考验智商的电影TOP VIEW
S/W
宵夜英文
dilf
dominate什么意思
* The output voltage is t by R2 and R3: V OUT = 1.21V • [1 + (R2/R3)].
P i n A s s i g n m e n t a n d D e s c r i p t i o n
A b s o l u t e M a x i m u m R a t i n g s(N o t e1)
Input Supply Voltage ....................................................................................................-0.3V ～ 35V FB, ILIM, . -0.3V ～ 6V S
W Voltage ........................................................................................................-0.3V ～(VIN + 1V) Operating Temperature Range (Note 2).........................................................-40℃～ +85℃ Storage -65℃～ +150℃ Junction Temperature Range.. (150)
Lead Temperature (Soldering, 10 c.) (265)
PIN NAME DESCRIPTION
1 FB Feedback
2 RT Frequency
Setting
3 ILIM Current
Limit
4 VIN Input
Supply
Voltage
5, 6 SW Switch Node
7, 8 GND Ground
该ＦＴ０２１Ｆ是保证符合性能规格为０度－７０度，在－４０至＋８５度工作温度范围内放心
注１：
超出所列的绝对最大额定值强调可能会造成永久性损坏设备。
于任何绝对最大额定值长时间状态可能会影响器件的可靠性和寿命。
注２：
通过设计，表征和相关的统计过程控制。
150
10
FT021F
E
l e c t r i c a l C h a r a c t e r i s t i c s
Operating Conditions: T A =25, V ℃IN =12V, R2=470k, R3=150k, unless otherwi specified. SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS V IN
Operating Voltage Range
10
30
V
I Q Quiescent Current I LOAD =0A 10 15 20 mA I SHDN Shutdown Current 110 150 μA
V UVLO
Input UVLO Threshold
fall guy4.25 4.5 V
ΔV UVLO UVLO Hysteresis 50 100 mV V FB Regulated Voltage 1.188 1.21 1.236 V I FB Feedback Pin Input Current
0.05 μA
f OSC Oscillator Frequency Range
100 500 kHz
R T =100k 180 220 260 kHz DC Max Duty Cycle
100
%
I LIM-TH Current Limit Sen Pin
Source Current
7 8.5 10 μA
R PFET R DS(ON) of P-Channel FET 65 m Ω
R NFET R DS(ON) of N-Channel FET 30 m Ω T SD Thermal Shutdown Temperature Rising
150 ℃
ΔT SD
Thermal Shutdown Hysteresis
bevel30 ℃
T
y p i c a l P e r f o r m a n c e C h a r a c t e r i s t i c s
Operating Conditions: T A =25℃, C IN =47μF, C OUT =100μF, L=10μH, unless otherwi noted.
superiorto
Vin=24V
Vin=12V
英孚口语
P
i n F u n c t i o n s
FB (Pin 1): Feedback Pin. Receive the feedback voltage from an external resistive divider across the output. In the adjustable version, the output voltage is fixed. The Output voltage is t by R2 and R3: V OUT = 1.21V • [1 + (R2/R3)].
RT (Pin 2): The internal oscillator is t with a single resistor between this pin and the GND pin. ILIM (Pin 3): Monitors current through the low-side switch and triggers current limit operation if the inductor valley current exceeds a ur defined value that is t by R LIM and the Sen current sourced out of this pin during operation.
VIN (Pin 4): 10V to 30V unregulated input. It must be
cloly decoupled to GND, with a 47μF or greater ceramic capacitor to prevent large voltage spikes
from appearing at the input.
SW (Pin 5, 6): Switch Node Connection to Inductor. GND (Pin 7, 8): Ground Pin.
B l o c k D i a g r a m
Main Supply Pin. The FT021F operates from
