Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.COM

X  

RT9624C Datasheet(PDF) 10 Page - Richtek Technology Corporation

Part # RT9624C
Description  Single Phase Synchronous Rectified Buck MOSFET Driver
Download  13 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT9624C Datasheet(HTML) 10 Page - Richtek Technology Corporation

Back Button RT9624C Datasheet HTML 5Page - Richtek Technology Corporation RT9624C Datasheet HTML 6Page - Richtek Technology Corporation RT9624C Datasheet HTML 7Page - Richtek Technology Corporation RT9624C Datasheet HTML 8Page - Richtek Technology Corporation RT9624C Datasheet HTML 9Page - Richtek Technology Corporation RT9624C Datasheet HTML 10Page - Richtek Technology Corporation RT9624C Datasheet HTML 11Page - Richtek Technology Corporation RT9624C Datasheet HTML 12Page - Richtek Technology Corporation RT9624C Datasheet HTML 13Page - Richtek Technology Corporation  
Zoom Inzoom in Zoom Outzoom out
 10 / 13 page
background image
RT9624C
10
DS9624C-00
September 2012
www.richtek.com
©
Copyright
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Figure 1. Equivalent Circuit and Waveforms (VCC = 12V)
In Figure 1, the current Ig1 and Ig2 are required to move the
gate up to 12V. The operation consists of charging Cgd1,
Cgd2 , Cgs1 and Cgs2. Cgs1 and Cgs2 are the capacitors from
gate to source of the high side and the low side power
MOSFETs, respectively. In general data sheets, the Cgs1
and Cgs2 are referred as “ Ciss” which are the input
capacitors. Cgd1 and Cgd2 are the capacitors from gate to
drain of the high side and the low side power MOSFETs,
respectively and referred to the data sheets as “ C
rss
” the
reverse transfer capacitance. For example, tr1 and tr2 are
the rising time of the high side and the low side power
MOSFETs respectively, the required current Igs1 and Igs2,
are shown as below :
Before driving the gate of the high side MOSFET up to
12V, the low side MOSFET has to be off; and the high
side MOSFET will be turned off before the low side is
turned on. From Figure 1, the body diode “ D2” will be
turned on before high side MOSFETs turn on.
Before the low side MOSFET is turned on, the Cgd2 have
been charged to VIN. Thus, as Cgd2 reverses its polarity
and g2 is charged up to 12V, the required current is
gd1
gd1
gd1
r1
dV
12
I
= C
= C
(3)
dt
t
It is helpful to calculate these currents in a typical case.
Assume a synchronous rectified Buck converter, input
voltage VIN = 12V, Vgs1 = 12V, Vgs2 = 12V. The high side
MOSFET is PHB83N03LT whose Ciss = 1660pF,
Crss = 380pF, and tr = 14ns. The low side MOSFET is
PHB95N03LT whose Ciss = 2200pF, Crss = 500pF and
tr = 30ns, from the equation (1) and (2) we can obtain
from equation. (3) and (4)
IN
gd2
gd2
gd2
r2
V12
dV
I
C
C
(4)
dt
t
+
==
the total current required from the gate driving source can
be calculated as the following equations.
(
)
()
=+
=
+
=
=+
=
+
=
g1
gs1
gd1
g2
gs2
gd2
I
I
I
1.428
0.326
1.754 (A)
(9)
I
I
I
0.88
0.4
1.28 (A)
(10)
By a similar calculation, we can also get the sink current
required from the turned off MOSFET.
Select the Bootstrap Capacitor
Figure 2 shows part of the bootstrap circuit of the
RT9624C. The VCB (the voltage difference between BOOT
and PHASE on RT9624C) provides a voltage to the gate
of the high side power MOSFET. This supply needs to be
ensured that the MOSFET can be driven. For this, the
capacitance CBOOT has to be selected properly. It is
determined by the following constraints.
g1
gs1
gs1
gs1
r1
g2
gs1
gs2
gs1
r2
dV
C
x 12
IC
dt
t
dV
C
x 12
IC
dt
t
==
==
(1)
(2)
-12
gs1
-9
-12
gs2
-9
1660 x 10
x 12
I
1.428
(A)
14 x 10
2200 x 10
x 12
I
0.88
(A)
30 x 10
==
==
(5)
(6)
()
-12
gd1
-9
-12
gd2
-9
380 x 10
x 12
I
0.326 (A)
14 x 10
500 x 10
x 12+12
I
0.4 (A)
30 x 10
==
==
(7)
(8)
12V
t
t
Vg2
Vg1
VPHASE +12V
L
d2
s2
Cgs2
g2
Ig2 Igd2
Igs2
Cgd2
Cgs1
Cgd1
Igd1
Igs1
Ig1
D2
VOUT
s1
VIN
d1
GND
g1
VPHASE


Similar Part No. - RT9624C

ManufacturerPart #DatasheetDescription
logo
Richtek Technology Corp...
RT9624C RICHTEK-RT9624C Datasheet
165Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624CGQWA RICHTEK-RT9624CGQWA Datasheet
165Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624C RICHTEK-RT9624C_15 Datasheet
165Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
More results

Similar Description - RT9624C

ManufacturerPart #DatasheetDescription
logo
Richtek Technology Corp...
RT9624D RICHTEK-RT9624D Datasheet
186Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624C RICHTEK-RT9624C_15 Datasheet
165Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624D RICHTEK-RT9624D_15 Datasheet
153Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624E RICHTEK-RT9624E Datasheet
164Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9614A RICHTEK-RT9614A Datasheet
268Kb / 19P
   Single Phase Synchronous Rectified Buck MOSFET Driver
January 2019
RT9624G RICHTEK-RT9624G Datasheet
164Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624A RICHTEK-RT9624A Datasheet
231Kb / 16P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624B RICHTEK-RT9624B Datasheet
220Kb / 16P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624B RICHTEK-RT9624B_15 Datasheet
186Kb / 16P
   Single Phase Synchronous Rectified Buck MOSFET Driver
RT9624F RICHTEK-RT9624F Datasheet
155Kb / 13P
   Single Phase Synchronous Rectified Buck MOSFET Driver
More results


Html Pages

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


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
Family Site : ic2ic.com  |   icmetro.com