AP1653AEM

[AP1653AEM]
-Preliminary-
AP1653AEM
PFC+constant current LED Driver IC
1. General Description
The AP1653 is a single-channeled white LED driver. It consists of an active PFC circuit that is constructed
by a non-inverting buck-boost converter and a constant current circuit. With a single coil and three N-ch
MOSFETs, the AP1653 can drive white LEDs which are connected by cascade connection. LED current is
dependent on the external resistance setting. The input voltage range is from AC85V to AC275V. LED
dimming is controlled by external DC signal ranging 0V to 5V, and up to 3% dimming in current ratio is
available. The AP1653 integrates a self power-up circuit, a 5V regulator circuit, LED open state protection,
LED short protection, over current protection for MOSFET, thermal shut down for the IC and undervoltage
lockout protection (UVLO) circuits. It is able to output an error state flag and supports enable inputs.
2.









Features
Output LED forward direction voltage (VF) by Non-Inverted PFC Buck-Boost Controlling
Power Supply
13.5V ~ 26V
Operation Temperature
−40 ~ 95°C
Current Controlling Accuracy
±3% (Does not include the variation of the sense resistor)
- The AC input voltage or LED forward voltage is changed, the output is stable.
Soft Start-up Function
DC Dimming
- 100% to 3% dimming of LED current is available by External DC Input
Protection
- Over Current Protection for external N-ch MOSFET
- Under Voltage Lock Output Function (UVLO) of the IC
- LED Open Protection Function
- LED Short Protection Function
- Thermal Shut Down of the IC
Harmonic Regulation
“JIS C 61000-3-2 Class C” Compliant
Package
24-pin TSSOP
Rev.0.6
2014/07
-1-
[AP1653AEM]
3.
Table of Contents
1.
2.
3.
4.
General Description ................................................................................................................................... 1
Features ...................................................................................................................................................... 1
Table of Contents ....................................................................................................................................... 2
Block Diagram ........................................................................................................................................... 3
■ Block Diagram......................................................................................................................................... 3
■ Functional Description ............................................................................................................................ 3
5. Ordering Guide .......................................................................................................................................... 3
6. Pin Configurations and Functions .............................................................................................................. 4
■ Pin Configurations ................................................................................................................................... 4
■ Pin Functions ........................................................................................................................................... 5
7. Absolute Maximum Ratings ...................................................................................................................... 6
8. Recommended Operation Condition.......................................................................................................... 6
9. Electrical Characteristics ........................................................................................................................... 7
■ Power Consumption ................................................................................................................................ 7
■ Start-up Block (HV pin) .......................................................................................................................... 7
■ VREF, Enable Block (VREF/ ENA pins) ............................................................................................... 7
■ PFC Control Block (CS/ FBN/ FBP/ COMP/ SS pins) ........................................................................... 7
■ High-side driver, Low-side Driver (BCK/ BOOT/ LX/ BST pins) ......................................................... 7
■ LED Current Control (SEN/ GD/ DIM/ FBN pins)................................................................................. 8
■ Protection Functions (OVP/ CS/ FBN/ VDD pins) ................................................................................. 8
10.
Functional Descriptions ......................................................................................................................... 9
■ Buck-boost PFC Converter...................................................................................................................... 9
■ LED Current Control Circuit / Driver ..................................................................................................... 9
■ Power-up Circuit ................................................................................................................................... 10
■ Soft-start Circuit .................................................................................................................................... 12
■ Internal Regulator Circuit (5V) ............................................................................................................. 12
■ Power-up Sequence ............................................................................................................................... 12
■ Protection Functions .............................................................................................................................. 13
■ Protection List ....................................................................................................................................... 14
11.
Recommended External Circuits.......................................................................................................... 15
12.
How to Set Peripheral Circuit Constant ............................................................................................... 16
13.
Package ................................................................................................................................................ 19
■ Outline Dimensions ............................................................................................................................... 19
■ Marking ................................................................................................................................................. 19
IMPORTANT NOTICE .................................................................................................................................. 20
Rev.0.6
2014/07
-2-
[AP1653AEM]
4.
Block Diagram
■ Block Diagram
VDD
Power Up
Circuit
HV
ENA
VREF
OVP
VREF
VDD
CS
FBN
SEN
Enable
Protection
Circuit
FLG
TSD
Zero
Detection
CS
BOOT
FF
High-side
Driver
BCK
LX
RAMP
Generator
Low-side
Driver
COMP
BST
VSS
FBP
FBN
Error Amp
PWM
Comparator
DIM
Constant
Current Driver
Constant
Current Control
SS
GD
SEN
Figure 1. AP1653 Block Diagram
■ Functional Description
BLOCK Name
Description
Power-up Circuit
VREF
Enable
Zero Detection
RAMP Generator
Error Amplifier
PWM Comparator
High-side Driver
Low-side Driver
Constant Current Circuit
and Driver
Protection Circuit
TSD
Power supply to the HV pin is charged to a capacitor connected to VDD via this
block to power-up.
A linear regulator that generates a 5V (typ) reference voltage from VDD.
External supply up to 3mA is accepted.
