HT7L4813 Datasheet, PDF (1/10 Pages) Holtek Semiconductor Inc – Non-isolation Buck LED Lighting Driver with Active PFC

HT7L4813
Non-isolation Buck LED
Lighting Driver with Active PFC
Features
• Non-isolation buck topology
• Integrated 500V MOSFET
• 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 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 shortprotection
♦♦ Output LED string open protection
♦♦ On-chip over temperature protection – OTP
• Package: 8-pin SOP
Applications
• General illumination
• E26/27, T5/T8 LED Lamps
• Other LED Lighting Applications
General Description
The HT7L4813 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. A high voltage power MOSFETs
is integrated in the device. With full control provided
over the internal MOSFETs, the device can easily
meet the exacting LED current and high power factor
requirements.
The device 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.
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 8-pin SOP package.
Block Diagram
VCC 3
ZCD 4
COMP ²
UVLO
VCC OVP
OTP
OCP
ZCD OVP
ZCD
Comparator
Min
Off Time
PWM
Generator
EA
0.2V
Starter
Reference
& Bias
OTP
OTP
Logic
Control
Driver
OCP
LEB
OCP
1
VSS
5,6 DRAIN
7,8 CS
Rev. 1.00
1
June 26, 2015