Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

TOP250G- Datasheet(PDF) 6 Page - Power Integrations, Inc.

Part # TOP250G-
Description  TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
Download  52 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TOP250G- Datasheet(HTML) 6 Page - Power Integrations, Inc.

Back Button TOP250G- Datasheet HTML 2Page - Power Integrations, Inc. TOP250G- Datasheet HTML 3Page - Power Integrations, Inc. TOP250G- Datasheet HTML 4Page - Power Integrations, Inc. TOP250G- Datasheet HTML 5Page - Power Integrations, Inc. TOP250G- Datasheet HTML 6Page - Power Integrations, Inc. TOP250G- Datasheet HTML 7Page - Power Integrations, Inc. TOP250G- Datasheet HTML 8Page - Power Integrations, Inc. TOP250G- Datasheet HTML 9Page - Power Integrations, Inc. TOP250G- Datasheet HTML 10Page - Power Integrations, Inc. Next Button
Zoom Inzoom in Zoom Outzoom out
 6 / 52 page
background image
TOP242-250
M
12/04
6
CONTROL (C) Pin Operation
The CONTROL pin is a low impedance node that is capable
of receiving a combined supply and feedback current. During
normal operation, a shunt regulator is used to separate the
feedbacksignalfromthesupplycurrent. CONTROLpinvoltage
V
C is the supply voltage for the control circuitry including the
MOSFET gate driver. An external bypass capacitor closely
connectedbetweentheCONTROLandSOURCEpinsisrequired
tosupplytheinstantaneousgatedrivecurrent. Thetotalamount
of capacitance connected to this pin also sets the auto-restart
timing as well as control loop compensation.
When rectified DC high voltage is applied to the DRAIN
pin during start-up, the MOSFET is initially off, and the
CONTROL pin capacitor is charged through a switched high
voltagecurrentsourceconnectedinternallybetweentheDRAIN
and CONTROL pins. When the CONTROL pin voltage V
C
reaches approximately 5.8 V, the control circuitry is activated
and the soft-start begins. The soft-start circuit gradually
increases the duty cycle of the MOSFET from zero to the
maximum value over approximately 10 ms. If no external
feedback/supply current is fed into the CONTROL pin by the
end of the soft-start, the high voltage current source is turned
off and the CONTROL pin will start discharging in response
to the supply current drawn by the control circuitry. If the
power supply is designed properly, and no fault condition
such as open loop or shorted output exists, the feedback loop
will close, providing external CONTROL pin current, before
the CONTROL pin voltage has had a chance to discharge to
the lower threshold voltage of approximately 4.8 V (internal
supply under-voltage lockout threshold). When the externally
fed current charges the CONTROL pin to the shunt regulator
voltage of 5.8 V, current in excess of the consumption of the
chip is shunted to SOURCE through resistor R
E as shown in
Figure2. ThiscurrentflowingthroughR
E controls the duty cycle
of the power MOSFET to provide closed loop regulation. The
shunt regulator has a finite low output impedance Z
C that sets
the gain of the error amplifier when used in a primary feedback
configuration. The dynamic impedance Z
C of the CONTROL
pin together with the external CONTROL pin capacitance sets
the dominant pole for the control loop.
When a fault condition such as an open loop or shorted output
prevents the flow of an external current into the CONTROL
pin, the capacitor on the CONTROL pin discharges towards
4.8 V. At 4.8 V, auto-restart is activated which turns the output
MOSFET off and puts the control circuitry in a low current
standby mode. The high-voltage current source turns on and
charges the external capacitance again. A hysteretic internal
supply under-voltage comparator keeps V
C within a window
of typically 4.8 V to 5.8 V by turning the high-voltage current
source on and off as shown in Figure 8. The auto-restart
circuit has a divide-by-eight counter which prevents the output
MOSFET from turning on again until eight discharge/charge
cycles have elapsed. This is accomplished by enabling the
outputMOSFETonlywhenthedivide-by-eightcounterreaches
full count (S7). The counter effectively limits TOPSwitch-GX
power dissipation by reducing the auto-restart duty cycle
to typically 4%. Auto-restart mode continues until output
voltage regulation is again achieved through closure of the
feedback loop.
Oscillator and Switching Frequency
The internal oscillator linearly charges and discharges an
PI-2545-082299
S1
S2
S6
S7
S1
S2
S6
S7
S0
S1
S7
S0
S0
5.8 V
4.8 V
S7
0 V
0 V
0 V
VLINE
VC
VDRAIN
VOUT
Note: S0 through S7 are the output states of the auto-restart counter
2
1
2
3
4
0 V
S6
S7
VUV
S2
Figure 8. Typical Waveforms for (1) Power Up (2) Normal Operation (3) Auto-Restart (4) Power Down.


Similar Part No. - TOP250G-

ManufacturerPart #DatasheetDescription
logo
Power Integrations, Inc...
TOP250 POWERINT-TOP250 Datasheet
449Kb / 52P
   TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
logo
Guangdong Kexin Industr...
TOP250 KEXIN-TOP250 Datasheet
298Kb / 6P
   TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart,Integrated Off-line Switcher
logo
Power Integrations, Inc...
TOP250 POWERINT-TOP250 Datasheet
3Mb / 54P
   Extended Power, Design Flexible, EcoSmart, Integrated Off-Line Switcher
October 2020
TOP250F POWERINT-TOP250F Datasheet
449Kb / 52P
   TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP250F POWERINT-TOP250F Datasheet
2Mb / 52P
   Extended Power, Design Flexible EcoSmart, Integrated Off-line Switcher
More results

Similar Description - TOP250G-

ManufacturerPart #DatasheetDescription
logo
Guangdong Kexin Industr...
TOP250 KEXIN-TOP250 Datasheet
298Kb / 6P
   TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart,Integrated Off-line Switcher
logo
Power Integrations, Inc...
TOP250 POWERINT-TOP250 Datasheet
449Kb / 52P
   TOPSwitch -GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP242 POWERINT-TOP242_V01 Datasheet
3Mb / 54P
   Extended Power, Design Flexible, EcoSmart, Integrated Off-Line Switcher
October 2020
TOP242 POWERINT-TOP242 Datasheet
2Mb / 52P
   Extended Power, Design Flexible EcoSmart, Integrated Off-line Switcher
TOP242-249 POWERINT-TOP242-249 Datasheet
771Kb / 48P
   Family Extended Power, Design Flexible,Integrated Off-line Switcher
TOP232 POWERINT-TOP232 Datasheet
3Mb / 38P
   Design Flexible, EcoSmart, Integrated Off-Line Switcher
October 2020
TOP232PN POWERINT-TOP232PN Datasheet
644Kb / 36P
   Design Flexible, EcoSmart, Integrated Off-line Switcher
TOP234PN POWERINT-TOP234PN Datasheet
644Kb / 36P
   Design Flexible, EcoSmart, Integrated Off-line Switcher
logo
Power Analog Micoelectr...
TOP232PN PAM-TOP232PN Datasheet
644Kb / 36P
   TOPSwitch-FX Family Design Flexible, EcoSmart짰, Integrated Off-line Switcher
logo
Power Integrations, Inc...
TOP234G-TL POWERINT-TOP234G-TL Datasheet
644Kb / 36P
   Design Flexible, EcoSmart® , Integrated Off-line Switcher
July 2001
More results


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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   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
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com