Buck-boost PFC converter and constant current circuit are powered up by
setting the ENA pin = “H”.
Zero detection of coil current is executed by this block for boundary conduction
operation of buck-boost PFC converter.
This block generates RAMP waveform for determining power-on period of the
buck-boost PFC converter.
Monitor the cathode voltage of LEDs, and output error amount by comparing
with the reference voltage.
Turn OFF the driver of buck-boost PFC converter by comparing a signal from
RAMP generator and a signal from error amplifier.
Driver circuit for High-side MOSFET of buck-boost PFC converter.
Driver circuit for Low-side MOSFET of buck-boost PFC converter.
This block keeps LED current constant by controlling an external MOSFET.
LED current can be changed by the voltage of the DIM pin. Soft start-up function
is available upon power-up.
Thermal Shut Down, UVLO, Over Voltage production (OVP, FBN), Over
Current Protection (OCPCS, OCPSEN).
Temperature Sensor for Thermal Shut Down Function
5.
AP1653AEM
Ordering Guide
Ta = -40~95℃
24-pin TSSOP
Rev.0.6
2014/07
-3-
[AP1653AEM]
6.
Pin Configurations and Functions
■ Pin Configurations
CS
1
24
OVP
BST
2
23
SS
VSS 3
22
COMP
VDD 4
21
FBN
20
GD
19
SEN
BOOT 7
18
DIM
8
17
VSS
BCK 9
16
FBP
NC 10
15
FLG
NC 11
14
VREF
HV 12
13
ENA
NC
5
NC
6
(Top View)
LX
Rev.0.6
2014/07
-4-
[AP1653AEM]
■ Pin Functions
No.
Pin
Name
I/O
1
CS
I
Current Detection Pin for Low-side External N-ch MOSFET
2
BST
O
Output Pin for Low-side External N-ch MOSFET Driver
This pin is pulled-down by 100kΩ internally.
3
VSS
PWR Ground Pin
4
VDD
PWR
5,6
NC
-
7
BOOT
8
LX
9
BCK
O
Output Pin for High-side External N-ch MOSFET Driver
10,11
NC
-
No Connection Pin.
This pin must not connect to anywhere. It is not connected internally.
12
HV
Function
Power Supply Pin
Connect a 47μF bypass capacitor between this pin and the VSS pin.
No Connection Pin.
This pin must not connect to anywhere. It is not connected internally.
PWR High-side Floating, Power Supply Offset Voltage Input Pin
PWR High-side Floating, Power Supply Absolute Voltage Input Pin
PWR High Voltage Power Supply Pin for Start-up
IC Enable Signal Input Pin
The AP1653 enters normal operation mode by inputting “H” level voltage and enters
standby mode by inputting “L” level voltage to the ENA pin. In standby mode, all
circuits except the power-up, regulator, reference voltage and thermal shut down
circuits are stopped.
Internal Regulator Output Pin
Connect a 10μF capacitor between this pin and the VSS pin.
Fault Flag Pin
This pin is an active-low open drain output pin. Over current, over voltage, UVLO or
thermal shut-down status is output.
Reference Voltage Setting Pin for Feedback Error Amplifier of White LED Cathode
Voltage
13
ENA
I
14
VREF
O
15
FLG
O
16
FBP
I
17
VSS
18
DIM
I
Dimming Control Analog Input Pin
19
SEN
I
Current Detection Pin for Constant Current
20
GD
O
External N-ch Power MOSFET Driver Pin for Constant Current
21
FBN
I
22
COMP
O
23
SS
O
24
OVP
I
PWR Ground Pin
Input Pin of Feedback Error Amplifier for White LED Cathode Voltage
Connect cathode pins of LED.
Feedback Error Amplifier Output Pin
Connect a CR circuit for phase compensation.
Soft Start-up Time Setting Pin
Connect a 1μF Capacitor.
Over Voltage Detection Pin
Rev.0.6
2014/07
-5-
[AP1653AEM]
7.
Absolute Maximum Ratings
Parameter
Symbol
min
max
Unit
HV pin Voltage (Note 1)
VHVMAX
-0.3
450
V
LX pin Voltage (Note 1)
VLXMAX
-0.3
450
V
BOOT, BCK pin Voltage (Note 1)
-0.3
VLXMAX + 30
V
VDD pin Voltage (Note 1)
VDDMAX
-0.3
30
V
BST pin Voltage (Note 1,Note 2)
VBSTMAX
-0.3
VDDMAX +0.3
V
GD pin Voltage (Note 1,Note 2)
VGDMAX
-0.3
VDDMAX +0.3
V
FBN pin Voltage (Note 1,Note 2)
VFBNMAX
-0.3
VDDMAX +0.3
V
VREF pin Voltage (Note 1)
VREFMAX
-0.3
6.0
V
Voltage for ENA, FLG, FBP, COMP, DIM, OVP, SS,
-0.3
VREFMAX +0.3
V
CS, SEN pins (Note 1, Note 3)
Allowable power dissipation (Note 4, Note 5, Note 6)
PD
1.15
W
Junction Temperature
Tj
-40
125
C
Storage Temperature Range
TSTG
-55
150
C
Note 1. All voltages are with respect to ground (VSS pin).
