IRS2541 International Rectifier, IRS2541 Datasheet

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IRS2541

Manufacturer Part Number
IRS2541
Description
(IRS2540 / IRS2541) LED Buck Regulator Control IC
Manufacturer
International Rectifier
Datasheet

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DataSheet
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4
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
U
.com
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
• 200 V (IRS2540) and 600 V (IRS2541) half bridge
• Micropower startup (<500 µA)
• ±2% voltage reference
• 140 ns deadtime
• 15.6 V zener clamp on V
• Frequency up to 500 kHz
• Auto restart, non-latched shutdown
• PWM dimmable
• 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

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IRS2541 Summary of contents

Page 1

... DataSheet U .com LED BUCK REGULATOR CONTROL IC 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 V • Frequency up to 500 kHz • Auto restart, non-latched shutdown • ...

Page 2

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

Page 3

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

Page 4

... 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:V =V =200 µA IRS2541:V =V =600 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 ENN 4 BANDGAP ...

Page 6

DataSheet U .com 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 ...

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 ...

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 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

Fig 350 mA, V out 400 350 300 250 200 150 100 Capacitance (uF) Fig 350 mA, V out The addition ...

Page 12

DataSheet U .com IRS254(0,1)(S)PbF Page 12 ...

Page 13

SOIC Tape & Reel www.irf.com 4 DataSheet U .com LOADED TAPE FEED DIRECTION B F NOTE : CONTROLLING E DIM ENSION CARRIER TAPE DIMENSION FOR 8SOICN Metric Code Min Max A 7.90 8.10 B 3.90 ...

Page 14

... DataSheet U .com ORDER INFORMATION 8-Lead PDIP IRS2540PbF 8-Lead PDIP IRS2541PbF 8-Lead SOIC IRS22540SPbF 8-Lead SOIC IRS22541SPbF Tape & Reel 8-Lead SOIC IRS2540STRPbF Tape & Reel 8-Lead SOIC IRS2541STRPbF This product has been designed and qualified for the industrial level. ...

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