Datasheet > DPA422GN

DPA422GN

更新时间： 2024-01-24 18:59:26

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
20页	1071K
描述
DPA-Switch DC-DC Forward Converter Design Guide

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DPA422GN 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	D2PAK	包装说明：	TO-263, 7/6 PIN
针数：	4	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.87	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
最大输入电压：	75 V	最小输入电压：	16 V
标称输入电压：	35 V	JESD-30 代码：	R-PSSO-G6
JESD-609代码：	e0	长度：	10.29 mm
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：	1.31 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	TO-263	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	225
认证状态：	Not Qualified	座面最大高度：	4.95 mm
表面贴装：	YES	切换器配置：	SINGLE
最大切换频率：	425 kHz	技术：	CMOS
温度等级：	AUTOMOTIVE	端子面层：	TIN LEAD
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	SINGLE	处于峰值回流温度下的最长时间：	30
宽度：	8.405 mm	Base Number Matches：	1

DPA422GN 数据手册

AN-31

Ifpowerdissipationisaproblemwiththesmallestdevice,select

the next larger device and program the current limit with the

X pin to 10% above the peak primary current. This is done to

limit overload power capability. Refer to the DPA-Switch data

sheet to determine the value of the resistor on the X pin that

corresponds to the desired current limit.

need for this clamp capacitor. Bench tests will determine

whether the capacitor is required to maintain safe drain-to-

source voltages. In normal steady-state operation, the capacitor

C_CPacross the primary of the transformer absorbs energy from

leakage inductance to keep the drain-to-source voltage below

the Zener voltage. There is an optimum value for C_CPthat

typically ranges between 10 pF and 100 pF for converters in

the range of 10 W to 40 W.

Figure 3 illustrates how the efﬁciency is related to the selection

of the DPA-Switch. Devices with lower R_DS(ON)dissipate less

power where resistive voltage drop dominates the loss. Thus,

the efﬁciency is higher for larger devices at low input voltage.

At higher input voltages the RMS current in the DPA-Switch

decreases and the loss from capacitance on the drain increases,

so the lower R_DS(ON)has virtually no effect on efﬁciency.

The value of C_CPdepends on the leakage inductance and the

peak current. The proper value of capacitance will allow most

of the energy in the leakage inductance to be recovered during

the next switching cycle. Too little capacitance will cause the

Zener diode to conduct. Dissipation in the Zener will reduce

efﬁciency. Too much capacitance will also reduce efﬁciency

because it will increase turn-on losses in the DPA-Switch and

may also interfere with the reset of the transformer.

Clamp Circuit

All applications must protect the DPA-Switch from excessive

drain voltage. Figure 1 shows a simple and effective solution.

A Zener diode from the drain to source provides a hard clamp.

The 30 W prototype example (Table 1), uses a 150 V Zener to

guarantee substantial margin from the breakdown voltage of

220 V. A small capacitor across the primary of the transformer

may be necessary in conjunction with the Zener clamp (see

Figure 4).

The Zener diode does not conduct during normal steady-state

operation, but it is required to limit the drain voltage during

start-up, transient loading and overload conditions.

At higher powers, the clamp capacitor value (C_CP), becomes a

limiting factor on the efﬁciency of the power supply. Different

techniques can be used for these higher power applications

(above approximately 40 W). Figures 5 and 6 show a non-

dissipative clamp technique that also resets the transformer.

See references [4] and [5] for a description of this technique.

The designer should put a placeholder for this capacitor on

the initial prototype. In some designs there is sufﬁcient stray

capacitance on the primary of the transformer to remove the

Transformer Reset Circuit

The ﬂux in the magnetizing inductance of the transformer

must be reset in each switching cycle to maintain volt-seconds

C_SR_S

DC INPUT

C_CP

DPA-Switch

Input

V_DS

Voltage

CONTROL

VR1

CONTROL

V₁

DPA-Switch

DC INPUT

PI-3474-032603

PI-2875-062204

Figure 4. Components of the Transformer Clamp and Reset Circuit.

Figure 4. LC (Inductor Capacitor) Reset and Clamp.

7/04

1...4 5 678 9 10...20

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