Note 2. The maximum value is limited to 30V when “VDDMAX” exceeds 29.7V.
Note 3. The maximum value is limited to 6V when “VREFMAX” exceeds 5.7V.
Note 4. This value declines by 11.5mW/°C in the condition that the temperature is over 25°C.
Note 5. 100 mm  100 mm, t=1.0mm CEM Single-sided Board.
Note 6. Thermal design should be designed in consideration with the calorific value of the internal regulator
as well as power supplies.
IC Power Dissipation
= VDD × IC Consumption Current 10mA+ VREF External Output [(VDD-VREF) × (-IVREF)]
WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal
operation is not guaranteed at these extremes. These are stress ratings only.
8.
Recommended Operation Condition
Parameter
Symbol
min
typ
max
Unit
HV pin Voltage (Note 7)
VHV
GND
400
V
LX pin Voltage (Note 7)
VLX
GND
400
V
BOOT pin Voltage (Note 7)
VB
VLX+10.3
VLX+ (VDD-0.7)
VLX+ 26
V
VDD pin Voltage Range (Note 7)
VDD
11
15
26
V
BST pin Voltage Range (Note 7)
VBST
GND
VDD
V
GD pin Voltage Range (Note 7)
VGD
GND
VDD
V
FBN pin Voltage Range (Note 7)
VFB
GND
VDD
V
Voltage for ENA, FLG, FBP, COMP,
GND
VREF
V
DIM, OVP, SS, CS, SEN pins (Note 7)
Operating Temperature Range (Note 8)
Ta
-40
95
C
Note 7. All voltages are with respect to ground (VSS pin).
Note 8. It is a prerequisite that the operating ambient temperature may not exceed the absolute maximum
rating value of the junction temperature.
Rev.0.6
2014/07
-6-
[AP1653AEM]
Electrical Characteristics
9.
(Ta=25°C, VDD=15V, VREF=5V, ENA=DIM=VREF, VFBP=2.3V, CS=SEN=FBN=SS=OVP=LX=0V
(GND), BST=1000pF, BCK=1000pF, GD=300Ω/1000pF, HV=FLG=COMP=OPEN, unless otherwise
specified. Each current is defined as positive when it is input to the pin, and defined as negative when it
is output from the pin.)
■ Power Consumption
Parameter
Symbol
min
typ
mix
Unit
Condition
IDD1
IDD2
-
-
0.6
3.4
2.0
10.0
mA
mA
ENA=0V
f=60kHz
Power Consumption
■ Start-up Block (HV pin)
Parameter
Symbol
min
typ
max
Unit
Condition
HV Off Leak Current
IHV
ICHG1
ICHG2
ICHG3
VVDDH
VVDDL
-
-1.8
-19.0
-2.1
12.8
11.5
-
-1.0
-10.0
-1.1
15.0
13.5
5
-0.35
-3.5
-0.45
17.2
15.5
µA
mA
mA
mA
V
V
VHV=400V
VHV=100V, VDD=0V
VHV=100V, VDD=12.0V
VHV=100V, VREF=0V
Start-up
VDD Pin Charge Current
Start-up Current Stop Voltage
Start-up Current Reset Voltage
■ VREF, Enable Block (VREF/ ENA pins)
Parameter
VREF Voltage
VREF Voltage Drop
Over Voltage Protection
ENA Pin “L” Level Voltage
ENA Pin “H” Level Voltage
ENA Pin Pull-down Resistance
Symbol
VREF
VDROP
IVREFlimit
VEN1
VEN1
REN
min
4.7
-
6
0.8
2.5
200
typ
5.0
50
40
1.0
3.0
500
max
5.3
100
80
1.2
3.5
1000
Unit
V
mV
mA
V
V
kΩ
Condition
IVREF=0mA
IVREF= -3mA, ENA=0V
Condition
Disable
Enable
■ PFC Control Block (CS/ FBN/ FBP/ COMP/ SS pins)
Parameter
FBP Input Voltage Range
FBN Control Voltage
BCK, BST Maximum ON Period
Zero Detect Current
Zero Detect Delay
OFF BLANK
SS Charge Current
SS Discharge Current
BLANK
Symbol
min
typ
max
Unit
VFBP
VFBN
TONMAX
IZVS
ZVSDelay
TOFFBL
ISS
ISS_dis
TBLANK
2.0
-
4.0
V
-
25
0.7
1.8
2.6
1.6
6.4
200
2.3
28
1.0
3.0
4.45
2.0
8.0
330
-
31
1.3
4.2
6.3
2.4
9.6
500
V
µs
µA
µs
µs
µA
A
ns
FBP=2.3V
COMP = “H”
■ High-side driver, Low-side Driver (BCK/ BOOT/ LX/ BST pins)
Parameter
symbol
min
typ
max
Unit
Condition
BOOT、LX、BCK pin
Off Leak Current
VBL Power Standby Current
BCK Pin “H” level Voltage
BCK Pin “L” level Voltage
IFS
-
-
1
µA
VB=VLX=VBST=400V
IBL
VBCKH
VBCKL
-
BOOT-0.4
-
-
-
-
5.0
-
0.3
µA
V
V
BCK Pin Rising Time (Note 9)
trBCK
-
33
-
ns
VB=L
I=-10mA
I=10mA
Between BCK and LX
CL=1000pF
Rev.0.6
2014/07
-7-
[AP1653AEM]
Parameter
symbol
min
typ
max
Unit
BCK Pin Falling Time (Note 9)
tfBCK
-
27
-
ns
BCK Pin Pull-down Resistance
BST Pin “H” Level Voltage
BST Pin “L” Level Voltage
RBCK
VBSTH
VBSTL
40
VDD-0.4
-
100
-
-
200
-
0.3
kΩ
V
V
BST Pin Rising Time (Note 9)
trBST
-
33
-
ns
BST Pin Falling Time (Note 9)
tfBST
-
27
-
ns
BST Pin Pull-down Resistance
RBST
40
100
200
kΩ
Condition
Between BCK and LX
CL=1000pF
I=-10mA
I=10mA
Between BST and VSS
CL=1000pF
Between BST and VSS
CL=1000pF
Note 9. Reference value.
