HT7L2103 Anti-EMI, High Efficiency Dimmable LED

HT7L2103
Anti-EMI, High Efficiency Dimmable
LED Lighting Driver with Primary-Side
Constant Control and Green Mode
Feature
Applications
• Frequency Jitter for EMI Restriction
• AC-DC Switching Power Supply/Adapter
• Integrated Soft-Start Function
• Very Low Operating Current and Start-up Current
(<20mA) for satisfying Energy-Star 5.0 "No-Load
Mode" (Stand-by) Power standard
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/ BuckBoost. This device also integrates various protection
functions for adapter requirements such as Cycleby-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.
• ±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
The HT7L2103 provides a 1~99% PWM Dimming
Range with duty-cycle scale precision lower than 1%.
• 8-pin SOP package
Application Circuits
L
Vac=85V~265V
T1
BD1
1
C2
N
D1
Vout
7
R3
R7
C14
C4
R4
8
D4
3
U1
R13
R14
MF
D3
VCC
C12
COMP/FB
C16
R12
Vref
5
Q1
GD
R19
HT7L2103
C15
4
ISENSE
RT
R11
GND
Rev. 1.10
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August 23, 2012
HT7L2103
Block Diagram
Pin Assignment
VREF
8
VCC
7
UVLO
OVP
32V
RT
Internal Bias
& Vref
VCC
Soft-Start
14V / 8V
Green Mode
OSC
4
Driver
Stage
2
FB/PDM
1
ISENSE
3
Multi-Function
Interface
Constant
Current
Controller
LEB
350ns
GD
5
GND
S Q
R
MF
6
Frequency
Jitter
Slope
Compensation
Internal OTP
SCP
OCP
OCP Level = 1V
FB Compare Level = 2.5V
Pin Description
Pin No.
Pin Name
Description
1
FB/PDM
Voltage Feedback Pin. Connected to a Photo-Coupler for closed-loop control. This pin also
can be used as a PWM Dimming Pin.
2
MF
3
ISENSE
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.
4
RT
The oscillator frequency is programmed by connecting a resistor RT between this pin and
ground. A maximum frequency of 500KHz is possible.
5
GND
6
GD
7
VCC
Positive Supply.
8
VREF
A Temperature-Independent Voltage Reference output.
Multi-Function Pin. By Connecting this pin to different system sensing points, the
HT7L2013 can be used for different circuit topologies such as Isolation Flyback or NonIsolation DC-DC Buck/Boost/Buck-Boost.
Combined control circuitry and power ground.
Power MOSFET gate driver output.
Absolute Maximum Ratings
Supply Voltage VCC�������������������������������������������������������������������������������������������������������������������������������� -0.3V~30.0V
FB/PDM, RT, ISENSE Pins����������������������������������������������������������������������������������������������������������������������� -0.3V~5.5V
MF Pin������������������������������������������������������������������������������������������������������������������������������������������������������� -0.3V~5.0V
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. 1.10
2
August 23, 2012
HT7L2103
Electrical Characteristics
Unless otherwise stated, this specifications apply for 0°C ≤ Ta ≤ 70°C, VCC=15V, RT=10kW
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Supply Voltage (VCC Pin)
Startup Current
IST
VCC=12.9V
—
12
30
mA
VFB/PDM=0V
—
2.0
3.0
mA
mA
ICC
Operating Current
—
2.5
—
VTL
UVLO (Off)
—
7
8
9
V
VTH
UVLO (On)
—
13
14
15
V
VCC
OVP Trip Level
26.5
28.0
29.5
V
tD-OVP
OVP Strobe Time
—
100
—
ms
VFB/PDM=3V
VCC(Over Voltage Protection)
—
Voltage Reference (VREF Pin)
VREF
Output Voltage
Tj=25°C, IO=1mA
—
5.5
—
V
∆VREF
Line Regulation
12V ≤ VCC ≤ 25V
—
3.0
20
mV
∆VREF
Load Regulation
1mA ≤ IO ≤ 10mA
—
4.0
25
mV
Current Sensing (ISE NSE Pin)
