|
|
PDF IR3624MPBF Data sheet ( Hoja de datos )
| Número de pieza | IR3624MPBF | |
| Descripción | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de IR3624MPBF (archivo pdf) en la parte inferior de esta página. Total 21 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
Data Sheet No.PD94714 revA
IR3624MPBF
HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER
Features
• Internal 600kHz Oscillator
• Operates with Single 5V or 12V Supply
• Programmable Over Current Protection
• Hiccup Current Limit Using MOSFET RDS(on)
sensing
• Precision Reference Voltage (0.6V)
• Programmable Soft-Start
• Pre-Bias Start-up
• Thermal Protection
• 10-Lead MLPD Package
Applications
• Embedded Telecom Systems
• Distributed Point of Load Power Architectures
• Computing Peripheral Voltage Regulator
• Graphics Card
• General DC/DC Converters
Description
The IR3624 is a PWM controller designed for
high performance synchronous Buck DC/DC
applications. The IR3624 drives a pair of external
N-MOSFETs using a fixed 600kHz switching
frequency allowing the use of small external
components. The output voltage can be precisely
regulated using the internal 0.6V reference
voltage for low voltage applications. Protection
such as Pre-Bias startup, hiccup current limit and
thermal shutdown are provided to give required
system level security in the event of fault
conditions.
Vin
Vcc
Vc
HDrv
OCSet
U1
Comp
LDrv
PGnd
SS / SD
Gnd
Fb
Fig. 1: Typical application Circuit
ORDERING INFORMATION
PKG PACKAGE
DESIG DESCRIPTION
M IR3624MPBF
M IR3624MTRPBF
PIN
COUNT
10
10
PARTS
PER TUBE
121
--------
PARTS
PER REEL
-------
3000
T&R
ORIANTAION
Figure A
Vout
1 page  
www.DataSheet4U.com
IR3624MPBF
Recommended Operating Conditions
Symbol Definition
Min
Max
Units
Vcc Supply Voltage
4.5 14
V
Vc Supply Voltage
10 28
V
Fs Operating Frequency
660 kHz
Tj
Junction Temperature
-40
125
oC
Electrical Specifications
Unless otherwise specified, these specification apply over Vcc=Vc=12V, 0oC<Tj< 105oC
Parameter
SYM
Test Condition
Min TYP
Reference Voltage
Feedback Voltage
Accuracy
VFB
0oC<Tj<105oC
-40oC<Tj<105oC, Note1
0.6
-1.5
-2.5
MAX
+1.5
+1.5
Units
V
%
%
Supply Current
VCC Supply Current
(Static)
VCC Supply Current
(Dynamic)
VC Supply Current
(Static)
VC Supply Current
(Dynamic)
ICC(Static)
ICC(Dynamic)
IC(Static)
IC(Dynamic)
Under Voltage Lockout
VCC-Start-Threshold
VCC-Stop-Threshold
VCC-Hysteresis
VC-Start-Threshold
VC-Stop-Threshold
VC-Hysteresis
Oscillator
VCC_UVLO(R)
VCC_UVLO(F)
VC_UVLO(R)
VC_UVLO(F)
Frequency
Ramp Amplitude
FS
Vramp
Min Duty Cycle
Min Pulse Width
Max Duty Cycle
Dmin
Dmin(ctrl)
Dmax
SS=0V, No Switching
Fs=600kHz, CLOAD=1.5nF
SS=0V, No Switching
Fs=600kHz, CLOAD=1.5nF
Supply ramping up
Supply ramping down
Supply ramping up and down
Supply ramping up
Supply ramping down
Supply ramping up and down
Note2
Fb=1V
Fs=600kHz, Note2
Fs=600kHz, Fb=0.5V
6
10
3
17
4.0
3.7
0.15 0.25
3.1
2.85
0.15 0.2
540 600
1.25
71
8
15
6
25
4.4
4.1
0.3
3.5
3.25
0.25
660
0
80
mA
mA
mA
mA
V
V
V
V
V
V
kHz
V
%
ns
%
Note1: Cold temperature performance is guaranteed via correlation using statistical quality control.
Not tested for production.
Note2: Guaranteed by Design but not tested for production.
5
5 Page 
www.DataSheet4U.com
Application Information
Design Example:
The following example is a typical application for
IR3624. The application circuit is shown in
page17.
Vin = 12V,(13.2V,max)
Vo = 1.8V
Io = 6A
∆Vo ≤ 30mV
Fs = 600kHz
Output Voltage Programming
Output voltage is programmed by reference
voltage and external voltage divider. The Fb pin
is the inverting input of the error amplifier, which
is internally referenced to 0.6V. The divider is
ratioed to provide 0.6V at the Fb pin when the
output is at its desired value. The output voltage
is defined by using the following equation:
Vo
= Vref
∗ ⎜⎜⎝⎛1 +
R8
R9
⎟⎟⎠⎞
--( 4 )
When an external resistor divider is connected to
the output as shown in figure 10.
IR3624
Fb
VOUT
R8
R9
Fig. 10: Typical application of the IR3624 for
programming the output voltage
Equation (4) can be rewritten as:
R9
=
R8
∗
⎜⎜⎝⎛
V
Vref
−VO ref
⎟⎟⎠⎞
--(5 )
For the calculated values of R8 and R9 see
feedback compensation section.
IR3624MPBF
Soft-Start Programming
The soft-start timing can be programmed by
selecting the soft-start capacitance value. The
start-up time of the converter can be calculated
by using:
CSS ≅ 20µA *Tstart --(1)
Where Tstart is the desired start-up time (ms)
For a start-up time of 5ms, the soft-start
capacitor will be 0.1uF. Choose a ceramic
capacitor at 0.1uF.
Vc supply for single input voltage
To drive the high side switch, it is necessary to
supply a gate voltage at least 4V grater than the
bus voltage. This is achieved by using a charge
pump configuration as shown in figure 11. This
method is simple and inexpensive. The operation
of the circuit is as follows: when the lower
MOSFET is turned on, the capacitor (C1) is
pulled down to ground and charges, up to VBUS
value, through the diode (D1). The bus voltage
will be added to this voltage when upper
MOSFET turns on in next cycle, and providing
supply voltage (Vc) through diode (D2). Vc is
approximately:
( )VC ≅ 2 ∗Vbus − VD1 +VD2 --(6 )
Capacitors in the range of 0.1uF is generally
adequate for most applications. The diodes must
be a fast recovery device to minimize the amount
of charge fed back from the charge pump
capacitor into VBUS. The diodes need to be able
to block the full power rail voltage, which is seen
when the high side MOSFET is switched on. For
low voltage application, schottky diodes can be
used to minimize forward drop across the diodes
at start up.
VBUS
D1
C3
D2
Vc
C2
VBUS
C1 Q1
L
IR3624 HDrv Q2
Fig. 11: Charge pump circuit to generate
Vc voltage
11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet IR3624MPBF.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| IR3624MPBF | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER | International Rectifier |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |