AP8275M7VR-Y [AITSEMI]
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV START-UP CIRCUIT;
| 型号： | AP8275M7VR-Y |
| 厂家： | 
AiT Semiconductor |
| 描述： | QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV START-UP CIRCUIT |
| 文件： | 总15页 (文件大小：592K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
DESCRIPTION
FEATURES
Internal HV Start-up Circuit
The AP8275 consists of an integrated current mode
Pulse Width Modulator (PWM) controller and high
voltage start circuit, specifically designed for a high
performance off-line converter with minimal external
components. QR-PWM, QR-PFM, Burst-mode
operation and low consumption device help to meet
the standby energy saving standards and achieve
higher efficiency. Excellent EMI performance is
achieved by frequency modulation and soft driver
technique. The AP8275 offers completed and
excellent protections including Brown-in/out, AC Line
OVP, X-cap discharge, output over voltage
protection, external over temperature protection,
Cycle-by-Cycle current limiting, over load protection.
Multi-mode operation to achieve higher
efficiency
Adaptive PWM switching frequency 65/85kHz
AC Brown-in/out protection(AP8275-B)
AC Line over voltage protection(AP8275-A)
X-cap discharge function
(Pass IEC62368-1:2014 certificationꢀ
No-load consumption power < 50mW @230VAC
Proprietary Frequency Jitter for EMI
VDD Operating voltage range 8~40V
Adjustable AC Line Input Compensation
Excellent Protection Coverage
Over Temperature ProtectionꢁOTPꢀ
Output over voltage protection
Cycle-by-cycle Over Current ProtectionꢁOCPꢀ
Output Open/short Protection
The AP8275 is available in SOP7 package
Patented DMG resistor short protectionꢁLatchꢀ
Secondary Rectifier Short Protection
Over Load ProtectionꢁOLPꢀ
ORDERING INFORMATION
Available in SOP7 Package
Package Type
Part Number
APPLICATION
AP8275M7R-Y
AP8275M7VR-Y
SOP7
SPQ: 4,000pcs/Reel
M7
Stand-by power
Open-frame SMPS
Adaptor
Y: Function Type
A: AC Line OVP
Note
B: Brown-in/out
TYPICAL APPLICATION
V: Halogen free Package
R: Tape & Reel
AiT provides all RoHS products
REV1.0
- FEB 2019 RELEASED -
- 1 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
PIN DESCRIPTION
Top View
Pin #
1
Symbol
DMG
Function
Demagnetization pin. Input and output voltage detection by the voltage divider
resistors.
Voltage feedback. By connecting an opto-coupler to close the control loop and
achieve the regulation.
2
FB
3
4
5
6
CS
GND
GATE
VDD
Current Sense Input
Ground
Totem-pole gate drive output for the power MOSFET.
Positive Supply voltage Input
High voltage start pin.
7
HV
High voltage startup, X-cap discharge and AC Brown-in/out protection/ AC Line
over voltage protection are realized by connecting diodes to AC input.
REV1.0
- FEB 2019 RELEASED -
- 2 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Supply voltage Pin VDD
FB, CS, DMG Pin
-0.3V ~ 43V
-0.3V ~ 7V
-0.3V ~ 15V
-0.3V ~ 800V
-40℃~ 150℃
-55℃~ 150℃
260℃
GATE Pin
HV Pin
Operating Junction Temperature℃
Storage Temperature Range
Lead Temperature (Soldering, 10Secs)
Package Thermal Resistance
HBM ESD ProtectionNOTE1
MM ESD ProtectionNOTE2
SOP7
80℃/W
±4.0kV
300V
Stress beyond above listed ꢂAbsolute Maximum Ratingsꢃ may lead permanent damage to the device. These are stress ratings only and
operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
NOTE1: Test standard: JEDEC JS-001-2014。
NOTE2: Test standard: JESD22-A115C-2010
TYPICAL POWER
Part Number
AP8275
Input Voltage
90-265 VAC
AdapterNOTE3
120W
NOTE3: Typical output power is tested in an adapter at 40°C ambient temperature, with enough cooling conditions.
REV1.0
- FEB 2019 RELEASED -
- 3 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
ELECTRICAL CHARACTERISTICS
TA=25°C, VDD=15V, unless otherwise specified
Parameter
Symbol
Conditions
Min. Typ. Max.
Unit
HV section
Break-Down Voltage
Start Up Charging Current
Off-State Current
BVHV
I_HV
IHV=250μA
800
830
1.5
18
-
2
V
mA
μA
V
VDD=VDDoff-1, HV=500V
HV =500V
1
5
-
IOFF
30
-
X-Cap Discharge Voltage
Power Down Detection
Enabling Duration
V_UNPLUG
35
td_UNPLUG
-
60
-
ms
HV section- AC Line OVP AP8275-A
HV OVP Voltage
V_OVP
DC Level
439
-
460
27
481
-
V
V
HV OVP Hysteresis Voltage
HV section- Brown/in out AP8275-B
Brown In Voltage
V_OVP_hys
V_BNI
td_BNI
V_BNO
td_BNO
108
115
150
102
60
122
V
μs
V
Brown In Enabling Duration
Brown Out Voltage
-
90
-
-
109
-
Brown Out Enabling Duration
VDD Supply Voltage Section
VDD Start Up Threshold
VDD Under Voltage
ms
VDDon
VDDoff
18.3 19.3 20.3
V
V
7
38
-
8
9
43
-
Shutdown Threshold
VDD OVP Voltage
VDDovp
td_OVP
40.5
80
V
De-Bounce time of VDD OVP
Voltage
μs
VDD Threshold for Continuous
Work Under BM
Vhold-up
VRestart
-
-
10
4
-
-
V
V
VDD Restart Voltage
VDD Supply Current Section
Operating Supply Current,
Switching
IVDD0
VFB=3.5V,CS=0.3V
VFB=0.5V,CS=0.3V
1
1.5
3.0
1.5
mA
mA
Operating Supply Current,
Under Burst Mode
IVDD1
0.1
0.65
REV1.0
- FEB 2019 RELEASED -
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AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
Parameter
Symbol
IVDD_Fault
Conditions
After OVP
Min. Typ. Max.
Unit
mA
Operating Supply Current,
With Protection Tripping
OSCILLATOR Section
0.1
0.8
1.5
I
DMG>330μA
DMG<330μA
60
77
-
65
85
22
30
±6
70
92
-
kHz
kHz
kHz
Hz
Switching Frequency
fosc
I
Burst Mode Frequency
Jitter Frequency
fosc_BM
f_jitter
-
-
Frequency Modulation range
FB Section
Δfosc
-
-
%
FB Loop Voltage
FB Short Current
Maximum Duty Cycle
VFB
4.8
5.2
0.2
80
5.4
V
mA
%
V
IFB_SHORT
Dmax
-
70
-
-
90
-
IDMG>330μA
IDMG<330μA
2.5
1.8
1.15
Green Mode Entry Voltage
VFB_PFM
-
-
V
Burst Mode Entry Voltage
Burst Mode Ending Voltage
OLP Threshold Voltage
OLP De-Bounce Time
VFB_BM_L
VFB_BM_H
Vth_OLP
td_OLP
-
-
V
-
4.1
-
1.25
4.4
60
-
4.7
-
V
V
ms
CURRENT SENSE SECTION
Soft-Start Time
tSS
-
-
8
-
-
ms
ns
Leading Edge Blanking Time
Internal Current Limiting
Threshold Voltage
tLEB
400
Vth_OCP
VDSP
0.72 0.75 0.78
V
Threshold Voltage of
Secondary Rectifier Short
Protection
-
1.1
-
V
De-Bounce Time of SRCP
td_DSP
V_CSOTP
td_CSOTP
-
0.78
-
7
-
0.82
-
Cycles
V
CS OTP Threshold Voltage
CS OTP De-Bounce Time
DMG Section
0.8
48
ms
DMG OVP Voltage
De-Bounce Time of DMG
OVP
VDMG_OVP
td_DOVP
thold
2.7
3
7
5
3.3
V
-
-
-
-
Cycles
Maximum Hold Time
us
REV1.0
- FEB 2019 RELEASED -
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AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
Parameter
Symbol
Duty_Slope
ton_max
Conditions
fosc=65kHz
Min. Typ. Max.
Unit
%
Minimum Duty Cycle of Slope
-
-
35
12
-
-
Compensation
Minimum Turn ON Time
GATE Section
us
Output Low Level
VOL
VOH
-
6
-
-
-
1
-
V
V
V
Output High Level
Output Clamp Voltage Level
V_clamping
CS=0.3V,FB=3V
1.2V~10.8V
12
-
Output Rising Time
Output Falling Time
t_r
t_f
-
-
60
20
-
-
ns
ns
@CL=1000pF
10.8V~1.2V
@CL=1000pF
Thermal section
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
TSD
130
-
145
30
-
-
℃
℃
THYST
REV1.0
- FEB 2019 RELEASED -
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AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTICS
1.
3.
5.
BV_HV vs.TJ
V_BNO vs.TJ
VDDon vs.TJ
2.
4.
6.
V_BNI vs.TJ
VDDovp vs.TJ
VDDoff vs.TJ
REV1.0
- FEB 2019 RELEASED -
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AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
7.
fOSC vs. TJ
8.
Vth_OCP vs.TJ
9.
V_OVP vs. TJ
REV1.0
- FEB 2019 RELEASED -
- 8 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
BLOCK DIAGRAM
REV1.0
- FEB 2019 RELEASED -
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AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
DETAILED INFORMATION
Startup
At start up, the internal high-voltage current source supplies the internal bias and charges the external VDD
capacitor. When VDD reaches VDDon, the device starts switching and the internal high-voltage current source
stops charging the capacitor. After start up, the bias is supplied from the auxiliary transformer winding.
Soft-start up
In the process of start up, the current of drain increases to maximum limitation step by step. As a result, it can
reduce the stress of secondary diode greatly and prevent the transformer turning into the saturation state.
Typically, the duration of soft-start is 8ms.
Oscillator
The switching frequency of AP8275 is internally fixed. When the input voltage is high (IDMG>330uA), the
frequency is 65kHz. When the input voltage is low (IDMG<330uA), the frequency is 85kHz.The AP8275 can
ease the design of the transformer by increasing the switching frequency.
PFM mode
PFM operation helps to meet the standby energy saving standards and achieve higher efficiency. When FB is
less than VFB_PFM, the AP8275 enter PFM. Lighter the load, less the switching frequency. The minimum
switching frequency is closed at fosc_BM.
Quasi-Resonant switching
The AP8275 can calculate the frequency of the Lm and Clump oscillator. The valley detection is realized by
DMG pin to achieve accurate valley opening, and improve the conversion efficiency under DCM.
REV1.0
- FEB 2019 RELEASED -
- 10 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
Burst-mode operation
The AP8275 enters burst-mode operation in order to minimize the power dissipation in standby mode. As the
load decreases, the feedback voltage decreases. When the voltage on FB pin falls below VFB_BM_L (1.15V
typically), the device enters burst mode and power MOSFET stops switching. It can be switched on again
once the voltage on FB pin exceeds VFB_BM_H
.
Brown-in/out protection- AP8275-B
The AP8275-B features Brown-in/out function on HV pin. When HV < V_BNO, GATE pin will remain off even
when the VCC already reaches VDDon. It therefore forces the VDD hiccup between VDDon and VDDoff. Unless the
next VDDon is tripped and the line voltage rises over V_BNI, GATE pin will start switching. A hysteresis is
implemented to prevent the false-triggering.
.
AC Line OVP- AP8275-A
AP8275-A integrates input voltage detection module to realize AC Line OVP function. When the HV voltage is
higher than V_OVP, the GATE output will stop switching; when AC Line Voltage decreases, AP8275-A
detects that the HV voltage is less than V_OVP-V_OVP_hys, and the GATE output will start switching again.
REV1.0
- FEB 2019 RELEASED -
- 11 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
Gate driver
The internal power MOSFET in the AP8275 is driven by a dedicated gate driver for power switch control. A
good tradeoff is achieved through the built-in totem pole gate design with proper output strength and dead
time. The good EMI system design and low idle loss is easier to achieve with this dedicated control scheme.
Over Load Protection (OLP)
Overload is defined as the load current exceeding a pre-set level due to an accident event as a fault. If FB
exceeds Vth_OLP for more than td_OLP (de-bounce time of OLP), the protection circuit should be activated to
protect the SMPS.
X-cap discharge
The AP8275 features X-cap discharge function on HV pin. When the AC input is unplugged, the AP8275 will
discharge the X-cap until the voltage is under the safety range. This function has been certified by IEC
62368-1:2014
Internal Slope Compensation
Built-in slope compensation circuit adds voltage ramp onto the feedback voltage for PWM generation. This
greatly improves the close loop stability at CCM and prevents the sub-harmonic oscillation and thus reduces
the output ripple voltage.
Line Input Compensation
The AP8275 offers Line Input Compensation; this feature improves the power limit constant output. The
AP8275 detects the input voltage across DMG pin and generate the compensated current. Thus the
compensated current can be calculated as ILC=K*IDMG, where K is the compensated coefficient. ILC multiplied
R3 equals the compensated voltage that can limit the pulse-by-pulse current.
REV1.0
- FEB 2019 RELEASED -
- 12 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
Over Temperature Protection
Both an internal OTP circuit and an external OTP circuit are embedded inside the AP8275 to prevent the
system from hot damage. If the temperature exceeds about 145℃，OTP fault is activated. Simultaneously, an
NTC resistor is implemented to sense whether there is any hot-spot of power circuit. If the voltage exceeds
the external OTP trip level VCS>V_CSOTP (typical 0.8V), an internal counter has been added to prevent
incorrect OTP detection. However, if td_CSOTP of subsequent OTP events are detected, the external OTP
protection is tripped.
Typical Application
Component Parameter and Layout Considerations:
1. VDD capacitor EC1 should be placed at the nearest place from the VDD pin and the GND pin.
REV1.0
- FEB 2019 RELEASED -
- 13 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
PACKAGE INFORMATION
Dimension in SOP7 (Unit: mm)
Symbol
Min
Max
1.75
0.225
1.50
0.70
0.48
0.43
0.26
0.21
5.10
6.20
4.10
A
A1
A2
A3
b
-
0.10
1.30
0.60
0.39
0.38
0.21
0.19
4.70
5.80
3.70
b1
c
c1
D
E
E1
e
1.27 BSC
1.05 BSC
h
0.25
0.50
0.50
0.80
L
L1
θ
0°
8°
REV1.0
- FEB 2019 RELEASED -
- 14 -
AiT Semiconductor Inc.
AP8275
www.ait-ic.com
QUASI-RESONANT AC-DC CONVERTER WITH INTERNAL HV
START-UP CIRCUIT
IMPORTANT NOTICE
AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to
discontinue any integrated circuit product or service without notice, and advises its customers to obtain the
latest version of relevant information to verify, before placing orders, that the information being relied on is
current.
AiT Semiconductor Inc.'s integrated circuit products are not designed, intended, authorized, or warranted to
be suitable for use in life support applications, devices or systems or other critical applications. Use of AiT
products in such applications is understood to be fully at the risk of the customer.
As used herein may
involve potential risks of death, personal injury, or server property, or environmental damage. In order to
minimize risks associated with the customer's applications, the customer should provide adequate design and
operating safeguards.
AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT
warrants the performance of its products of the specifications applicable at the time of sale.
REV1.0
- FEB 2019 RELEASED -
- 15 -
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