Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

CS51031YN8 Datasheet(PDF) 4 Page - Cherry Semiconductor Corporation

No. de pieza CS51031YN8
Descripción Electrónicos  Fast PFET Buck Controller Does Not Require Compensation
Download  8 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  CHERRY [Cherry Semiconductor Corporation]
Página de inicio  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS51031YN8 Datasheet(HTML) 4 Page - Cherry Semiconductor Corporation

  CS51031YN8 Datasheet HTML 1Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 2Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 3Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 4Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 5Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 6Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 7Page - Cherry Semiconductor Corporation CS51031YN8 Datasheet HTML 8Page - Cherry Semiconductor Corporation  
Zoom Inzoom in Zoom Outzoom out
 4 / 8 page
background image
4
Block Diagram
G5
COSC
CS
VREF
VC
VGATE
PGnd
VFB
Gnd
R
S
2.5V
1.5V
1.25V
1.15V
Q
F2
G2
G1
A1
A6
RG
VCC
3.3V
VCCOK
A3
2.4V
G3
VREF = 3.3V
A2
2.5V
1.5V
IC
7IC
VREF
VCC
+
-
IT
+
Q
IT
5
IT
55
G4
Fault
Comp
+
-
+
-
A4
0.7V
2.3V
Q
R
Q
S
F1
Slow Discharge
Comparator
Slow Discharge
Flip-Flop
CS Charge
Sense
Comparator
CS
Comparator
Oscillator
Comparator
VFB
Comparator
VGATE
Flip-Flop
Hold
Off
Comp
Control Scheme
The CS51031 monitors and the output voltage to determine
when to turn on the PFET. If VFB falls below the internal
reference voltage of 1.25V during the oscillatorÕs charge
cycle, the PFET is turned on and remains on for the dura-
tion of the charge time. The PFET gets turned off and
remains off during the oscillatorÕs discharge time with the
maximum duty cycle to 80%. It requires 7mV typical, and
20mV maximum ripple on the VFB pin is required to oper-
ate. This method of control does not require any loop sta-
bility compensation.
Startup
The CS51031 has an externally programmable soft start fea-
ture that allows the output voltage to come up slowly, pre-
venting 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
PFET 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 -
( + ).
The internal Holdoff Comparator ensures that the external
PFET is off until VCS > 0.7V, 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 comparatorÕs (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 0.7V, the low
feedback to the VFB Comparator sets the GATE flip-flop
during COSC Õs charge cycle. Once the GATE flip-flop is set,
VGATE goes low and turns on the PFET. When VCS exceeds
IT
5
IT
55
Theory of Operation
Circuit Description
Figure 1: Block Diagram for CS51031


Número de pieza similar - CS51031YN8

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
ON Semiconductor
CS51031YD8 ONSEMI-CS51031YD8 Datasheet
86Kb / 12P
   Fast PFET Buck Controller
December, 2001 ??Rev. 9
CS51031YD8 ONSEMI-CS51031YD8 Datasheet
95Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
CS51031YD8 ONSEMI-CS51031YD8 Datasheet
100Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
CS51031YD8G ONSEMI-CS51031YD8G Datasheet
95Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
CS51031YD8G ONSEMI-CS51031YD8G Datasheet
100Kb / 10P
   Fast P?묬h FET Buck Controller
October, 2005 ??Rev. 11
More results

Descripción similar - CS51031YN8

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
Cherry Semiconductor Co...
CS51033 CHERRY-CS51033 Datasheet
159Kb / 8P
   Fast PFET Buck Controller Does Not Require Compensation
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
Texas Instruments
LM3485 TI-LM3485_15 Datasheet
1Mb / 24P
[Old version datasheet]   Hysteretic PFET Buck Controller
logo
National Semiconductor ...
LM3485 NSC-LM3485 Datasheet
369Kb / 15P
   Hysteretic PFET Buck Controller
logo
Texas Instruments
LM3485 TI1-LM3485_14 Datasheet
1,023Kb / 22P
[Old version datasheet]   Hysteretic PFET Buck Controller
LM3475 TI1-LM3475_14 Datasheet
1Mb / 21P
[Old version datasheet]   Hysteretic PFET Buck Controller
LM3485 TI1-LM3485_16 Datasheet
1Mb / 28P
[Old version datasheet]   Hysteretic PFET Buck Controller
logo
National Semiconductor ...
LM3475 NSC-LM3475 Datasheet
305Kb / 14P
   Hysteretic PFET Buck Controller
More results


Html Pages

1 2 3 4 5 6 7 8


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
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