|
|
PDF IRS2541 Data sheet ( Hoja de datos )
| Número de pieza | IRS2541 | |
| Descripción | (IRS2540 / IRS2541) LED Buck Regulator Control IC | |
| Fabricantes | International Rectifier | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de IRS2541 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
www.DataSheet4U.com
Data Sheet No. PD60293
IRS254(0,1)(S)PbF
LED BUCK REGULATOR CONTROL IC
Description
The IRS254(0,1) are high voltage, high frequency
buck control ICs for constant LED current regulation.
They incorporate a continuous mode time-delayed
hysteretic buck regulator to directly control the
average load current, using an accurate on-chip
bandgap voltage reference.
The application is inherently protected against short
circuit conditions, with the ability to easily add open-
circuit protection. An external high-side bootstrap
circuit drives the buck switching element at high
frequencies. A low-side driver is also provided for
synchronous rectifier designs. All functions are
realized within a simple 8 pin DIP or SOIC package.
Features
• 200 V (IRS2540) and 600 V (IRS2541) half bridge
driver
• Micropower startup (<500 µA)
• ±2% voltage reference
• 140 ns deadtime
• 15.6 V zener clamp on VCC
• Frequency up to 500 kHz
• Auto restart, non-latched shutdown
• PWM dimmable
• Small 8-Lead DIP/8-Lead SOIC packages
Packages
Typical Application Diagram
8-Lead PDIP
IRS254(0,1)PbF
8-LeadSOIC
IRS254(0,1)SPbF
VBUS
COM
EN
L2
CBUS2
CBUS1
RS1
RS2
DBOOT
CVCC1
ROV1
DCLAMP CVCC2
DOV
ROV2
CEN
VCC
1
COM
2
IFB
3
ENN
4
IC1
VB
8
HO
7
VS
6
LO
5
RF
RG1
M1
CBOOT
L1
RG2
M2
COUT
ROUT
CF
DEN1
VOUT+
VOUT-
RCS
www.irf.com
DataSheet4 U .com
Page 1
1 page  
www.DataSheet4U.com
IRS254(0,1)(S)PbF
Electrical Characteristics
VCC = VBS = VBIAS = 14 V +/- 0.25 V, CLO=CHO=1000 pF, CVCC=CVBS=0.1 µF, TA=25 °C unless otherwise specified.
Symbol
Definition
Watchdog timer
tWD Watchdog timer period
PWWD LO pulse width
Min Typ Max Units Test Conditions
--- 20
--- 1.0
---
---
µs
IFB =1 V
Functional Block Diagram
IFB 3
ENN 4
100 K
UVLO
UVN
2V
BANDGAP
REFERENCE 0. 5 V
DELAY LEVEL
SHIFT
PULSE
FILTER &
LATCH
DELAY
15.6 V
8 VB
7 HO
6 VS
1 VCC
5 LO
Watchdog
Timer20 µS
1 µS Pulse
Generator
2 COM
Values in block diagram are typical values
Lead Assignment
Pin Assignments
VCC 1
COM 2
IFB 3
ENN 4
8 VB
7 HO
6 VS
5 LO
Pin #
1
2
3
4
5
6
7
8
Symbol
VCC
COM
IFB
ENN
LO
VS
HO
VB
Description
Supply voltage
IC power & signal ground
Current feedback
Disable outputs (LO=High, HO=Low)
Low-side gate driver output
High-side floating return
High-side gate driver output
High-side gate driver floating supply
www.irf.com
DataSheet4 U .com
Page 5
5 Page 
www.DataSheet4U.com
1000
100
0uF
4.7uF
10uF
22uF
33uF
47uF
10
30 50 70 90 110 130 150 170
Vin (V)
Fig. 13 Iout = 350 mA, Vout = 16.8 V, L = 470 µH
400
350
300
250
200
150
100
50
0
0
10 20 30 40
Capacitance (uF)
50
Fig. 14 I out = 350 mA, Vout = 16.8 V, L = 470 µH
40V
100V
160V
The addition of the COUT increases the amount of
energy that can be stored in the output stage, which
also means it can supply current for an increased
period of time. Therefore by slowing down the di/dt
transients in the load, the frequency is effectively
decreased.
With the COUT capacitor, the inductor current is no
longer identical to that seen in the load. The
inductor current will still have a perfectly triangular
shape, where as the load will see the same basic
trend in the current, but all sharp corners will be
rounded with all peaks significantly reduced, as can
be seen in Fig. 15
VCC Supply
Since the IRS245(0,1) is rated for 200 V (or 600 V),
VBUS can reach values of this magnitude. If only a
supply resistor to VBUS is used, it will experience
extremely high power losses. For higher voltage
applications an alternate VCC supply scheme utilizing
the micro-power start-up and a resistor feed-back
www.irf.com
DataSheet4 U .com
IRS254(0,1)(S)PbF
from the output needs to be implemented, as seen in
Fig. 16.
Fig. 15 Iout = 350 mA, Vin = 100 V, Vout = 16.85 V, L = 470 µH,
C out = 33 µF
The resistance between VBUS and VCC supply should
be large enough to minimize the current sourced
directly from the input voltage line; value should be
on the order of hundreds of kΩ. Through the supply
resistor, a current will flow to charge the VCC
capacitor. Once the capacitor is charged up to the
VCCUV+ threshold, the IRS254(0,1) enters the micro
start-up regime and begins to operate, activating the
LO and HO outputs. After the first few cycles of
switching, the resistor connected between the output
and VCC will take over and source all necessary
current for the IC. The resistor connecting the
output to the supply should be carefully designed
according to its power rating.
RS 2 = Vout −15.6V
10mA
PRS 2 = (10mA)2 RS 2 ≤ PRS 2 _ Rated 2
Icc ≈ 10mA
VBUS
ENN
VCC 1
COM 2
IFB
3
ENN
4
VB
8
HO
7
VS
6
LO
5
COM
Fig. 16 Alternate Supply Diagram
Page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet IRS2541.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| IRS2540 | (IRS2540 / IRS2541) LED Buck Regulator Control IC | International Rectifier |
| IRS25401 | (IRS25401 / IRS25411) LED BUCK REGULATOR CONTROL IC | International Rectifier |
| IRS2540PBF | (IRS254xxPBF) LED BUCK REGULATOR CONTROL IC | International Rectifier |
| IRS2540SPBF | (IRS254xxPBF) LED BUCK REGULATOR CONTROL IC | 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 |