HT7L2102 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Green Mode and Integrated Protections

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-DCSwitching 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
D3
VCC
Vref
C15
C12
GD
RT
R11
ISENSE
TS
Rts
COMP/FB
GND
C19
T1
D1
1
7
R3
R4
8
D4
3
4
5
Q1
R19
R20
U2
Q3
Rev. 1.00
1
Vout
C4
R28
November 4, 2011