HT7L4811 SOT23-6

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شناسه : HT7L4811-SOT23-6 دسته‌بندی: برچسب ها: , , , , , , , ,

The HT7L4811 is a non-isolation buck PWM controller for LED lighting applications. The device has a fully integrated PFC circuit which operates in a boundary conduction mode (BCM) to achieve high power factor values. With good control over external MOSFETs, the device can easily meet exacting LED current and high power factor requirements. The HT7L4811 provides several protection functions, which include VCC Under Voltage Lockout (UVLO), Over Current Protection (OCP), Output LED String Open Protection, Output LED String Short Protection, VCC Over Voltage Protection (OVP) and Leading-Edge Blanking (LEB) for current sensing. Additionally and to ensure system reliability, the device includes a fully integrated thermal protection function. To protect the external power MOSFET from being damaged by a supply over voltage, the device DRV pin voltage is clamped to about 17V.

The high level of functional integration minimises the external component count giving major advantages in terms of cost and circuit board area. The device is supplied in a SOT23-6 package.

Features

Tiny package SOT23-6
Non-isolation buck topology
Low BOM Cost
Wide AC input range – from 85VAC to 265VAC
High Power Factor of >0.9 without additional circuitry
Accurate constant current (< ±3%)
Low start-up current which reduces power dissipation
Full protection functions for enhanced safety
– Gate driver output voltage clamp
– VCC over voltage protection (VCC OVP)
– VCC under-voltage lockout with hysteresis (VCC UVLO)
– Output LED string over current protection
– Output LED string short protection
– Output LED string open protection
– On-chip over temperature protection (OTP)

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