Data Sheet No. PD60293
IRS254(0,1)(S)PbF
LED BUCK REGULATOR CONTROL IC
Description
The IRS254(0,1) are high voltage, hi...
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 opencircuit 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
8-Lead PDIP IRS254(0,1)PbF
8-LeadSOIC IRS254(0,1)SPbF
Typical Application Diagram
VBUS L2 VOUT + RS1 RS2 DBOOT
IC1 CVCC1 ROV1 CBUS2 CBUS1 DOV ROV2 CEN
ENN VCC COM
1 2
8 7 6 5
VB
IRS254(0,1)
HO
RG1 CBOOT
DCLAMP
CVCC2
M1 L1
IFB
3 4
VS
LO
M2 RG2 COUT VOUT -
RF
RCS ROUT CF COM EN DEN1
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IRS254(0,1)(S)PbF
Alternate application circuit using a single
MOSFET
IRS254(0,1)
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IRS254(0,1)(S)PbF
Absolute Maximum Ratings
Absolute...