Lighting Driver. HT7L4815 Datasheet

HT7L4815 Driver. Datasheet pdf. Equivalent

HT7L4815 Datasheet
Recommendation HT7L4815 Datasheet
Part HT7L4815
Description Non-isolation Buck LED Lighting Driver
Feature HT7L4815; HT7L4815 Non-isolation Buck LED Lighting Driver with Active PFC Features • Non-isolation buck topo.
Manufacture Holtek Semiconductor
Datasheet
Download HT7L4815 Datasheet




Holtek Semiconductor HT7L4815
HT7L4815
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 short protection
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 HT7L4815 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



Holtek Semiconductor HT7L4815
HT7L4815
Pin Assignment
VSS
COMP
VCC
ZCD
18
27
36
45
HT7L4815
8 SOP-A
CS
CS
DRAIN
DRAIN
Pin Description
Pin No.
1
2
3
4
5, 6
7, 8
Symbol
VSS
COMP
VCC
ZCD
DRAIN
CS
Description
Ground pin.
Loop compensation pin. A capacitor is placed between COMP and GND.
Power supply pin.
Zero-current detect pin.
Internal high voltage power MOSFET drain terminals.
Current sense pin. A resistor is connected to sense the MOSFET current.
Absolute Maximum Ratings
Parameter
Internal MOSFET drain source voltage
VCC supply voltage
CS pin Input voltage
COMP pin Output voltage
ZCD pin Maximum current
Maximum operating junction temperature
Storage temperature range
Range
-0.3V to 500V
-0.3V to 33V
-0.3V to 6V
-0.3V to 6V
3mA (source), 3mA (sink)
150°C
-55°C to 150°C
Recommended Operating Ranges
Parameter
VCC Supply voltage
Operating junction temperature
Output power
Range
17V~25V
-40°C~125°C
18.3W@300mA, 90~264Vac
21W@300mA, 180~264Vac
Rev. 1.00
2 June 26, 2015



Holtek Semiconductor HT7L4815
Electrical Characteristics
Symbol
Parameter
Test Condition
Power Supply (VCC Pin)
VCCON UVLOON
VCCOFF UVLOOFF
VCCHYS UVLO Hysteresis
VOVP
VCC OVP Trip Point
ISTART Start-up Current
Before turn-on,
@ VCC=UVLOON - 1V
IQ Quiescent Current
No switching
Error Amplifier
VFB Feedback Reference Voltage
Ta=25°C
Current Sense Comparator
TLEB Leading Edge Blanking Time
VCL Current Limit Threshold
VOCP
Over Current Trip Point
Over Current Release Point
Zero Current Detector
VZCDH Upper Clamp Voltage
IZCD=300μA
VZCDL Lower Clamp Voltage
IZCD=-2.5mA
VZCDA Positive-Going Edge
VZCDT Negative-Going Edge
IOVP OVP Current on ZCD pin
TB_OVP Blanking Time for OVP Detection
Starter
TSTART Start Timer Period
TOFF Minimum Off Time
Over Temperature Protection
OTP Over Temperature Trip Point
Power MOSFET
RDS Power MOSFET Switch ON Resistance @ VGS=10V, IDS=0.5A
BVDSS Power MOSFET Drain-Source Voltage @ VGS=0V, IDS<250μA
HT7L4815
VCC=18V, Ta=25°C
Min Typ Max Unit
— 18 — V
— 10 — V
7 — —V
26 29 32 V
— 10 20 μA
— 0.6
1 mA
194 200
206 mV
— 400 — ns
— 1.1 — V
— 0.9 — V
— 0.2 — V
— 3 —V
— -0.2 — V
— 1.5 — V
— 1 —V
270 300
330 μA
— 1 — μs
— 40 — μs
— 4 — μs
— 150 — °C
— 2.5 — Ω
500 —
—V
Rev. 1.00
3 June 26, 2015







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