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  Holtek Semiconductor Electronic Components Datasheet  

HT7L2102 Datasheet

High Efficiency Dimmable LED Lighting Driver

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HT7L2102
Anti-EMI, High Efficiency Dimmable
LED Lighting Driver with Green Mode
and Integrated Protections
Feature
• Frequency Jitter for EMI Restriction
• Integrated Soft-Start Function
• Very Low Operating Current and Start-up Current
(<20mA) for satisfying Energy-Star 2.0 "No-Load
Mode" (Stand-by) Power standard
• ±5% Trimmed Oscillator for Precise Frequency
• Non-Audible-Noise Green Mode Control to
maintain efficiency for both Light and Heavy
Loads
• LEB (Leading-Edge Blanking) on CS Pin
• Internal Slope Compensation
• Cycle-by-Cycle Current Limiting
• Short-Circuit-Protection(SCP) for Short-Circuit
and Over-Load Condition
• Over-Voltage-Protection(OVP) on VCC Pin
• Over-Temperature-Protection(OTP) on TS pin for
External Thermistor Sensing
• 1~99% PWM Dimming Range
• 8-pin SOP package
Applications
• Isolation AC-DC LED Lighting
• AC-DC Switching Power Supply/Adapter
General Description
The HT7L2102 is an advanced, highly integrated LED
Lighting driver using an AC-DC isolation topology.
The device provides many protection functions and
uses ultra low power circuit design, and is optimized
to restrict EMI. By integrating a Non-Audible Noise
Green Mode Control Structure, users can implement
a single circuit for different LED load levels for
various series/parallel configurations but still maintain
high efficiency for different load conditions. This
device also integrates various protection functions for
LED Lighting requirements such as Cycle-by-Cycle
Current Limiting, Short-Circuit Protection (SCP),
Over-Voltage Protection (OVP), Over-Temperature
Protection (OTP) for external thermistor sensing, and
a Soft-Start function to reduce inrush currents during
LED power system initialization for the prevention of
device burn-out.
The HT7L2102 provides a 1~99% PWM Dimming
Range with duty-cycle scale precision lower than 1%.
Application Circuits
L
Vac=85V~265V
BD1
N
C2
R7 C14
U1
VCC
D3
Vref
C15
C12
R11
Rts
GD
RT
ISENSE
TS
COMP/FB
GND
C19
T1
1
R3
R4
D4
3
4
7
8
D1
5
Q1
R19
R20
U2
Q3
Rev. 1.00
1
Vout
C4
R28
November 4, 2011
Datasheet pdf - http://www.DataSheet4U.net/


  Holtek Semiconductor Electronic Components Datasheet  

HT7L2102 Datasheet

High Efficiency Dimmable LED Lighting Driver

No Preview Available !

www.DataSheet.co.kr
HT7L2102
Block Diagram
VCC 7
RT 4
VREF
8
OVP
UVLO
32V
14V / 8V
Internal Bias
& Vref
Soft-Start
Green Mode
OSC
TS 2
FB/PDM 1
ISENSE 3
107uA Temperature
Sense
Frequency
Jitter
Slope
Compensation
LEB
350ns
Constant
Current
Controller
FB Compare Level = 2.5V
OTP
SCP
OCP
OCP Level = 1V
SQ
R
Driver
Stage
VCC
Pin Assignment
6 GD
5 GND
F B /P D M
TS
IS E N S E
RT
18
27
36
45
H T7L2102
8 S O P -A
VREF
VCC
GD
GND
Pin Description
Pin No.
1
2
3
4
5
Pin Name
Description
FB/PDM
TS
ISENSE
RT
Voltage Feedback Pin. Connected to a Photo-Coupler for closed-loop control. This pin also
can be used as a PWM Dimming Pin.
Temperature Sense Pin. Connected to an external thermistor as a sense system hot point.
This pin also can be used for an external System-Latch.
A voltage proportional to the inductor current is connected to this input. The Constant
Current Controller uses this voltage information to keep the system output current within a
narrow range.
The oscillator frequency is programmed by connecting a resistor RT between this pin and
ground. A maximum frequency of 500KHz is possible.
GND Combined control circuitry and power ground.
6 GD Power MOSFET gate driver output.
7 VCC Positive Supply.
8 VREF A Temperature-Independent Voltage Reference output.
Absolute Maximum Ratings
Supply Voltage VCC �������������������������������������������������������������������������������������������������������������������������������� -0.3V~30.0V
FB/PDM, RT, ISENSE, TS Pins ���������������������������������������������������������������������������������������������������������������� -0.3V~5.5V
Junction Temperature ������������������������������������������������������������������������������������������������������������������������������������������ 150°C
Operating Ambient Temperature ��������������������������������������������������������������������������������������������������������������� -40°C~85°C
Storage Temperature Range �������������������������������������������������������������������������������������������������������������������� -65°C~150°C
Package Thermal Resistance (8-Pin SOP) ����������������������������������������������������������������������������������������������������� 160°C/W
ESD Protection:
Human Body Model ��������������������������������������������������������������������������������������������������������������������������������������3kV
Machine Model �������������������������������������������������������������������������������������������������������������������������������������������200V
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.
Rev. 1.00
2 November 4, 2011
Datasheet pdf - http://www.DataShee


Part Number HT7L2102
Description High Efficiency Dimmable LED Lighting Driver
Maker Holtek Semiconductor
Total Page 11 Pages
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