Electronic Components Datasheet Search
  English  ▼

Delete All


Preview PDF HTML

HA17384SPS Datasheet(PDF) 28 Page - Hitachi Semiconductor

Part No. HA17384SPS
Description  High Speed Current Mode PWM Control IC for Switching Power Supply
Download  31 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng

HA17384SPS Datasheet(HTML) 28 Page - Hitachi Semiconductor

Zoom Inzoom in Zoom Outzoom out
 28 / 31 page
background image
Notice for Use
1. OVP Latch Block
• Case
When DC power is applied directly as the power supply of the HA17384H, HA17385H, without using
the transformer backup coil. Also, when high-frequency noise is superimposed on the V
IN pin.
• Problem
The IC may not be turn on in the case of a circuit in which V
IN rises quickly (10 V/100 µs or faster),
such as that shown in figure 16. Also, the OVP latch may operate even though the FB pin is normally at
OVP or below after the IC is activated.
• Reason
Because of the IC circuit configuration, the timer latch block operates first.
• Remedy (counter measure)
Take remedial action such as configuring a time constant circuit (R
B, CB) as shown in figure 17, to keep
the V
IN rise speed below 10 V/100 µs. Also, if there is marked high-frequency noise on the VIN pin, a
noise cancellation capacitor (C
N) with the best possible high-frequency characteristics (such as a
ceramic capacitor) should be inserted between the V
IN pin and GND, and close to the VIN pin.
When configuring an IC power supply with an activation resistance and backup winding, such as an
AC/DC converter, the rise of V
IN will normally be around 1 V/100 µs, and there is no risk of this problem
occurring, but careful attention must be paid to high-frequency noise.
Also, this phenomenon is not occuring to the HA17384S, because OVP function is not built-in.
Figure 16 Example of Circuit with Fast V
IN Rise Time

Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31 

Datasheet Download

Link URL

Privacy Policy
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com

Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn