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PDF AP1695-20C Data sheet ( Hoja de datos )
| Número de pieza | AP1695-20C | |
| Descripción | HIGH EFFICIENCY DIMMABLE LED DRIVER IC | |
| Fabricantes | Diodes | |
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AP1695-20C
OFFLINE, HIGH PF, HIGH EFFICIENCY DIMMABLE LED DRIVER IC
Description
The AP1695-20C is a high performance AC/DC power factor corrector
for mains dimmable LED driver applications. The device uses Pulse
Frequency Modulation (PFM) technology to regulate output current
while achieving high power factor and low THD. It operates as a BCM
(Boundary Conduction Mode) which is good for EMI.
The AP1695-20C internally integrates a high voltage MOSFET which
can realize a lower BOM cost. The AP1695-20C 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 AP1695-20C features low start-up current, low operation current.
It adopts valley on switching mode to achieve high efficiency. It also
has rich protection features including over voltage, short circuit, over
temperature protection.
The AP1695-20C provides the dimmable LED driver with a wide
dimmer compatibility including leading edge and trailing edge dimmer.
The AP1695-20C can achieve deep dimming down to 1%, while the
dimming curve is compliant with the standard of NEMA SSL6.
The AP1695-20C is available in SO-7 package.
Pin Assignments
(Top View)
S1
CS 2
RI 3
GND 4
SO-7
Applications
Mains Dimmable LED Lighting
7 Drain
6 VCC
5 FB
Features
Boundary Conduction Mode (BCM) Operation to Achieve High-
efficiency
High PF and Low THD (PF>0.9, THD<30%)
High Efficiency without Dimmer
Wide Range of Dimmer Compatibility
Dimming Curve Compliant with NEMA SSL6
Low Start-up Current
Tight LED Current
Tight LED Open Voltage
Valley-mode Switching to Minimize the Transition Loss
Easy EMI
Internal Protections:
Under Voltage Lock Out (UVLO)
Leading-edge Blanking (LEB)
Output Short Protection
Output Open Protection
Over Temperature Protection
Flexible for Design with Small Form Factor and Very Low BOM
Cost
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
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.
AP1695-20C
Document number: DS37538 Rev. 1 - 2
1 of 15
www.diodes.com
March 2015
© Diodes Incorporated
1 page  
AP1695-20C
Recommended Operating Conditions
Symbol
VCC
TA
Parameter
Power Supply Voltage
Ambient Temperature
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
UVLO Section
VTH (ST)
VOPR (Min)
VCC_OVP
–
Standby Current Section
Start-up Threshold
Minimum Operating Voltage
VCC OVP Voltage
VCC Delatch Voltage (Note 5)
–
After turn on
–
–
IST
ICC (OPR)
Current Sense Section
VCS_REF
VCS_CLAMP
tONP_MIN
tD(H-L)
Feedback Input Section
Start-up Current
Operating Current
Current Sense Reference
Current Sense Reference Clamp
Minimum tONP
Delay to Output (Note 5)
VCC = VTH (ST) -0.5V,
Before start up
Static
–
–
–
–
IFB
VFB_CV
VFB_OVP
Internal Mosfet Section
Feedback Pin Input Leakage
Current
FB CV Threshold
FB OVP Threshold
VFB = 2V
–
–
RDS(ON)
VBR(Drain)
IDSS
Output Current
Drain-Source On-State Resistance
Drain-Source Breakdown Voltage
Drain-Source Leakage Current
VGS = 10V, ID = 1.25A
VGS = 0V, ID = 250µA
VDS = 600V, VGS = 0V
–
System Output Current On Final
Test Board
–
Over Temperature Protection Section
–
Shutdown Temperature (Note 5)
–
–
Temperature Hysteresis (Note 5)
–
Note 5: These parameters, although guaranteed by design, are not 100% tested in production.
Min Max
7 25
-40 +105
Min Typ Max
13 14.5 16
5.5 6.5 7.5
27 29 31
345
– – 20
– 900 1300
–1–
1.2 1.4
–
700 – 1000
50 150 250
––4
3.8 4 4.2
4.5 6 7.5
– – 5.5
600 –
–
––1
––
+150
–
–
+20
±2
–
–
Unit
V
°C
Unit
V
V
V
V
µA
µA
V
V
ns
ns
µA
V
V
Ω
V
µA
%
°C
°C
AP1695-20C
Document number: DS37538 Rev. 1 - 2
5 of 15
www.diodes.com
March 2015
© Diodes Incorporated
5 Page 
Application Information Based on Buck Structure (Cont.)
Fault Protection
Over Voltage Protection and Output Open Protection
VCC
RFB1
RFB2
FB
AP1695-20C
AP1695-20C
Figure 4. OVP Circuit
The output voltage is sensed by the auxiliary winding voltage of the Buck transformer, the VCC pin and FB pin provide over voltage protection
function. When the output is open or large transient happens, the output voltage will exceed the rated value. When the voltage of Vcc cap exceeds
VCC_OVP or VFB_CV, the over voltage is triggered and the IC will discharge VCC. When the VCC is below the UVLO threshold voltage, IC will start a
new work cycle and the Vcc cap is charged again by start resistance. If the over voltage condition still exists, the system will work in hiccup mode.
Attention: If the external fast startup circuit is adding in the application and the over voltage protection and output open protection happen, the IC
will trigger latch.
Output Short Protection
When the output is shorted, the output voltage will be clamped at 0. At this condition, VCC will drop down without auxiliary winding for power supply.
And the VCC will drop to UVLO threshold voltage, the IC will shut down and restart a new operating cycle, and the VCC is charged by startup
resistance. When VCC is higher than Vcc_start voltage, IC will output a bunch of pulse to control power switch on and off. When still no FB signal
detected the device will not output more pulse. So the VCC will drop to VCC UVLO threshold again. If output short condition still exists, the system
will operate in hiccup mode.
Attention: If the external fast startup circuit is adding in the application, the device will not work at UVLO mode, and the device will work at
minimum toff mode.
Over Temperature Protection
AP1695-20C has two kinds of over temperature protection processes. First, the system is operating normally, the ambient temperature is changed
to +170°C suddenly, the IC will trigger over temperature protection which leads to a latch work mode. Second, if the system starts when the
ambient temperature is higher than +150°C, over temperature protection will be triggered. So the AP1695-20C can startup successfully when the
ambient temperature is less than +150°C.
Recommended Applications
The AP1695-20C is a device which internally integrates a MOSFET, the output current is limited by the internal integrated MOSFET, using this
device can cover up to 10W’s application meanwhile the output current is less than 200mA in buck structure.
Components Selection Guide
If the system’s spec is changed, please refer to the design sheet of the AP1695-20C and select the compatible system parameter. When the
system needs to be adjusted slightly, please refer to the table below and adjust the value of the related component.
Item
IO
Output Current Ripple
ton_initial
Output Open Voltage
Dimming Performance
EMI
Line Compensation
Description
Output current
Small current ripple is good for LED life
System initial on time, used to startup the system
Setting the output voltage when the LED is open
Improve the dimming performance
Pass EN 55022 class B with 6DB margin
To get a good line regulation
Related Components
R8
C4
R1
R5, R6
R1, RF, R9, C2, C4
L1, C1
R7
AP1695-20C
Document number: DS37538 Rev. 1 - 2
11 of 15
www.diodes.com
March 2015
© Diodes Incorporated
11 Page | ||
| Páginas | Total 15 Páginas | |
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