HT7L2103 Datasheet, PDF (1/11 Pages) Holtek Semiconductor Inc – Anti-EMI, High Efficiency Dimmable LED Lighting Driver with Primary-Side Constant Control and Green Mode

HT7L2103
Anti-EMI, High Efficiency Dimmable
LED Lighting Driver with Primary-Side
Constant Control and Green Mode
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 Precision Oscillator
• 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
• Internal Over-Temperature-Protection(OTP)
• 1~99% PWM Dimming Range
• 8-pin SOP package
Applications
• Isolation AC-DC LED Lighting
• AC-DC Switching Power Supply/Adapter
General Description
The HT7L2103 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 special
multi-function interface, this device can be used for
different LED power topologies such as Primary
Feedback Isolation Flyback, Secondary Feedback
Isolation Flyback, DC-DC Buck/Boost/ Buck-
Boost. 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),
Internal Over-Temperature Protection (OTP), and a
Soft-Start function to reduce inrush currents during
LED power system initialization for the prevention of
device burn-out.
The HT7L2103 provides a 1~99% PWM Dimming
Range with duty-cycle scale precision lower than 1%.
Application Circuits
L
Vac=85V~265V
N
BD1
C2 ^R7
T1
1
R3
C14
R4
D1
7
8
D4
3
R13
R14
C16
R12
U1
MF
VCC
COMP/FB
Vref
GD
HT7L2103
D3
4
5
C12
Q1
R19
C15
RT
R11
ISENSE
GND
Vout
C4
Rev. 1.00
1
November 04, 2011