■ LED Current Control (SEN/ GD/ DIM/ FBN pins)
Parameter
SEN Pin Control Voltage
LED Drive Current
DIM Pin Input Voltage
Range
Symbol
min
typ
max
Unit
Condition
VSEN
ILED1
ILED11
ILED12
ILED13
VDIM1
VDIM2
VDIM3
0.2375
339.6
290.0
31.5
8.1
0.05
0.105
4.5
0.25
350
315
35
9.5
-
-
-
0.2625
360.6
340.8
38.5
11.0
0.09
3.5
-
V
mA
mA
mA
mA
V
V
V
DIM=VREF
RSEN=0.714Ω, DIM=VREF
ILED1=350mA, DIM=3.15V
ILED1=350mA, DIM=0.356V
ILED1=350mA, DIM=0.1V
LED OFF
DIM dimming range
LED MAX
■ Protection Functions (OVP/ CS/ FBN/ VDD pins)
Parameter
Symbol
min
typ
max
Unit
TTSD
130
150
170
°C
TSD Hysteresis Temperature
TTSDHY
40
55
70
°C
OVP Reference Voltage 1
OVP1 Release voltage (Note 10)
OVP1 Hysteresis of the release and
detection (Note 10)
OVP Reference Voltage 2
OVP1/OVP2
Differential voltage detection
FBN Over Voltage Protection 1(Note 10)
FBN Over Voltage Protection
Release(Note 10)
FBN Hysteresis Width(Note 10)
FBN Over Voltage Protection 2(Note 10)
FBN Clamp Voltage(Note 10)
CS Pin Over Current Protection
SEN Pin Over Current Protection
Voltage Protection of UVLO Detection
Voltage Protection Release of UVLO
Detection
UVLO Hysteresis Width
VOVP1
VOVP1L
-
2.65
3.05
2.95
-
3.25
V
V
VOVP1HYS
0.01
-
-
V
VOVP2
VOVP12HY
-
3.3
-
V
0.15
-
-
V
VFBOVPH1
4.19
4.65
5.12
V
FBP=2.3V
VFBOVPL1
4.10
4.55
5.01
V
FBP=2.3V
VFBHYS
VFBOVPH2
VFBClamp
VOCPC
VOCPS
VUVLOH
0.1
5.7
7.5
1.35
0.45
11.0
-
6.35
11.6
1.5
0.5
12.2
-
7.0
15.6
1.65
0.55
13.4
V
V
V
V
V
V
VUVLOL
7.6
8.5
9.4
V
VUVHYS
3.3
3.7
4.1
V
Over Heat Protection
Condition
Rise in Temperature (Tj)
Fall in Temperature after
TSD (Tj)
S
FBP=4.0V
Note 10. See “■ Protection Functions” and “■ Protection List”.
Rev.0.6
2014/07
-8-
[AP1653AEM]
10. Functional Descriptions
The AP1653 consists of a buck-boost PFC converter, an LED current control circuit / driver, a power-up
circuit, a soft-start circuit, an internal regulator (5V) and protection circuits. The buck-boost PFC converter
monitors LED cathode current and coil current, and it keeps LED anode voltage in adequate level by
switching two external N-ch MOSFETs. The LED current control circuit uses one external N-ch MOSFET,
and LED current is adjusted by an external resistor connected between the source of this MOSFET and the
ground. Additionally, up to 3% dimming in current ratio is possible according to the DC input signal to the
DIM pin.
■ Buck-boost PFC Converter
The buck-boost converter of the AP1653 switches ON/OFF two N-ch MODFETs (Q1, Q2) simultaneously
and controls operation to keep critical conduction. When two power MOSFETs are powered on at the same
time, the current flows Q1 → L2 → Q2 and current energy is charged to the coil. The switch ON period is
determined by a reference voltage (FBP pin), an error amplifier output (COMP pin) generated from LED
cathode voltage (FBP pin) and RAMP wave form that is internal generated.
