Datasheet > DPA423G

DPA423G

更新时间： 2024-02-10 02:53:26

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		转换器电信开关光电二极管以太网
页数	文件大小	规格书
34页	2832K
描述
Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications

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DPA423G 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：	PLASTIC, MO-169-7C, 6 PIN	针数：	6
Reach Compliance Code：	compliant	风险等级：	5.19
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	Base Number Matches：	1

DPA423G 数据手册

DPA422-426

saturation due to large load transients in forward converter

applications. DC_MAXof 33% at the OV threshold was chosen to

ensure that the power capability of the DPA-Switch is not

restricted by this feature under normal operation.

DPA-Switch is held in remote-off state for longer than 10 µs

(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.

Remote ON/OFF

Remote ON/OFF control describes operation where the IC is

turned on or off for long periods as opposed to the cycle-by-

cycle on/off control, which is described in the Synchronization

section below.

DPA-Switch can be turned on or off by controlling the current

into the LINE-SENSE pin or out from the EXTERNAL CURRENT

LIMIT pin (see Figure 7). This allows easy implementation of

remote ON/OFF control of DPA-Switch in several different ways.

A transistor or an optocoupler output connected between the

EXTERNAL CURRENT LIMIT pin and the SOURCE pin

implements this function with “active-on” (Figures 17, 19 and 21)

while a transistor or an optocoupler output connected between

the LINE-SENSE pin and the CONTROL pin implements the

function with “active-off” (Figures 18, 20 and 22).

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 connected

between the LINE-SENSE pin and the SOURCE pin implements

this function (see Figure 24). Please refer to Figure 6 for the

timing waveforms of synchronization operation.

When a signal is received at the LINE-SENSE pin or the

EXTERNAL CURRENT LIMIT pin to disable the output through

any of the pin functions such as OV, UV and remote ON/OFF,

DPA-Switch always completes its current switching cycle before

the output is forced off. The internal oscillator is stopped at the

end of the current cycle and stays there as long as the disable

signal exists. When the signal at the above pins changes state

from disable to enable, the internal oscillator starts the next

switching cycle.

The remote ON/OFF feature can be used as a standby or power

switch to turn off the DPA-Switch and keep it in a very low

power consumption state for indeﬁnitely long periods. If the

≥ 128 kHz;

£ 7.7 µs; 120 ns £ t

£ 2250 ns for f

£ 3080 ns for f

= 400 kHz

= 300 kHz

SYNC

OFF

OSC

Oscillator

(SAW)

MAX

2 V

0 V

Time

OFF

SYNC

PI-2762-070501

Figure 6. Synchronization Timing Diagram.

www.powerint.com

Rev. T 12/12

1...4 5 678 9 10...34

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DPA423P	POWERINT	Highly Integrated DC-DC Converter ICs for Power over Ethernet & Telecom Applications	获取价格
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