Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

UCC28250 Datasheet(PDF) 41 Page - Texas Instruments

Click here to check the latest version.
Part No. UCC28250
Description  Advanced PWM Controller With Pre-Bias Operation
Download  50 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC28250 Datasheet(HTML) 41 Page - Texas Instruments

Back Button UCC28250 Datasheet HTML 37Page - Texas Instruments UCC28250 Datasheet HTML 38Page - Texas Instruments UCC28250 Datasheet HTML 39Page - Texas Instruments UCC28250 Datasheet HTML 40Page - Texas Instruments UCC28250 Datasheet HTML 41Page - Texas Instruments UCC28250 Datasheet HTML 42Page - Texas Instruments UCC28250 Datasheet HTML 43Page - Texas Instruments UCC28250 Datasheet HTML 44Page - Texas Instruments UCC28250 Datasheet HTML 45Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 41 / 50 page
background image
(
)
d SP
SW
T
1
1
T
150ns
2 f
2 150kHz
R
94.9k
R4
100k
33.2pF
33.2pF
-
-
´
´
=
=
=
W Þ
=
W
IN
pre bias
RAMP
SR _ RAMP
pre bias
V
36 V
V
3.0 V
2 n
2 4
V
V
3.0 V
0.750 V
2 V
2 3.0 V
-
-
-
-
´
´
=
´
=
´
=
´
´
O
IN
n V
1
4 3.3 V
1
D
0.176
V
2
75 V / 2
2
2
´
´
=
´
=
´
=
SR _ D
1 D
1 0.176
0.82
=
-
=
-
=
COMP
V
(SR _ D 0.5) 3.0 V 2
(0.824 0.5) 3.0 V 2
1.944 V
=
-
´
´
=
-
´
´
=
COMP
RAMP
V
1.944 V
V
5.523 V
(D 2)
(0.176 2)
=
=
=
´
´
RAMP _ 1
CHARGE
RAMP
sw
CHARGE
RAMP
1
1
R
336.9k
36 V
V
2 ln(
) 470pF 150kHz
2 ln
C
f
36 V
0.750 V
V
V
=
=
=
W
æ
ö
´
´
´
´
´
´
ç
÷
-
-
è
ø
RAMP _ 2
CHARGE
RAMP
sw
CHARGE
RAMP
1
1
R
92.7k
75 V
V
2 ln(
) 470pF 150kHz
2 ln
C
f
75 V
5.523 V
V
V
=
=
=
W
æ
ö
´
´
´
´
´
´
ç
÷
-
-
è
ø
UCC28250
www.ti.com
SLUSA29B – APRIL 2010 – REVISED OCTOBER 2010
Step 3, Programming the Device
Step 3-1
Equation 3 is used to determine RT based on switching frequency, 300 kHz and assumes the dead time of 150
ns.
(29)
Step 3-2, Determine RAMP Resistance and Capacitance
There are two-fold considerations to determine RAMP resistance and capacitance. Equation 23 provides RAMP
consideration for SR initial start up with prebias. The corresponding RAMP peak voltage is determined with input
voltage low line and maximum prebias output voltage. In the below T1 turns ratio n = 4.
(30)
Equation 24 and Equation 25 provides RAMP consideration for soft start completion to make duty cycle match
(1-D) = SR_D.
1. Calculate OUTA or OUTB duty cycle at 75-V input voltage, 3.3-V output.
(31)
2. Calculate SRA or SRB duty cycle.
(32)
3. Calculate the COMP voltage value in steady state (Equation 24).
(33)
4. Calculate the RAMP peak value (Equation 25).
(34)
5. Arbitrary select CRAMP 470 pF, then C3 = 470 pF.
6. Calculate RRAMP.
(35)
(36)
As different RAMP resistor values are obtained, at this stage, we may take their average value for initial design.
Copyright © 2010, Texas Instruments Incorporated
Submit Documentation Feedback
41
Product Folder Link(s): UCC28250


Similar Part No. - UCC28250

ManufacturerPart No.DatasheetDescription
Texas Instruments
Texas Instruments
UCC28250 TI-UCC28250 Datasheet
758Kb / 48P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250PW TI-UCC28250PW Datasheet
758Kb / 48P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250PW TI1-UCC28250PW Datasheet
980Kb / 53P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250PWR TI-UCC28250PWR Datasheet
758Kb / 48P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250PWR TI1-UCC28250PWR Datasheet
980Kb / 53P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
More results

Similar Description - UCC28250

ManufacturerPart No.DatasheetDescription
Texas Instruments
Texas Instruments
UCC28250 TI1-UCC28250_12 Datasheet
980Kb / 53P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250 TI-UCC28250_15 Datasheet
997Kb / 54P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28250 TI-UCC28250_10 Datasheet
758Kb / 48P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28251 TI1-UCC28251 Datasheet
902Kb / 54P
[Old version datasheet]   Advanced PWM Controller With Pre-Bias Operation
UCC28251 TI1-UCC28251_16 Datasheet
1Mb / 55P
[Old version datasheet]   Advanced PWM Controller With Prebias Operation
UCC28251 TI-UCC28251_15 Datasheet
1Mb / 55P
[Old version datasheet]   UCC28251 Advanced PWM Controller With Prebias Operation
Microsemi Corporation
Microsemi Corporation
LX1660 MICROSEMI-LX1660 Datasheet
323Kb / 15P
   ADVANCED PWM CONTROLLER
International Rectifier
International Rectifier
IR3621 IRF-IR3621 Datasheet
375Kb / 29P
   2-PHASE / DUAL SYNCHRONOUS PWM CONTROLLER WITH OSCILLATOR SYNCHRONIZATION AND PRE-BIAS STARTUP
Texas Instruments
Texas Instruments
UC1638 TI1-UC1638_13 Datasheet
4Mb / 16P
[Old version datasheet]   Advanced PWM Motor Controller
Anpec Electronics Coropration
Anpec Electronics Corop...
APW7016 ANPEC-APW7016 Datasheet
114Kb / 11P
   Advanced PWM Power Controller
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 


Datasheet Download

Go To PDF Page


Link URL




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

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   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