Two power MOSFETs are turned OFF at once when the switch ON period is finished, and the charged
energy of the coil is released to C19 via D5 → L2 → D6. In this case, the AP1653 monitors this coil current
by a resistor (R6) between anode side of a commutation diode and the ground, and starts next switch ON
period when detecting that the coli current flow stops. By repeating this action, the buck-boost converter
keeps LED anode voltage in an adequate level.
■ LED Current Control Circuit / Driver
The LED current control circuit of the AP1653 controls LED current to monitor the voltage of the SEN pin
which is converted LED current to voltage by resistors RSEN (R30, R45) between external power MOSFET
(Q3) and the GND. The maximum value of LED current can be set. The calculation formula for the
maximum value of LED current is shown below.
ILEDmax [mA] = 250 [mV] / RSEN [Ω]
(DIM = 5 [V])…(1)
Up to 3% dimming in current ratio is available by the DC input signal to the DIM pin. It is able to control
LED current even if the voltage of the SEN pin is dropped to 7mV (at minimum) by controlling the internal
reference voltage that is determined by the DIM pin voltage and the SEN pin voltage with a chopper
comparator. Setting the DIM pin as GND voltage, LEDs are turned OFF and the maximum current is
conducted by an input voltage over 4V.
Figure 2. Dimming Characteristics with the DIM pin
Rev.0.6
2014/07
-9-
[AP1653AEM]
■ Power-up Circuit
The AP1653 has the HV pin that is able to input a high voltage commutated from AC100V or AC200V
directly and an auto power-up circuit that internally charges a capacitor connected to VDD. When a
full-wave rectified voltage is input to the HV pin, the capacitor (C7) that is connected to VDD is charged via
the internal power-up circuit. This charge current is 1mA if the voltage at the VDD pin is less than 1V. If the
VDD voltage is more than 1V, the capacitor is charged by 10mA. If the VDD voltage increases and gets over
12.2V (typ), UVLO is released and the switching operation of the buck-boost converter is enabled. In this
case, the switching operation is started by setting the ENA pin = “H”. Furthermore, if the VDD voltage
reaches 15V, the internal power-up circuit is turned OFF and the power supply from the HV pin is stopped.
At this time, power loss of the application can be suppressed by supplying the power from the secondary side
of the coil for a buck-boost conversion (L2) as it is a transformer.
BCK
Q1
External VDD
Power Supply Circuit
C3
R4
D1
R18
D6
Da
D5
R46
Q2
Ca
BST
R11
R39
R12
R6
R8
CS
VAC
~
L2
Q4
R19
C25
D10
R40
Buck-boost Converter
12
HV
1mA
4
VDD
9mA
C7
VDD
15V
Power-up
Circuit
Figure 3. Peripheral Circuit Example 1 of Power-up Circuit
Rev.0.6
2014/07
- 10 -
[AP1653AEM]
HV
15V
13.5V
12.2 V
8.5V
VDD
1V
10mA
IHV
1mA
BCK
BST
Normal load
Light load
Normal load
Figure 4. Power-up Characteristics
Note that, when supplying the VDD voltage from an external power supply, the HV pin must be connected
to the GRN.
1mA
12
HV
4
9mA
VDD
VDD
15V
separate power supply
C7
Power-up
Circuit
Figure 5. Peripheral Circuit Example 2 of Power-up Circuit
Rev.0.6
2014/07
- 11 -
[AP1653AEM]
■ Soft-start Circuit
The AP1653 is has a soft-start function. The soft-start circuit starts charging to a capacitor connected to the
SS pin by 2μA when VDD voltage exceeds 10V and the ENA pin is set to “H”. LED current is limited by a
lower voltage of the control voltage between the SS pin and the DIM pin. A recommended value of the
capacitor connected to the SS pin is 1μF. Soft-start characteristics vary depending on this capacitance.
■ Internal Regulator Circuit (5V)
The AP1653 integrates a regulator that generates 5V power supply from the VDD pin voltage for internal
circuits. The AP1653 is capable of a 3mA (max.) current supply externally from the VREF pin.
Connect a 10µF capacitor between the VREF pin and GND pin for stabilization. The internal RESER signal
(RSTL) is released if the VREF voltage exceeds 4V.
■ Power-up Sequence
The AP1653 starts buck-boost conversion and constant current operation when the VDD pin voltage exceeds
UVLO release voltage, the internal RSTL signal is released by the VREF circuit and the ENA pin is set to
“H”. The VREF circuit is independent from the ENA signal, the VREF voltage rises when the VDD voltage
is rises up.
12.2V
8.5V
VDD and ENA are
Sequence Free
VDD
ENA
4V
VREF
4V
VREF is independent from ENA
RSTL
Start Operation
Start Operation
BCK, BST
GD
Stop Operation
Stop Operation
Stop
Active
Stop
Active
Stop
Figure 6. Timing Chart of Power Supply Circuit Block
Rev.0.6
2014/07
- 12 -
[AP1653AEM]
■ Protection Functions
1) Thermal Shut Down (TSD)
The AP1653 has a temperature sensor. If the temperature of the IC exceeds 150°C the thermal shut down
is activated and the AP1653 stops buck-boost conversion and constant current operation. The AP1653
resumes these operations when the temperature is decreased under 95°C.
