Datasheet > DPA425P-TL

DPA425P-TL

更新时间： 2024-02-23 04:16:42

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		转换器
页数	文件大小	规格书
36页	289K
描述
Highly Integrated DC-DC Converter ICs for Distributed Power Architectures

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DPA425P-TL 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	SFM
包装说明：	,	针数：	6
Reach Compliance Code：	compliant	风险等级：	5.32
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：	40 V
JESD-30 代码：	R-PSSO-G6	JESD-609代码：	e0
长度：	9.4 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：	1.75 A
封装主体材料：	PLASTIC/EPOXY	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	座面最大高度：	2.054 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 (Sn/Pb)
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：	NOT SPECIFIED
宽度：	8 mm

DPA425P-TL 数据手册

DPA423-426

(typical), the CONTROL pin goes into the hysteretic mode of

operation. In this mode, the CONTROL pin goes through

alternate charge and discharge cycles between 4.8 V and 5.8 V

(see CONTROL Pin Operation section above) and the IC runs

entirely off the high voltage DC input, but with very low power

consumption (30 mW typical at 48 V with LINE-SENSE and

EXTERNAL CURRENT LIMIT pins open). When the

DPA-Switch is remotely turned on after entering this mode, it

will initiate a normal start-up sequence with soft-start the next

time the CONTROL pin reaches 5.8 V. In the worst case, the

delay from remote on to start-up can be equal to the full

discharge/charge cycle time of the CONTROL pin, which is

approximately 36 ms for a 22 µF CONTROL pin capacitor.

This reduced-consumption remote-off mode can eliminate

expensive and unreliable in-line mechanical switches. It also

allows for microprocessor-controlled turn-on and turn-off

sequences that may be required in certain applications.

hysteretic regulation of CONTROL pin voltage (V_C), due to

remote off or thermal shutdown conditions. This effectively

minimizescurrentandvoltagestressesontheoutputMOSFET,

the clamp circuit and the output rectifier during start-up. This

feature also helps minimize output overshoot and prevents

saturation of the transformer during start-up.

Shutdown/Auto-Restart

To minimize DPA-Switch power dissipation under fault

conditions, the shutdown/auto-restart circuit turns the power

supply on and off at an auto-restart duty cycle of typically 4%

if an out of regulation condition persists. Loss of regulation

interrupts the external current into the CONTROL pin. V_C

regulation changes from shunt mode to the hysteretic auto-

restart mode as described in CONTROL pin operation section.

When the fault condition is removed, the power supply output

becomes regulated, V_Cregulation returns to shunt mode, and

normal operation of the power supply resumes.

Synchronization

In addition to sensing incoming current for OV, UV and remote

ON/OFF, the LINE-SENSE pin also monitors its pin voltage

through a 1 V threshold comparator. A pin voltage below 1 V

turns on DPA-Switch. When the voltage at LINE-SENSE pin

rises beyond 1 V to disable the output, DPA-Switch completes

its current switching cycle before the output is forced off

(similar to remote ON/OFF operation). The internal oscillator

is stopped at the end of the current cycle awaiting the

LINE-SENSE pin voltage to go low to start the next cycle. This

allows the use of the 1 V threshold to synchronize DPA-Switch

to an external signal with a frequency lower than its internal

switching frequency. A transistor or an optocoupler output

connectedbetweentheLINE-SENSEpinandtheSOURCEpin

implements this function (see Figure 24). Please refer to

Figure6forthetimingwaveformsofsynchronizationoperation.

Hysteretic Over-Temperature Protection

Over temperature protection is provided by a precision analog

circuit that turns the output MOSFET off when the junction

temperature exceeds the thermal shutdown temperature

(137 °C typical). When the junction temperature cools to below

the hysteretic temperature (110 °C typical), normal operation

resumes providing automatic recovery. V_Cis regulated in

hysteretic mode and a 4.8 V to 5.8 V (typical) sawtooth

waveform is present on the CONTROL pin while in thermal

shutdown.

Bandgap Reference

All critical DPA-Switch internal voltages are derived from a

temperature-compensated bandgap reference. This reference is

also used to generate a temperature-compensated current

reference that is trimmed to accurately set the switching

frequency, current limit, and the line OV/UV thresholds.

DPA-Switchhas improved circuitry to maintain all of the above

critical parameters within very tight absolute and temperature

tolerances.

In order to be recognized as a synchronization pulse, the

LINE-SENSE pin needs to stay low (on-time) for at least

120 ns but no more than 2250 ns for 400 kHz (or 3080 ns for

300kHz)internalswitchingfrequency.Inaddition,theoff-time

mustbekeptbelow7.7µswhichisalimitationsetbythelowest

synchronizationfrequencyof128kHzallowedbythechip. The

effectiveDC_MAXforsynchronizationoperationcanbecalculated

as0.75xf_SYNC/f_OSC. Anoff-timelongerthan7.7µsmayforcethe

CONTROLpintogointothehystereticmodeandinitiateasoft-

start cycle at next turn-on.

High-Voltage Bias Current Source

This current source biases DPA-Switch from the DRAIN pin

and charges the CONTROL pin external capacitance during

start-up or hysteretic operation. Hysteretic operation occurs

duringauto-restart,remoteoffandover-temperatureshutdown.

In this mode of operation, the current source is switched on and

off with an effective duty cycle of approximately 20%. This

duty cycle is determined by the ratio of CONTROL pin charge

(I_C(CH)) and discharge currents (I_CD1and I_CD2). This current

source is turned off during normal operation when the output

MOSFETisswitching.Theeffectofthecurrentsourceswitching

may be seen on the DRAIN voltage waveform as small

disturbances which is normal.

Soft-Start

Two on-chip soft-start functions are activated at start-up with a

duration of 5 ms (typical). Maximum duty cycle starts from 0%

andlinearlyincreasestothedefaultmaximumof75%attheend

of the 5 ms duration and the current limit starts from about 85%

and linearly increases to 100% at the end of the 5 ms duration.

In addition to start-up, soft-start is also activated at each restart

attempt during auto-restart and when restarting after being in

1/04

1...5 6 789 10 11...36

中文翻译

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