Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

CS51031GDR8 Scheda tecnica(PDF) 5 Page - ON Semiconductor

Il numero della parte CS51031GDR8
Spiegazioni elettronici  Fast P?묬h FET Buck Controller
Download  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CS51031GDR8 Scheda tecnica(HTML) 5 Page - ON Semiconductor

  CS51031GDR8 Datasheet HTML 1Page - ON Semiconductor CS51031GDR8 Datasheet HTML 2Page - ON Semiconductor CS51031GDR8 Datasheet HTML 3Page - ON Semiconductor CS51031GDR8 Datasheet HTML 4Page - ON Semiconductor CS51031GDR8 Datasheet HTML 5Page - ON Semiconductor CS51031GDR8 Datasheet HTML 6Page - ON Semiconductor CS51031GDR8 Datasheet HTML 7Page - ON Semiconductor CS51031GDR8 Datasheet HTML 8Page - ON Semiconductor CS51031GDR8 Datasheet HTML 9Page - ON Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 5 / 10 page
background image
CS51031
http://onsemi.com
5
Startup
The CS51031 has an externally programmable Soft−Start
feature that allows the output voltage to come up slowly,
preventing voltage overshoot on the output.
At startup, the voltage on all pins is zero. As VCC rises, the
VC voltage along with the internal resistor RG keeps the
P−Ch FET off. As VCC and VC continue to rise, the oscillator
capacitor (COSC ) and the Soft−Start/Fault Timing capacitor
(CS) charges via internal current sources. COSC gets charged
by the current source IC and CS gets charged by the IT source
combination described by:
ICS + IT *
IT
55
)
IT
5
The internal Holdoff Comparator ensures that the external
P−Ch FET is off until VCS > 0.7 V, preventing the GATE
flip−flop (F2) from being set. This allows the oscillator to
reach its operating frequency before enabling the drive
output. Soft−Start is obtained by clamping the VFB
comparator’s (A6) reference input to approximately 1/2 of
the voltage at the CS pin during startup, permitting the
control loop and the output voltage to slowly increase. Once
the CS pin charges above the Holdoff Comparator trip point
of 0.7 V, the low feedback to the VFB Comparator sets the
GATE flip−flop during COSC’s charge cycle. Once the
GATE flip−flop is set, VGATE goes low and turns on the
P−Ch FET. When VCS exceeds 2.3 V, the CS charge sense
comparator (A4) sets the VFB comparator reference to
1.25 V completing the startup cycle.
Lossless Short Circuit Protection
The CS51031 has “lossless” short circuit protection since
there is no current sense resistor required. When the voltage
at the CS pin (the fault timing capacitor voltage) reaches
2.5 V during startup, the fault timing circuitry is enabled by
A2. During normal operation the CS voltage is 2.6 V. During
a short circuit or a transient condition, the output voltage
moves lower and the voltage at VFB drops. If VFB drops
below 1.15 V, the output of the fault comparator goes high
and the CS51031 goes into a fast discharge mode. The fault
timing capacitor, CS, discharges to 2.4 V. If the VFB voltage
is still below 1.15 V when the CS pin reaches 2.4 V, a valid
fault condition has been detected. The slow discharge
comparator output goes high and enables gate G5 which sets
the slow discharge flip−flop. The VGATE flip−flop resets and
the output switch is turned off. The fault timing capacitor is
slowly discharged to 1.5 V. The CS51031 then enters a
normal startup routine. If the fault is still present when the
fault timing capacitor voltage reaches 2.5 V, the fast and
slow discharge cycles repeat as shown in figure 3.
If the VFB voltage is above 1.15 V when CS reaches 2.4 V
a fault condition is not detected, normal operation resumes
and CS charges back to 2.6 V. This reduces the chance of
erroneously detecting a load transient as a fault condition.
Figure 3. Voltage on Start Capacitor (VGS), the Gate (VGATE), and in the
Feedback Loop (VFB), During Startup, Normal and Fault Conditions
1.15 V
1.25 V
0 V
1.5 V
2.4 V
2.6 V
2.5 V
0 V
VCS
VGATE
VFB
START
NORMAL OPERATION
FAULT
td1
TSTART
tFAULT
tRESTART td2
tFAULT
S1
S2
S1
S2
S3
S3
S1
S2
S3
S3
0.7 V


Codice articolo simile - CS51031GDR8

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
CS51031GDR8 ONSEMI-CS51031GDR8 Datasheet
86Kb / 12P
   Fast PFET Buck Controller
December, 2001 ??Rev. 9
CS51031GDR8 ONSEMI-CS51031GDR8 Datasheet
100Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
CS51031GDR8G ONSEMI-CS51031GDR8G Datasheet
100Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
More results

Descrizione simile - CS51031GDR8

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
ON Semiconductor
CS51031 ONSEMI-CS51031_10 Datasheet
100Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
CS51033 ONSEMI-CS51033_05 Datasheet
96Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 10
logo
Texas Instruments
LM3409 TI1-LM3409 Datasheet
1Mb / 45P
[Old version datasheet]   P-FET Buck Controller for High-Power LED Drivers
logo
HTC Korea TAEJIN Techno...
LM51031 HTC-LM51031 Datasheet
273Kb / 9P
   Fast PFET Buck Controller
logo
ON Semiconductor
CS51031 ONSEMI-CS51031 Datasheet
86Kb / 12P
   Fast PFET Buck Controller
December, 2001 ??Rev. 9
CS51033 ONSEMI-CS51033 Datasheet
86Kb / 12P
   Fast PFET Buck Controller
October, 2002 ??Rev. 8
logo
NTE Electronics
NTE2905 NTE-NTE2905 Datasheet
100Kb / 3P
   P?묬h, Enhancement Mode High Speed Switch
logo
Winbond
W83320S WINBOND-W83320S Datasheet
506Kb / 18P
   N-Channel FET Synchronous Buck Regulator Controller
logo
Nuvoton Technology Corp...
W83321S NUVOTON-W83321S Datasheet
571Kb / 18P
   N-Channel FET Synchronous Buck Regulator Controller
logo
Winbond
W83321S WINBOND-W83321S Datasheet
795Kb / 18P
   N-Channel FET Synchronous Buck Regulator Controller
More results


Html Pages

1 2 3 4 5 6 7 8 9 10


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
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