2) Over Voltage Protection (OVP1, OVP2)
When the OVP pin voltage exceeds 3.05V, the protection function is activated and the AP1653 stops
buck-boost conversion and constant current operation. In this case, the AP1653 resumes these operations
if the OVP pin voltage is decreased under 2.95V (OVP1). However, when the OVP pin voltage is exceeds
3.3V, the AP1653 is stopped by a latch stop (OVP2) and the BST pin output is stopped at “H” level. This
is to protect the LED or the electrolytic capacitor (C19) that is connected to anode side of LED from a
short of the high-side MOSFET. It blowouts the AC input fuse (F1) to stop operation. The AP1653 does
not resume the operation even if the OVP pin voltage becomes below 2.9V when the operation is stopped
by a latch stop. The ENA pin should be set to “L” at least 10ms to once or the VDD should be supplied
again to resume the operation.
3) Over Current Protection for the CS pin (OCPCS)
It detects an over current at low-side MOSFET. Connect a resistor between the MOSFET and the ground
and input I-V converted voltage to the CS pin. The over current protection is activated when the CS pin
voltage exceeds 1.2V, and the AP1653 stops buck-boost conversion and constant current operation.
However, there is a BLANK period that masks the detection result. The over current protection is not
enabled for 350ns after the MOSFETs are turned on. The CS pin is pulled up by 2μA. The protection will
be activated if this pin becomes open state. It is a latch stop protection. The ENA pin should be set to “L”
once or the VDD should be supplied again to resume the operation.
4) Over Current Protection for the SEN pin (OCPSEN)
It detects an over current at LEDs. The over current protection is activated when the SEN pin voltage
exceeds 0.5V, and the AP1653 stops buck-boost operation and constant current operation. The SEN pin is
pulled up by 2μA. The protection will be activated if this pin becomes open state. It is a latch stop
protection. The ENA pin should be set to “L” at least 10ms to once or the VDD should be supplied again
to resume the operation.
5) Over Voltage Protection for the FBN pin (FBOVP)
The over voltage protection is activated when the FBN pin voltage exceeds 4.65V (when FBP=2.3V), and
the AP1653 stops buck-boost operation but it does not stop constant current operation. The AP1653
resumes buck-boost operation when the FBN voltage is decreased under 4.55V. Normally, the AP1653
maintains a stable output by an intermittent operation of the buck-boost conversion for a light load period
with this function. The detection voltage will vary automatically according to the FBP pin voltage.
6) Clamp Protection Circuit for the FBN pin (FBClamp)
This protection function is activated when the FBN pin voltage exceeds 8.0V because of a reason such as
LED short. In this case, the FBN pin is clamped to 8.0V to protect internal circuit of the IC.
7) UVLO
When the VDD pin voltage exceeds 12.2V, the AP1653 starts buck-boost conversion. If the VDD pin
voltage becomes lower than 8.5V, the AP1653 stops buck-boost conversion.
8) FLG pin
The FLG pin is an internal status output pin that indicates a protection function is activated. It is an open
drain output pin, and outputs “L” when a protection function is activated. Pull up this output signal to the
VDD level of the peripheral circuits.
Rev.0.6
2014/07
- 13 -
[AP1653AEM]
■ Protection List
Protection Function
TSD
OVP1
Automatic
Automatic
OVP2
Latch
OCPCS
OCPSEN
FBOVP
Automatic
Latch
Automatic
Detection
Release
150℃ or more
3.05V or more
95℃ or less
2.95V or less
3.3V or more
ENA is L
level,or,VDD is
turned on again
1.5V or more
0.5V or more
4.65V or more
1.5V or less
ENA is L
level,or,VDD is
turned on again
4.55V or less
FBClamp
Automatic
11.6V or more
11.6V or less
UVLO
Automatic
8.5V or less
12.2V or more
Rev.0.6
BCK
(“H”)
OFF
BST
(“L”)
OFF
GD
Detection pin.
OFF
-
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OVP pin
LED Open
OVP pin
High-side
MOSFET Short
CS pin
SEN pin
OFF
OFF
Valid
OFF
OFF
OFF
OFF
OFF
OFF
FBN pin
Detection voltage
when VFBP =
2.3V
FBN pin
LED Short
VDD pin
2014/07
- 14 -
[AP1653AEM]
11. Recommended External Circuits
Q1
L2
D6
+OUT
R36
Da
C3
D5
D1
Q2
Ca
R11
C19
R37
R12
R6
R38
R8
-OUT
U1
CS
AP1653
OVP
R34
C17
C25
BST
C2
SS
C15
R4
R35
R46
L1
VSS
COMP
VDD
FBN
R33
C16
C7
R39
R1
VREF
C18
R32
Dc
R2
NC
Q4
R31
GD
Q3
C13
C1
D3
D10
R40
NC
SEN
BOOT
DIM
Z1
R27
DC
DIM
R25
F1
C8
Ra
R30
VREF
(RSEN)
C12
Db
LX
VSS
BCK
FBP
NC
FLG
R22
C11
AC1
AC2
C10
VREF
VREF
R18
NC
VREF
HV
ENA
R23
R21
C9
R19
Figure 7. AP1653 External connection circuit example
Rev.0.6
2014/07
- 15 -
[AP1653AEM]
12. How to Set Peripheral Circuit Constant
Calculation method of the circuit constant for Figure 7 is shown below.
