Diodes AP1684 User Manual
AP1684
Document number: DS36547 Rev. 3 - 2
1 of 13
www.diodes.com
February 2014
© Diodes Incorporated
AP1684
A Product Line of
Diodes Incorporated
Description
The AP1684 is a high performance AC/DC power factor corrected
LED driver controller which is driving high voltage bipolar transistor.
The device uses Pulse Frequency Modulation (PFM) technology to
regulate output current while achieving high power factor and low
THD. It operates as a boundary condition mode (BCM) buck controller
which is good for EMI.
The AP1684 provides accurate constant current (CC) regulation while
removing the opto-coupler and secondary control circuitry. It also
eliminates the need of loop compensation circuitry while maintaining
stability. It can meet the requirement of IEC6100-3-2 harmonic
standard.
The AP1684 features low start-up current, low operation current and
high voltage driving bipolar transistor. It adopts dynamic base driver
control technology and valley on switching mode to achieve high
efficiency. It also has rich protection features including over voltage,
short circuit, over temperature protection.
The AP1684 is available in SO-8 package.
Applications
LED Bulb Lamp
LED Down Light
GU10/E27
Other Non-dimmable LED Lighting
Pin Assignments
(Top View)
1
2
3
4
8
7
6
5
NC
RI
RM
CS
FB
GND
OUT
VCC
(SO-8/ M Package)
Features
Low Start-up Current
High PF and Low THD (PF > 0.9, THD < 30%)
High Efficiency up to 92%
BCM Mode
Output Current Accuracy on IC Level: ±2%
Tight LED Open Voltage
Valley-mode Switching to Minimize the Transition Loss
BJT Transistor Driver
Dynamic Base Driver Control
Open-load and Reload Detection
Internal Protections:
Under Voltage Lock Out (UVLO)
Leading-edge Blanking (LEB)
Output Short Protection
Output Open Protection
Over Temperature Protection
Low System Cost
SO-8 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
T1
OUT
+
VCC
FB
OUT
CS
GND
C 3
R7
R5
R6
R4
D1
C4
R3
Q1
AC
Input
F 1
VR1
DB1
C2
L1
C1
R8
D2
R1
R2
RI
RM
R9
AP
1684
5
7
4
6
3
2
8
AC/DC, HIGH PF, HIGH EFFICIENCY LED DRIVER CONTROLLER
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
AP1684
Document number: DS36547 Rev. 3 - 2
2 of 13
www.diodes.com
February 2014
© Diodes Incorporated
AP1684
A Product Line of
Diodes Incorporated
Pin Number
Pin Name
Function
1
NC
No connection 2 RI
The initial Tonp tuning resistor
3
RM
Set the operating mode
4
CS
Primary current sensing
5
FB
The feedback voltage sensing from the auxiliary winding
6
GND
Ground
7
OUT
Gate driver output
8
VCC
Supply voltage of gate driver and control circuits of the IC
Regulator &
Bias
Tons
Detector
Tons
Power_EN
Driver
FB
VCC
OUT
PFM
R
S
Q
Vref
CC_CTRL
TONP_CTRL
CS
GND
Vdd
Protection
& Latch
PRO
CS_OCP
FB_CV
FB_OVP
VCC_OVP
Logic
Set Initial Tonp
& Set the IC
Working in BCM
RM
RI
Constant Turn-on Time
Generation
5
2
3
4
6
7
8
Pin Descriptions
Functional Block Diagram
AP1684
Document number: DS36547 Rev. 3 - 2
3 of 13
www.diodes.com
February 2014
© Diodes Incorporated
AP1684
A Product Line of
Diodes Incorporated
Symbol
Parameter
Rating
Unit
VCC
Power Supply Voltage
-0.3 to 35
V
I
OUT
Driver Output Current
150
mA
VCS
Voltage at CS to GND
-0.3 to +7
V
VFB
FB Input Voltage
-40 to +10
V
TJ
Operating Junction Temperature
-40 to +150
°C
T
STG
Storage Temperature
-65 to +150
°C
T
LEAD
Lead Temperature (Soldering, 10 sec)
+300
°C
PD
Power Dissipation (TA = +50°C)
0.65
W
JA
Thermal Resistance (Junction to Ambient)
160
°C/W
–
ESD (Human Body Model)
2000
V
–
ESD (Charged-device Model)
±1000
V
Symbol
Parameter
Min
Max
Unit
VCC
Power Supply Voltage
7
25
V
TA
Ambient Temperature
-40
+105
°C
Absolute Maximum Ratings (@T
= +25°C, unless otherwise specified. Note 4)
A
Note 4: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to
“Absolute Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
AP1684
Document number: DS36547 Rev. 3 - 2
4 of 13
www.diodes.com
February 2014
© Diodes Incorporated
AP1684
A Product Line of
Diodes Incorporated
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
UVLO Section
V
TH
(ST)
Start-up Threshold
–
18
19
20
V
V
OPR
(Min)
Minimum Operating Voltage
After turn on
5.5
6.5
7.5
V
V
CC_OVP
VCC OVP Voltage
–
30
32
34
V – VCC Delatch Voltage (Note 5)
–
3 4 5
V
Standby Current Section
IST
Start-up Current
V
CC
= V
TH
(ST)-0.5V,
Before start up
– – 20
μA
ICC (OPR)
Operating Current
Static – 900
1300
μA
Drive Output Section
I
OUT
Output Current (Note 5)
V
CS_PEAK
= 1V
– – 60
mA
VOS
UVLO Saturation Voltage
V
CC
= 0 to V
CC-ON
, I
SINK
= 10mA
– – 1.1
V
Current Sense Section
V
CS_REF
Current Sense Reference
–
– 1 –
V
V
CS_CLAMP
Current Sense Reference
Clamp
–
1.2
1.4 – V
t
ONP_MIN
Minimum t
ONP
–
700 – 1000
ns
t
D(H-L)
Delay to Output (Note 5)
–
50
150
250
ns
Feedback Input Section
IFB
Feedback Pin Input Leakage
Current
V
FB
= 2V
–
–
4
μA
V
FB_CV
FB CV Threshold
–
3.8 4 4.2
V
V
FB_OVP
FB OVP Threshold
–
4.5 6 7.5
V
Output Current
–
System Output Current on Final
Test Board
–
– – ±2
%
Over Temperature Protection Section
–
Shutdown Temperature (Note 5)
–
+150 – –
°C
–
Temperature Hysteresis (Note 5)
– – +20 – °C
Electrical Characteristics (@T
= +25°C, unless otherwise specified.)
A
Note 5: These parameters, although guaranteed by design, are not 100% tested in production.
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