VIS(OFF)
Maximum Input Voltage
—
0.9
1.0
1.1
V
tLEB
Leading Edge Blanking Time
—
—
350
—
ns
Delay to Output
—
—
100
—
ns
Oscillator (RT pin)
Oscillator Frequency
Tj=25°C, RT=10kW to GND (see note *)
49
52
55
kHz
∆fOSC
∆TA
Temperature Stability
-40°C ~105°C
—
5.0
—
%
∆fOSC
∆VREF
Voltage Stability
VCC=10V~25V
—
0.2
1.0
%/V
fOSC
DMAX
Maximum Duty
—
—
75
—
%
Frequency Jitter
—
—
±4
—
%
V
Gate Drive Output (GD Pin)
VOL
Output Low Level
VCC=15V, Isink=20mA
—
—
1
VOH
Output High Level
VCC=15V, Isource=20mA
9.0
—
—
V
tr
Rising Time
Tj=25°C, Load Capacitance=1nF
—
50
150
ns
tf
Falling Time
Tj=25°C, Load Capacitance=1nF
—
50
150
ns
Voltage Feedback (FB/PDM Pin)
ISINK
Short Circuit Current
VFB/PDM=0V
—
1.5
2.2
mA
VFB/PDM
Open Loop Voltage
FB/PDM pin open
—
5.5
—
V
SCP (Short Circuit Protection)
VFB/PDM
SCP Trip Level
VFB/PDM (SCP)
—
4.7
—
V
SCP Delay Time (See Note)
fS=52kHz
—
75
—
ms
Soft-Start Time
RT=10kW
—
10
—
ms
Soft-Start
tSTART
Internal OTP(Over Temperature Protection)
tPOn
OTP Trigger Temperature
—
150
—
°C
tP-Hys
OTP Temperature Hysteresis
—
30
—
°C
Multi-Function Pin
VREFA
Reference Voltage
VFB/PDM=2.5V
2.42
2.50
2.58
V
ISINKA
Output Sink Current
VFB=2.7V, VFB/PDM=1.1V
2.0
7.0
—
mA
ISOURCEA
Output Source Current
VFB=2.3V, VFB/PDM=4.8V
-0.5
-1.0
—
mA
VOHA
VFB/PDM High Voltage
VFB=2.3V, RL=15kW to GND
4.8
5.0
—
V
VOLA
VFB/PDM Low Voltage
VFB=2.3V, RL=15kW to VREF
—
0.8
1.1
V
AVO
DC Gain
—
150
—
dB
Note: These Parameters, although guaranteed, are not 100% tested in production.
"*" Suggest to limit switching frequency under 75kHz for Green Mode operation.
Rev. 1.10
3
August 23, 2012
HT7L2103
Typical Performance Characteristics
Figure 1. UVLO (on) (V) vs Temperature
Figure 2. UVLO (off) (V) vs Temperature
Figure 3. Frequency vs Temperature
Figure 4. Frequency vs VCC
Figure 5. VFB/PDM for SCP vs Temperature
Figure 6. Green Mode Frequency vs VCC
Rev. 1.10
4
August 23, 2012
HT7L2103
Application Information
Operation Overview
The HT7L2013 is a highly functionally integrated
PWM controller for LED lighting and is optimized to
restrict EMI. The device uses a primary side feedback
design with constant current control to reduce external
component requirements and to maintain current
accuracy. It is recommended for E27 retrofit lamp
use. The PWM dimming range is 1% to 99% and
provides less than 1% dimming precision. Its internal
features include Green mode (Non-Acoustic-Noise),
internal slope compensation, high efficiency under
different load conditions within a wide operating
temperature range of -40°C to 85°C. The devices
also includes a range of protection functions, SCP,
OVP, UVLO, current limit, LEB, soft start, OTP for
internal thermal sensing ,not only enhance system
excellent performance, but also ensure high stability
of the whole circuit application even under extreme
environmental conditions such as high temperature or
high EMI levels.
Figure 8. Oscillator Behavior Compared with
Advanced Precision Oscillator for
Green-Mode Switching and Non-Acoustic
Noise Requirement
HT7L2103 and Other Green Mode PWM Controller
Frequency Jitter for EMI Restriction
A Trimmed Precision Green Mode Oscillator is
implemented in the device to enhance the conversion
efficiency under light load conditions. As Figure 7
shows, the efficiency difference between light loads
and heavy loads is less than 1%, while the average
efficiency is only 89.5%, the peak efficiency is 90%.