 Setting of the LED Current
LED current is determined by the resistance R30 (RSEN) connected to the SEN pin and the SEN pin voltage.
When DIM = 5V, the SEN pin voltage is controlled to 250mV by an internal circuit of the IC. The maximum
LED current (ILEDmax) is calculated by the following formula.
ILEDmax=0.25 / R30
• • • (2)
Example: If ILED = 350mA, the resistance R30 should be 0.714Ω.
 How to set the inductance of the coil L2
Inductance is determined by input and output conditions.
Input voltage: AC85 ~ 265V
Load condition: LEDVf=120V, ILED=350mA, △LEDVf = ±30%
Maximum load voltage LEDVfmax=156V
The maximum coil current and ON-Duty of the PFC driver must be determined before calculating the
inductance. ON-Duty value is calculated by the equation (3).
ON-Duty= (VOUT / VIN ) / (1+ (VOUT / VIN))
• • • (3)
VIN and VOUT are calculated from the following conditions.
VIN= (VINmin‐VD1) ×
• • • (3-1)
VOUT=LEDVfmax+VD5+VD6 • • • (3-2)
Example: ON-Duty (3) will be 68.2% if the minimum input voltage VIN min. = 85V ac, maximum load
voltage LEDVfmax. = 156V, VD1 = 2V (Vf of D1) and VD5 = VD6 = 1V (Vf of D5 and D6).
Calculate the maximum coil current value (ILmax) by the set current value (ILED) and ON-Duty which are
calculated by equations (3) . It is assumed that ILED has the maximum value including variations for the
maximum coil current calculation.
ILmax= (π/2) ×2 (ILED/ (1-ON-Duty)) • • • (4)
Example: The maximum current of ILED will be 360.5mA since the variation is ±3% when the LED current is
350mA. At this time, the maximum coil current ILmax is 3.56A by equation (4).
The maximum inductance (Lmax) is calculated from the maximum on-time of the PFC driver which is
determined internally and the maximum coil current IL from equation (4).
Lmax= (VIN × TON) / ILmax • • • (5)
VIN to determine the maximum value (Lmax) is calculated from the following equation.
VIN= (VINmax‐VD1) • • • (5-1)
Example: When VD1=2V and TON=25µs (min.), the maximum value Lmax by (5) is calculated to be
0.829mH. Assuming that the coil variation is ±20%, the Lmax value will be 0.691mH.
20kHz or more is recommended for the switching frequency (FPFC) of the PFC driver. Therefore inductance
should be determined as FPFC in equation (6) will be more than 20kHz.
FPFC = 1 /(((ILmax × Lmax) / VIN) + ((ILmax × Lmax) / VOUT)) • • • (6)
Rev.0.6
2014/07
- 16 -
[AP1653AEM]
VIN and VOUT to determine the switching frequency FPFC are calculated from the following equations.
VIN = (VINmax - VD1) • • • (6-1)
VOUT = LEDVfmax + VD5 + VD6 • • • (6-2)
Example: Switching frequency FPFC will be 23.4kHz when inductance is set to 0.68mH. In this case, the
variation of Inductance is ±20%, VD5=VD6=1V and VD1 = 2V.
The VDD voltage must be supplied from the secondary circuit of the L2 coil. Select external devices to keep
the voltage in the recommended range of the VDD. The VDD voltage must not drop below 15.5V.
Especially, take extra care when the load is light and the input voltage is at the minimum level. Transforming
setting must correspond to the safety standards of each country. Please design a transformer in consideration
of safety standard of each country.
 Setting of the Output Capacitor C19
The FBP pin must be set before setting the output capacitor. The FBP voltage is controlled by an internal
circuit of the device and the FBN voltage becomes equal to the drain voltage of the FET(Q3) for constant
current driver. The minimum value of the FBN voltage can be calculated by the following equation.
FBNmin= Ronmax×ILED+VSEN • • • (7)
Ronmax is FET(Q3) of Maximum value of on-resistance.
Example: FBNmin will be 0.618V when Ronmax=1Ω, ILED=360.5mA and VSEN=0.2575V.
From equation (7), the minimum value Coutmin of the output capacitor C19 is calculated by the output
ripple difference △ RIP.
Coutmin=△RIP/(VFBP-0.1-FBNmin) • • • (8)
△RIP is a variable which changes with the LED current, please refer to the following graph.
The output ripple difference △ RIP
( m A・s)
0.5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0
50
100
150
200
250
300
350
400
Example: Coutmin will be 299.6µF when △RIP =0.474mA・s, VFBP=2.3V and FBNmin=0.618V. The value
of output capacitor C19 should be 20% higher or more than the values shown here.
Rev.0.6
2014/07
- 17 -
[AP1653AEM]
 Setting of the CS terminal
Calculate the maximum current (IZCSmax) that flows R6 and R8 resistors for buck PFC converter.
