Electronic Components Datasheet Search
  English  ▼

X  

ISL6753 Datasheet(PDF) 10 Page - Intersil Corporation

Part # ISL6753
Description  ZVS Full-Bridge PWM Controller
PDF  15 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6753 Datasheet(HTML) 10 Page - Intersil Corporation

Back Button ISL6753 Datasheet HTML 6Page - Intersil Corporation ISL6753 Datasheet HTML 7Page - Intersil Corporation ISL6753 Datasheet HTML 8Page - Intersil Corporation ISL6753 Datasheet HTML 9Page - Intersil Corporation ISL6753 Datasheet HTML 10Page - Intersil Corporation ISL6753 Datasheet HTML 11Page - Intersil Corporation ISL6753 Datasheet HTML 12Page - Intersil Corporation ISL6753 Datasheet HTML 13Page - Intersil Corporation ISL6753 Datasheet HTML 14Page - Intersil Corporation Next Button
Zoom Inzoom in Zoom Outzoom out
 10 / 15 page
background image
10
FN9182.1
March 10, 2005
The charging time of the ramp capacitor is
For optimum performance, the maximum value of the
capacitor should be limited to 10nF. The maximum DC
current through the resistor should be limited to 2mA
maximum. For example, if the oscillator frequency is
400kHz, the minimum input voltage is 300V, and a 4.7nF
ramp capacitor is selected, the value of the resistor can be
determined by rearranging EQ. 7.
where t is equal to the oscillator period minus the deadtime.
If the deadtime is short relative to the oscillator period, it can
be ignored for this calculation.
If feed forward operation is not desired, the RC network may
be connected to VREF rather than the input voltage.
Alternatively, a resistor divider from CTBUF may be used as
the sawtooth signal. Regardless, a sawtooth waveform must
be generated on RAMP as it is required for proper PWM
operation.
Slope Compensation
Peak current-mode control requires slope compensation to
improve noise immunity, particularly at lighter loads, and to
prevent current loop instability, particularly for duty cycles
greater than 50%. Slope compensation may be
accomplished by summing an external ramp with the current
feedback signal or by subtracting the external ramp from the
voltage feedback error signal. Adding the external ramp to
the current feedback signal is the more popular method.
From the small signal current-mode model [1] it can be
shown that the naturally-sampled modulator gain, Fm,
without slope compensation, is
where Sn is the slope of the sawtooth signal and Tsw is the
duration of the half-cycle. When an external ramp is added,
the modulator gain becomes
where Se is slope of the external ramp and
The criteria for determining the correct amount of external
ramp can be determined by appropriately setting the
damping factor of the double-pole located at half the
oscillator frequency. The double-pole will be critically
damped if the Q-factor is set to 1, and over-damped for Q >
1, and under-damped for Q < 1. An under-damped condition
can result in current loop instability.
where D is the percent of on time during a half cycle. Setting
Q = 1 and solving for Se yields
Since Sn and Se are the on time slopes of the current ramp
and the external ramp, respectively, they can be multiplied
by Ton to obtain the voltage change that occurs during Ton.
where Vn is the change in the current feedback signal during
the on time and Ve is the voltage that must be added by the
external ramp.
Vn can be solved for in terms of input voltage, current
transducer components, and output inductance yielding
where RCS is the current sense burden resistor, NCT is the
current transformer turns ratio, LO is the output inductance,
VO is the output voltage, and Ns and Np are the secondary
and primary turns, respectively.
FIGURE 6. VOLTAGE FEED FORWARD CONTROL
VIN
R3
C7
GND
1
2
4
3
5
6
7
89
10
11
12
13
14
15
16
RAMP
ISL6753
tR3 C7
1
V
RAMP PEAK
()
V
IN MIN
()
----------------------------------------



ln
⋅⋅
=
S
(EQ. 7)
R3
t
C7
1
V
RAMP PEAK
()
V
IN MIN
)
()
----------------------------------------



ln
-------------------------------------------------------------------------
2.5
10
6
4.7 10
9
1
1
300
----------


ln
⋅⋅
------------------------------------------------------------
==
159
=
k
(EQ. 8)
Fm
1
SnTsw
--------------------
=
(EQ. 9)
Fm
1
Sn
Se
+
()Tsw
---------------------------------------
1
m
c SnTsw
----------------------------
==
(EQ. 10)
m
c
1
Se
Sn
-------
+
=
(EQ. 11)
Q
1
π m
c 1D
() 0.5
()
-------------------------------------------------
=
(EQ. 12
S
e
S
n
1
π
--- 0.5
+

 1
1D
------------- 1


=
(EQ. 13)
V
e
V
n
1
π
--- 0.5
+

 1
1D
------------- 1


=
(EQ. 14)
V
e
T
SW V
O
R
CS
N
CT LO
------------------------------------------
N
S
N
P
--------
1
π
--- D0.5
+


=
V
(EQ. 15)
ISL6753


Similar Part No. - ISL6753

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
ISL6753 INTERSIL-ISL6753 Datasheet
399Kb / 15P
ZVS Full-Bridge PWM Controller
logo
Renesas Technology Corp
ISL6753 RENESAS-ISL6753 Datasheet
686Kb / 15P
ZVS Full-Bridge PWM Controller
logo
Intersil Corporation
ISL6753 INTERSIL-ISL6753 Datasheet
393Kb / 15P
ZVS Full-Bridge PWM Controller
April 4, 2006
ISL6753AAZA INTERSIL-ISL6753AAZA Datasheet
399Kb / 15P
ZVS Full-Bridge PWM Controller
ISL6753AAZA INTERSIL-ISL6753AAZA Datasheet
393Kb / 15P
ZVS Full-Bridge PWM Controller
April 4, 2006
More results

Similar Description - ISL6753

ManufacturerPart #DatasheetDescription
logo
Intersil Corporation
ISL6551 INTERSIL-ISL6551 Datasheet
619Kb / 26P
ZVS Full Bridge PWM Controller
ISL6551 INTERSIL-ISL6551_06 Datasheet
616Kb / 26P
ZVS Full Bridge PWM Controller
ISL6753 INTERSIL-ISL6753_06 Datasheet
399Kb / 15P
ZVS Full-Bridge PWM Controller
ISL6551IREC INTERSIL-ISL6551IREC Datasheet
506Kb / 23P
ZVS Full Bridge PWM Controller
ISL6551IBZ INTERSIL-ISL6551IBZ Datasheet
652Kb / 27P
ZVS Full Bridge PWM Controller
April 30, 2015
ISL6753AAZA INTERSIL-ISL6753AAZA Datasheet
393Kb / 15P
ZVS Full-Bridge PWM Controller
April 4, 2006
logo
Renesas Technology Corp
ISL6753 RENESAS-ISL6753 Datasheet
686Kb / 15P
ZVS Full-Bridge PWM Controller
ISL6755 RENESAS-ISL6755 Datasheet
804Kb / 17P
ZVS Full-Bridge PWM Controller with Average Current Limit
ISL6551 RENESAS-ISL6551 Datasheet
1Mb / 27P
ZVS Full Bridge PWM Controller
Oct 28, 2015
ISL6551I RENESAS-ISL6551I Datasheet
1Mb / 24P
ZVS Full Bridge PWM Controller
Nov 17, 2011
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.COM
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