EMI restriction is accomplished using a Frequency
Jitter function, which spreads the energy over a wider
frequency range than the bandwidth measured by
the EMI test equipment. An internal Frequency Jitter
circuit changes the switching frequency between +4%
and -4% of the central frequency with a period of
4ms.
Figure 7 Efficiency Performance between
Light-Load and Heavy-Load
The Green Mode Oscillator types supplied by other
PWM Controller providers are plagued by AcousticNoise problems. This is because, under light load
conditions, the frequency will keep decreasing
through the Human Acoustic Range (from 20Hz
to 20kHz), and these audio frequencies may create
audible noise in the transformer. Holtek’s HT7L2103
patented Green Mode Oscillator designed using an
advanced Non-Acoustic Noise structure prevents
the generation of frequencies in the audio frequency
band, thus eliminating any transformer noise.
Rev. 1.10
Figure 9 Frequency Jitter Function Spreads Energy
Over a Period to Accomplish EMI Restraining
5
August 23, 2012
HT7L2103
Under Voltage Lockout (UVLO)
Internal Slope-Compensation
An UVLO comparator is implemented in to ensure
that the device is fully functional before the output
stage is enabled. As shown in Fig. 10, a hysteresis
is provided to prevent the PWM Controller from
shutting down during any voltage dips which might
occur during startup process. The turn-on and turnoff threshold levels are set at 16.0V and 10.0V,
respectively.
An important issue with the current mode control
structures is the instability due to Sub-Harmonic
Oscillation when the Duty-Cycle > 50%. To prevent
this problem from occurring, a Slope-Compensation
function is always necessary. In traditional current
mode PWM Controller application, many external
components are necessary to implement a SlopeCompensation function, However in the HT7L2103
the internal Slope-Compensation eliminates the need
for these external components resulting in a simplified
the application circuit design.
Short-Circuit Protection (SCP) and
Over-Load Protection (OLP)
To protect all the devices in a system from being
damaged due to over load or short circuit conditions,
a smart SCP function is implemented in the device.
Here the feedback system will force the voltage loop
to move toward a saturation value and then pull up
the voltage on the COMP pin. Whenever the VCOMP
increases to the SCP threshold of 4.7V and remains
there for longer than 40ms, the protection scheme will
activate and then turn off the gate output to stop the
power circuit switching. By using such a protection
mechanism, the average input power can be reduced
to a very low level so that the component temperature
and stress can be controlled within safe operating
levels.
Figure 10. UVLO Scheme and Start-Up Current
Current Sense and Leading-Edge
Blanking (LEB)
A Leading-Edge Blanking Scheme is integrated in
the device to prevent false triggering due to feedback
current spikes which may appear on the CS pin,
further eliminating the need for an R-C filter which
is always a requirement in traditional current mode
PWM Controller applications.
Figure 12. SCP Function Behavior
Figure 11. LEB with R-C Filter Removed
Rev. 1.10
6
August 23, 2012
HT7L2103
VCC Pin Over-Voltage Protection (OVP)
Oscillator Frequency Tuning
VCC Over-Voltage Protection is integrated in the
device to prevent components damage due to over
voltage conditions on the VCC pin. The OVP is
triggered when VCC reaches 28V and lasts for 100ms,
The PWM pulses are disabled when OVP is enabled.
By choosing an appropriate value of an external
resistor between the RT Pin and GND, a suitable
operating frequency can be generated. The relationship
between the value of RT and the operating frequency
is provided in Figure 13.
Internal Over-Temperature Protection (OTP)
An Internal Over-Temperature Protection (OTP)
function is integrated in the device. When the device
junction temperature rises higher than the OTP
trigger level, the OTP Circuit will turn off the gate
drive output thus simultaneously switching off the
power MOSFET. The device will recover when the
temperature is below the OTP threshold whereupon
the PWM signal will resume operation.