IZCSmax = LEDVf × (1-△LEDVf) / Lmax × ZCSDLYMIN
• • • (9)
ZCSDLYMIN: Minimum delay value of zero detection; It will be 1.8us.
From equation (9), the minimum value of R6 and R8 resistors (Rmin) is calculated by equation (10).
• • • (10)
Rmin = (0.02-(1.2u-(0.02/R11))・R12) / (IZCS max)
From equation (10), please set the resistor value as it will be approximately 10% greater than this figure.
Example: The maximum current of ZCS will be 185mA when LEDVf=120V, △LEDVf=30% and
Inductance Lmax =0.68mH. From this result, Rmin value will be 0.43Ω by assuming R11 = R12
= 100kΩ. Therefore the setting value should be 0.47Ω by the result of Rmin value.
 OVP Setting for Overvoltage Protection
Calculate the maximum value of the output voltage (Voutmax).
Voutmax = LEDVf × (1+△LEDVf) + VFBP • • • (11)
VFBP: It is the terminal voltage of FBP that is determined by R22 and R23 resistor values.
From Equation (11), OVP setting voltage VOV is used to calculate the R36, R37 and R38 resistances by
following equation (12) so that the VOV value is 10% greater or more than the Voutmax value.
VOV= VOVP1 / (R38× (R36 + R37 + R38))
• • • (12)
VOVP1: Operating voltage of OVP1; It will be 3.05V (typ).
Example: The maximum output voltage (Voutmax) will be 158.4V when VFBP = 2.4V, LEDVf=120V and
△LEDVf=30%. In this case, if R38 = 3kΩ, and R36 = R37 = 100kΩ, OVP setting voltage will be
206.4V. This VOV value meets the condition that the setting value must be greater than 10% of the
maximum output voltage (Voutmax).
Rev.0.6
2014/07
- 18 -
[AP1653AEM]
13. Package
■ Outline Dimensions
・24pin TSSOP (Unit: mm)
■ Marking
AP1653
(2)
YYWWAAA
(3)
(1)
(4)
(5)
(1) 1pin Description
(2)Product Name "AP1653"
(3)Year Code(last 2 digits)
(4)Week Code
(5)Management Code
Rev.0.6
2014/07
- 19 -
[AP1653AEM]
IMPORTANT NOTICE
0. Asahi Kasei Microdevices Corporation (“AKM”) reserves the right to make changes to the
information contained in this document without notice. When you consider any use or application
of AKM product stipulated in this document (“Product”), please make inquiries the sales office of
AKM or authorized distributors as to current status of the Products.
1. All information included in this document are provided only to illustrate the operation and
application examples of AKM Products. AKM neither makes warranties or representations with
respect to the accuracy or completeness of the information contained in this document nor grants
any license to any intellectual property rights or any other rights of AKM or any third party with
respect to the information in this document. You are fully responsible for use of such information
contained in this document in your product design or applications. AKM ASSUMES NO
LIABILITY FOR ANY LOSSES INCURRED BY YOU OR THIRD PARTIES ARISING FROM
THE USE OF SUCH INFORMATION IN YOUR PRODUCT DESIGN OR APPLICATIONS.
2. The Product is neither intended nor warranted for use in equipment or systems that require
extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which
may cause loss of human life, bodily injury, serious property damage or serious public impact,
including but not limited to, equipment used in nuclear facilities, equipment used in the aerospace
industry, medical equipment, equipment used for automobiles, trains, ships and other
transportation, traffic signaling equipment, equipment used to control combustions or explosions,
safety devices, elevators and escalators, devices related to electric power, and equipment used in
finance-related fields. Do not use Product for the above use unless specifically agreed by AKM in
writing.
3. Though AKM works continually to improve the Product’s quality and reliability, you are
responsible for complying with safety standards and for providing adequate designs and safeguards
for your hardware, software and systems which minimize risk and avoid situations in which a
malfunction or failure of the Product could cause loss of human life, bodily injury or damage to
property, including data loss or corruption.
4. Do not use or otherwise make available the Product or related technology or any information
contained in this document for any military purposes, including without limitation, for the design,
development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or
missile technology products (mass destruction weapons). When exporting the Products or related
technology or any information contained in this document, you should comply with the applicable
export control laws and regulations and follow the procedures required by such laws and
regulations. The Products and related technology may not be used for or incorporated into any
products or systems whose manufacture, use, or sale is prohibited under any applicable domestic or
foreign laws or regulations.
5. Please contact AKM sales representative for details as to environmental matters such as the RoHS
compatibility of the Product. Please use the Product in compliance with all applicable laws and
regulations that regulate the inclusion or use of controlled substances, including without limitation,
the EU RoHS Directive. AKM assumes no liability for damages or losses occurring as a result of
noncompliance with applicable laws and regulations.
6. Resale of the Product with provisions different from the statement and/or technical features set
forth in this document shall immediately void any warranty granted by AKM for the Product and
shall not create or extend in any manner whatsoever, any liability of AKM.
7. This document may not be reproduced or duplicated, in any form, in whole or in part, without prior
written consent of AKM.
Rev.0.6
2014/07
- 20 -
Similar pages