CRMICRO Primary Agent DC to DC Buck constant current drive IC PT4121

Model：: PT4121

Brand：: CRMICRO

Batch No：: PT4121E23F,PT4121ESOH,PT4121EESH

Desc：: PT4121 LED driver

Stock：: 0 PCS

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Switching frequency :	1MHz
Current accuracy :	3%
Efficiency :	97%
Mosfet :	外置MOS管
Dimming mode :	PWM調(diào)光
Typical applications :	低壓射燈、車燈、信號燈
Output voltage :	3~30Vdc
Replacement models :	QX5241
Package :	SOT23-6
Topological :	降壓DC-DC外置MOS
LED serial number :	6W*10
Max. power output :	60W
Max. Output Current :	6A
Input voltage :	6~60Vdc
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?PT4121 Buck LED Driver Controller – High-Efficiency Constant Current Solution?

?Overview?

The PT4121 is a ?buck-mode constant current controller? designed to drive ?single or multiple series-connected LEDs? in ?continuous inductor current (CCM) operation?. With an ?input voltage range of 6V to 60V? and adjustable output current, it delivers ?high efficiency (up to 97%)? and ?precise current regulation (±3% accuracy)?.

Featuring ?high-side current sensing?, the PT4121 supports ?analog dimming? and ?wide-range PWM dimming? via its ?DIM pin?. When the DIM voltage drops below ?0.3V?, the device enters ?ultra-low standby current mode?, minimizing power consumption.

Available in ?SOT23-6, SOP-8, and ESOP-8 packages?, the PT4121 is ideal for ?automotive, industrial, and consumer LED lighting applications?.

?Key Features?

? ?Minimal external components? – Simplifies PCB design

? ?Wide input voltage range (6V–60V)? – Supports 12V/24V automotive & industrial systems

? ?High efficiency (up to 97%)? – Reduces power loss & heat generation

? ?Multi-function DIM pin? – Supports ?ON/OFF control, analog dimming, and PWM dimming (0–100%)?

? ?1MHz switching frequency? – Enables compact inductor & capacitor selection

? ?Adjustable constant current output? – Flexible LED driving capability

? ?High-side current sensing? – No compensation required (hysteretic control)

? ?Robust protection features? – ?LED open/short protection, RCS open protection, and thermal shutdown (150°C)?

?Applications?

? ?Low-voltage LED spotlights? (replacement for halogen lamps)