Lighting Driver. HT7L4661 Datasheet

HT7L4661 Driver. Datasheet pdf. Equivalent

HT7L4661 Datasheet
Recommendation HT7L4661 Datasheet
Part HT7L4661
Description Active PFC Non-isolation Buck LED Lighting Driver
Feature HT7L4661; HT7L4661 Active PFC Non-isolation Buck LED Lighting Driver With Dimming Function Feature • Non-iso.
Manufacture Holtek Semiconductor
Datasheet
Download HT7L4661 Datasheet




Holtek Semiconductor HT7L4661
HT7L4661
Active PFC Non-isolation Buck LED
Lighting Driver With Dimming Function
Feature
• Non-isolation buck topology
• Wide AC input range − from 85VAC to 265VAC
• High Power Factor of >0.9 without additional
circuitry
• Internal 650V high voltage JFET for quick startup
• Provides 5V LDO output
• Accurate constant current (< ±3%)
• Includes linear dimming function
• Low operating current to maximise conversion
efficiency
• Under-voltage lockout with hysteresis
• Full protection functions for enhanced safety
– Maximum gate drive output 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
– CS, ZCD pins open protection
– On-chip Vver temperature protection − OTP
• Small 10-pin MSOP package
Applications
• General illumination
• E26/27, T5/T8 LED Lamp
• Other LED Lighting Applications
General Description
The HT7L4661 is a Buck converter controller using
quasi-resonant conversion technology. It can be used
for driving high-brightness LEDs with power factor
correction in off-line applications. The controller is
implemented by driving an external power MOSFET
and measuring and regulating a constant LED current.
Additional features in the device include a rapid high
voltage startup function and a 5V LDO output with a
1mA drive capability for external loads. There is also a
linear dimming function to adjust the LED illumination
level.
The device also includes multiple protection features
to protect it from fault conditions. These include
under-voltage lockout, over-current protection, Vcc
pin over-voltage protection and a ZCD pin over-
voltage protection for the output voltage. Additionally,
to ensure device reliability, there is also a fully
integrated thermal protection function.
Application Circuits
ACIN
VOUT+
VOUT-
12 3
HV N.C DRV
DIM
8
97
CS COMP
REG5V
6
5
GND
HT7L4661
4
VCC
10
ZCD
VSS
OUT
VCC
Controller
Rev. 1.20
1 June 26, 2015



Holtek Semiconductor HT7L4661
Block Diagram
VCC
HV
REG5V
ZCD
CS
LDO
OVP1
OVP2
OTP
OCP
Linear
Dimmimg
VCC
Clamping
Reference
& Bias
UVLO
Minimum
Off Time
ZCD
Comparator
HV
Start-up
Driver
Logic
Control
EA
Vref
Starter
PWM
Generator
LEB
DIM
COMP
GND
Pin Assignment
HV
NC
DRV
VCC
GND
1 10
29
38
47
56
HT7L4661
10 MSOP-A
ZCD
CS
DIM
COMP
REG5V
HT7L4661
DRV
Rev. 1.20
2 June 26, 2015



Holtek Semiconductor HT7L4661
HT7L4661
Pin Description
Pin No. Pin Name
Description
1 HV
High-Voltage startup pin. The HV pin is connected to the AC line voltage to provide the
charging current to the VCC capacitor.
2 NC
No Connection
3 DRV
Output to drive the external power MOSFET
4 VCC
5 GND
6 REG5V
7 COMP
8 DIM
9 CS
10 ZCD
Internal circuitry power supply pin. Must be bypassed with a capacitor to GND with value of
at least 10μF.
Ground
5V LDO output. Must be bypassed with capacitor to GND with value of at least 1uF.
Error amplifier output. A capacitor is placed between COMP and GND to provide a stable
frequency response.
Linear dimming input. Sets the current sense threshold as long as the voltage at this pin is
less than 3V.
Current sense pin. A resistor is connected here for MOSFET current sensing.
Zero-current detect pin. Input from auxiliary winding for zero-current detection and output
over-voltage sensing.
Absolute Maximum Ratings
VCC Supply Voltage ����������������������������������������������������������������������������������������������������������������������������������� -0.3V~33V
HV Voltage ������������������������������������������������������������������������������������������������������������������������������������������������ -0.3V~650V
DIM, CS,COMP, LDO Pins �������������������������������������������������������������������������������������������������������������������������� -0.3V~6V
ZCD pin Maximum current ������������������������������������������������������������������������������������������������ 3mA (source), 3mA (sink)
Maximum Junction Temperature ������������������������������������������������������������������������������������������������������������������������ 150°C
Storage Temperature Range �������������������������������������������������������������������������������������������������������������������� -55°C~150°C
Note: These are stress ratings only. Stresses exceeding the range specified under “Absolute Maximum Ratings”
may cause substantial damage to the device. Functional operation of this device at other conditions beyond
those listed in the specification is not implied and prolonged exposure to extreme conditions may affect
device reliability.
Recommended Operating Ranges
VCC Supply Voltage ������������������������������������������������������������������������������������������������������������������������������������ 9.5V~25V
Operating Junction Temperature ������������������������������������������������������������������������������������������������������������� -40°C~125°C
Rev. 1.20
3 June 26, 2015







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