Figure 13. RT Resistor value vs
Operating Frequency
Rev. 1.10
7
August 23, 2012
HT7L2103
Package Information
Note that the package information provided here is for consultation purposes only. As this information may be
updated at regular intervals users are reminded to consult the Holtek website (http://www.holtek.com.tw/english/
literature/package.pdf) for the latest version of the package information.
8-pin SOP (150mil) Outline Dimensions
MS-012
Symbol
Nom.
Max.
A
0.228
―
0.244
B
0.150
―
0.157
C
0.012
―
0.020
C'
0.188
―
0.197
0.069
D
―
―
E
―
0.050
―
F
0.004
―
0.010
G
0.016
―
0.050
H
0.007
―
0.010
α
0°
―
8°
Symbol
Rev. 1.10
Dimensions in inch
Min.
Dimensions in mm
Min.
Nom.
Max.
A
5.79
―
6.20
B
3.81
―
3.99
C
0.30
―
0.51
C'
4.78
―
5.00
D
―
―
1.75
E
―
1.27
―
F
0.10
―
0.25
G
0.41
―
1.27
H
0.18
―
0.25
α
0°
―
8°
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August 23, 2012
HT7L2103
Reel Dimensions
SOP 8N (150mil)
Symbol
Description
Dimensions in mm
A
Reel Outer Diameter
B
Reel Inner Diameter
100.0±1.5
C
Spindle Hole Diameter
13.0 +0.5/-0.2
D
Key Slit Width
T1
Space Between Flange
T2
Reel Thickness
Rev. 1.10
330.0±1.0
2.0±0.5
12.8 +0.3/-0.2
18.2±0.2
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August 23, 2012
HT7L2103
Carrier Tape Dimensions
 SOP 8N (150mil)
Symbol
Description
W
Carrier Tape Width
P
Cavity Pitch
E
Perforation Position
Dimensions in mm
12.0+0.3/-0.1
8.0±0.1
1.75±0.10
F
Cavity to Perforation (Width Direction)
5.5±0.1
D
Perforation Diameter
1.55±0.1
D1
Cavity Hole Diameter
1.50 +0.25/-0.00
P0
Perforation Pitch
4.0±0.1
P1
Cavity to Perforation (Length Direction)
2.0±0.1
A0
Cavity Length
6.4±0.1
B0
Cavity Width
5.2±0.1
K0
Cavity Depth
t
Carrier Tape Thickness
C
Cover Tape Width
Rev. 1.10
2.1±0.1
0.30±0.05
9.3±0.1
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August 23, 2012
HT7L2103
Holtek Semiconductor Inc. (Headquarters)
No.3, Creation Rd. II, Science Park, Hsinchu, Taiwan
Tel: 886-3-563-1999
Fax: 886-3-563-1189
http://www.holtek.com.tw
Holtek Semiconductor Inc. (Taipei Sales Office)
4F-2, No. 3-2, YuanQu St., Nankang Software Park, Taipei 115, Taiwan
Tel: 886-2-2655-7070
Fax: 886-2-2655-7373
Fax: 886-2-2655-7383 (International sales hotline)
Holtek Semiconductor (China) Inc. (Dongguan Sales Office)
Building No.10, Xinzhu Court, (No.1 Headquarters), 4 Cuizhu Road, Songshan Lake, Dongguan, China 523808
Tel: 86-769-2626-1300
Fax: 86-769-2626-1311, 86-769-2626-1322
Holtek Semiconductor (USA), Inc. (North America Sales Office)
46729 Fremont Blvd., Fremont, CA 94538, USA
Tel: 1-510-252-9880
Fax: 1-510-252-9885
http://www.holtek.com
Copyright© 2012 by HOLTEK SEMICONDUCTOR INC.
The information appearing in this Data Sheet is believed to be accurate at the time of publication.
However, Holtek assumes no responsibility arising from the use of the specifications described.
The applications mentioned herein are used solely for the purpose of illustration and Holtek makes
no warranty or representation that such applications will be suitable without further modification,
nor recommends the use of its products for application that may present a risk to human life due to
malfunction or otherwise. Holtek's products are not authorized for use as critical components in life
support devices or systems. Holtek reserves the right to alter its products without prior notification. For
the most up-to-date information, please visit our web site at http://www.holtek.com.tw.
Rev. 1.10
11
August 23, 2012