HT7L5600 Datasheet, PDF (1/10 Pages) Holtek Semiconductor Inc – Primary side regulation off line LED driver with active PFC

HT7L5600
Primary side regulation off line
LED driver with active PFC
Features
• Small outline SOT23-6 package
• Primary-side current sensing and regulation with-
out an opto-coupler
• 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 / open protection}
♦♦ _{On-chip over temperature protection – OTP}
Applications
• General illumination
• E26/27, T5/T8 LED Lamp
• Other LED Lighting Applications
General Description
The HT7L5600 is a single-stage, isolated, primary-
side offline LED lighting controller that achieves a
high power factor. Power control is implemented by
controlling an external MOSFET and accurate LED
constant current regulation from the primary-side
information. This can significantly simplify the LED
lighting system design by eliminating the secondary-
side feedback components and the normally required
opto-coupler. The extremely low start-up current and
quiescent current reduces the total power consump-
tion to provide a high efficiency solution for lighting
applications.
The HT7L5600 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 an over voltage, the device DRV pin voltage is
clamped to about 16V.
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.
Application Circuits
ACIN
VOUT+
VOUT-
COMP ZCD
GND
VCC
CS
DRV
HT7L5600
Rev. 1.11
1
August 17, 2016