irs2540 International Rectifier Corp., irs2540 Datasheet

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irs2540

Manufacturer Part Number
irs2540
Description
Led Buck Regulator Control Ic -
Manufacturer
International Rectifier Corp.
Datasheet

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www.irf.com
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.
Typical Application Diagram
COM
VBUS
EN
L2
CBUS1
CBUS2
ROV1
ROV2
DEN1
DCLAMP
RS2
DOV
CEN
CVCC1
LED BUCK REGULATOR CONTROL IC
CVCC2
RS1
CF
COM
ENN
VCC
IFB
Features
x 200 V (IRS2540) and 600 V (IRS2541) half bridge
x Micropower startup (<500 PA)
x ±2% voltage reference
x 140 ns deadtime
x 15.6 V zener clamp on V
x Frequency up to 500 kHz
x Auto restart, non-latched shutdown
x PWM dimmable
x Small 8-Lead DIP/8-Lead SOIC packages
Packages
1
2
3
4
driver
DBOOT
IC1
RF
IRS254(0,1)PbF
8-Lead PDIP
8
7
6
5
VB
HO
VS
LO
IRS254(0,1)(S)PbF
RG2
CBOOT
RG1
CC
M2
M1
COUT
L1
ROUT
Data Sheet No. PD60293
8-LeadSOIC
IRS254(0,1)SPbF
RCS
VOUT +
VOUT -
Page 1

Related parts for irs2540

irs2540 Summary of contents

Page 1

... Typical Application Diagram VBUS L2 CBUS1 COM EN www.irf.com LED BUCK REGULATOR CONTROL IC Features x 200 V (IRS2540) and 600 V (IRS2541) half bridge driver x Micropower startup (<500 PA) x ±2% voltage reference x 140 ns deadtime x 15.6 V zener clamp Frequency up to 500 kHz x Auto restart, non-latched shutdown x PWM dimmable ...

Page 2

Alternate application circuit using a single MOSFET www.irf.com IRS254(0,1)(S)PbF Page 2 ...

Page 3

... CC -20 20 -50 50 --- 1 --- 0.625 --- 125 --- 200 -55 150 -55 150 --- 300 and COM, with a nominal breakdown voltage of CC Min. Max. V – 0 CLAMP IRS2540 -1 200 IRS2541 -1 600 V V CCUV+ CLAMP Note 2 10 -25 125 . CLAMP Units V mA V/ns W ºC/W ºC CLAMP Units V mA ºC Page 3 ...

Page 4

... µA CC 1.0 2.0 EN>V ENTH+ 1.0 2 Duty Cycle = 50% 2.0 3 kHz 15.6 16 1.0 2 2.0 3 7.5 8.5 V 7.0 8.0 IRS2540 µA IRS2541 2.7 3.0 V 2.0 2.3 500 510 mV 500 540 500 --- kHz COM --- V V --- CC 50 120 0.5/0.7 --- A 140 --- 320 --- kHz square FB wave, 200 mV pk-pk ...

Page 5

Electrical Characteristics +/- 0. BIAS Symbol Watchdog timer t Watchdog timer period pulse width WWD Functional Block Diagram IFB 3 UVLO 4 ENN BANDGAP 100 ...

Page 6

STATE DIAGRAM IRS254(0,1)(S)PbF Page 6 ...

Page 7

Functional Description Operating Mode The IRS254(0,1) operates as a time-delayed hysteritic buck controller. During normal operating conditions the output current is regulated via the IFB pin voltage (nominal value of 500 mV). feedback is compared to an internal high precision ...

Page 8

Watchdog Timer During an open circuit condition, without the watchdog timer, the HO output would remain high at all times and the charge stored in the bootstrap capacitor C would gradually discharge the BOOT floating power supply for the high-side ...

Page 9

Enable Duty Cycle Relationship to Light Output 100 Percentage of Light Output Fig.5 Light Output vs Enable Pin Duty Cycle Fig.6 ...

Page 10

IC does not enter UVLO unless the supply voltage falls below V CCUV- Inductance Selection To maintain tight hysteretic current regulation the inductor and output capacitor C the LEDs) need to be large enough to maintain the supply ...

Page 11

Vin (V) Fig 350 mA 16 470 µH out out 400 350 300 250 200 150 100 Capacitance ...

Page 12

IRS254(0,1)(S)PbF Page 12 ...

Page 13

SOIC Tape & Reel F www.irf.com LOADED TAPE FEED DIRECTION B NOTE : CONTROLLING E DIM ENSION CARRIER TAPE DIMENSION FOR 8SOICN Metric Code Min Max A 7.90 8.10 0.311 B 3.90 4.10 0.153 C 11.70 ...

Page 14

... ORDER INFORMATION 8-Lead PDIP IRS2540PbF 8-Lead PDIP IRS2541PbF 8-Lead SOIC IRS2540SPbF 8-Lead SOIC IRS2541SPbF Tape & Reel 8-Lead SOIC IRS2540STRPbF Tape & Reel 8-Lead SOIC IRS2541STRPbF This product has been designed and qualified for the industrial level. Qualification standards can be found at IR WORLD HEADQUARTERS: 233 Kansas St ...

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