Datasheet > TOP244YN

TOP244YN

更新时间： 2025-07-19 22:54:31

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		局域网开关
页数	文件大小	规格书
52页	2220K
描述
IC OFFLINE SWIT UVLO HV TO220

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TOP244YN 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Not Recommended	零件包装代码：	SFM
包装说明：	ZIP, ZIP6,.27,.06,100/50TB	针数：	3
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	14 weeks
风险等级：	7.74	其他特性：	REQUIRES AN AC SUPPLY OF 85 TO 265 V
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	JESD-30 代码：	R-PZFM-T6
JESD-609代码：	e3	功能数量：	1
端子数量：	6	最高工作温度：	125 °C
最低工作温度：	-40 °C	最大输出电流：	2.16 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	ZIP
封装等效代码：	ZIP6,.27,.06,100/50TB	封装形状：	RECTANGULAR
封装形式：	FLANGE MOUNT	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	子类别：	Switching Regulator or Controllers
表面贴装：	NO	切换器配置：	SINGLE
最大切换频率：	140 kHz	技术：	CMOS
温度等级：	AUTOMOTIVE	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	端子节距：	1.27 mm
端子位置：	ZIG-ZAG	处于峰值回流温度下的最长时间：	NOT SPECIFIED
Base Number Matches：	1

TOP244YN 数据手册

TOP242-250

internal capacitance between two voltage levels to create

a sawtooth waveform for the pulse width modulator. This

oscillator sets the pulse width modulator/current limit latch at

the beginning of each cycle.

136 kHz

Switching

Frequency

128 kHz

The nominal switching frequency of 132 kHz was chosen to

minimize transformer size while keeping the fundamental EMI

frequency below 150 kHz. The FREQUENCY pin (available

only inY, R or F package), when shorted to the CONTROLpin,

lowerstheswitchingfrequencyto66kHz(halffrequency)which

may be preferable in some cases such as noise sensitive video

applications or a high efﬁciency standby mode. Otherwise, the

FREQUENCY pin should be connected to the SOURCE pin

for the default 132 kHz.

4 ms

V_DRAIN

Time

Figure 9. Switching Frequency Jitter (Idealized V_DRAINWaveforms).

To further reduce the EMI level, the switching frequency is

jittered (frequency modulated) by approximately ±4 kHz at

250 Hz (typical) rate as shown in Figure 9. Figure 46 shows

the typical improvement of EMI measurements with frequency

jitter.

frequency is also reduced linearly until a minimum frequency

is reached at a duty cycle of 0% (refer to Figure 7). The

minimum frequency is typically 30 kHz and 15 kHz for

132 kHz and 66 kHz operation, respectively.

This feature allows a power supply to operate at lower

frequency at light loads thus lowering the switching losses

while maintaining good cross regulation performance and low

output ripple.

Pulse Width Modulator and Maximum Duty Cycle

The pulse width modulator implements voltage mode control

by driving the output MOSFET with a duty cycle inversely

proportional to the current into the CONTROL pin that

is in excess of the internal supply current of the chip (see

Figure 7). The excess current is the feedback error signal that

appearsacrossR_E(seeFigure2). ThissignalisﬁlteredbyanRC

network with a typical corner frequency of 7 kHz to reduce the

effect of switching noise in the chip supply current generated

by the MOSFET gate driver. The ﬁltered error signal is

compared with the internal oscillator sawtooth waveform to

generate the duty cycle waveform. As the control current

increases, the duty cycle decreases. A clock signal from the

oscillator sets a latch which turns on the output MOSFET. The

pulse width modulator resets the latch, turning off the output

MOSFET. Note that a minimum current must be driven into

the CONTROL pin before the duty cycle begins to change.

Error Ampliﬁer

The shunt regulator can also perform the function of an error

ampliﬁer in primary side feedback applications. The shunt

regulator voltage is accurately derived from a temperature-

compensated bandgap reference. The gain of the error

ampliﬁer is set by the CONTROL pin dynamic impedance.

The CONTROL pin clamps external circuit signals to the V_C

voltage level. The CONTROL pin current in excess of the

supply current is separated by the shunt regulator and ﬂows

through R_Eas a voltage error signal.

On-Chip Current Limit with External Programmability

The cycle-by-cycle peak drain current limit circuit uses the

output MOSFET ON-resistance as a sense resistor. A current

limit comparator compares the output MOSFET on-state drain

to source voltage, V_DS(ON)with a threshold voltage. High drain

current causes V_DS(ON)to exceed the threshold voltage and turns

the output MOSFET off until the start of the next clock cycle.

The current limit comparator threshold voltage is temperature

compensated to minimize the variation of the current limit due

totemperaturerelatedchangesin R_DS(ON)oftheoutputMOSFET.

The default current limit of TOPSwitch-GX is preset internally.

However, with a resistor connected between EXTERNAL

CURRENT LIMIT (X) pin (Y, R or F package) or MULTI-

FUNCTION (M) pin (P or G package) and SOURCE pin,

current limit can be programmed externally to a lower level

between 30% and 100% of the default current limit. Please

refer to the graphs in the typical performance characteristics

section for the selection of the resistor value. By setting current

limit low, a larger TOPSwitch-GX than necessary for the power

The maximum duty cycle, DC_MAX,is set at a default maximum

value of 78% (typical). However, by connecting the LINE-

SENSE or MULTI-FUNCTION pin (depending on the

package) to the rectiﬁed DC high voltage bus through a

resistor with appropriate value, the maximum duty cycle can

be made to decrease from 78% to 38% (typical) as shown in

Figure 11 when input line voltage increases (see line feed

forward with DC_MAXreduction).

Light Load Frequency Reduction

The pulse width modulator duty cycle reduces as the load at

the power supply output decreases. This reduction in duty

cycle is proportional to the current ﬂowing into the CONTROL

pin. As the CONTROL pin current increases, the duty cycle

decreases linearly towards a duty cycle of 10%. Below 10%

duty cycle, to maintain high efﬁciency at light loads, the

11/05

1...4 5 678 9 10...52

中文翻译

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TOP244YN 替代型号

型号	品牌	替代类型	描述	数据表
KA5M0380RTU	FAIRCHILD	功能相似	Fairchild Power Switch(FPS)
TOP224YN	POWERINT	功能相似	Three-terminal Off-line PWM Switch

与TOP244YN相关器件

型号	品牌	获取价格	描述	数据表
TOP244YN-	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP244YN-TL	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP245	POWERINT	获取价格	Extended Power, Design Flexible EcoSmart, Integrated Off-line Switcher
TOP245F	POWERINT	获取价格	TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switch
TOP245F-	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP245F-TL	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP245FN	POWERINT	获取价格	IC OFFLINE SWIT UVLO HV TO262
TOP245FN-	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP245FN-TL	POWERINT	获取价格	TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switche
TOP245G	POWERINT	获取价格	Extended Power, Design Flexible EcoSmart, Integrated Off-line Switcher

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