AP8836 [AITSEMI]
AC-DC PWM CONTROLLER HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER;
| 型号： | AP8836 |
| 厂家： | 
AiT Semiconductor |
| 描述： | AC-DC PWM CONTROLLER HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER |
| 文件： | 总14页 (文件大小：391K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
DESCRIPTION
FEATURES
The AP8836 consists of a Low Standby-Power
Quasi-Resonant (QR) Primary-Side controller and a
650V avalanche-rugged smart power VDMOSFET,
specifically designed for a high performance AC/DC
charger or adaptor with minimal external
components.
Internal 650V avalanche-rugged smart power
VDMOSFET
Internal HV Start-up Circuit, Standby power
consumption < 50mW at 264VAC
Multi-mode and Quasi-Resonant technique
achieve high efficiency, meeting energy star
class VI
AP8836 operates in primary-side sensing and
regulation, so opto-coupler and TL431 could be
eliminated. Because of internal HV Start-up circuit,
the system with AP8836 can achieve less than
50mW standby power consumption (264VAC). In
CV mode, multi-mode and quasi resonant
technique is utilized to achieve high efficiency,
avoid audible noise and make the system meeting
Energy star class VI. Good load regulation is
achieved by the built-in cable drop compensation.
In CC mode, the current and output power setting
can be adjusted externally by the sense resistor at
CS pin. AP8836 offers complete protections
including Cycle-by-Cycle current limiting protection
(OCP), over voltage protection (OVP), over
temperature protection (OTP) and CS open or short
protection (CSO/SP) etc.
±5% CC Regulation at Universal AC input
Primary-side Sensing and Regulation without
TL431 and Opto-coupler
Programmable Cable Drop Compensation
No-need
Control
Loop
Compensation
Capacitance
Excellent Protection Coverage:
Over Temperature Protection (OTP)
VDD Under/Over Voltage
(UVLO&OVP)
Protection
Cycle-by-Cycle Current Limiting (OCP)
Cs Short/Open Protection (CS O/SP)
Available in DIP8 Package
APPLICATION
Switch AC/DC Adaptor
Battery Charger
The AP8836 is available in DIP8 package.
TYPICAL APPLICATION
ORDERING INFORMATION
Package Type
DIP8
Part Number
AP8836P8U
AP8836P8VU
P8
V: Halogen free Package
U: Tube
Note
SPQ: 50pcs/Tube
AiT provides all RoHS products
REV1.0
- DEC 2016 RELEASED -
- 1 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
PIN DESCRIPTION
Top View
Pin #
Symbol
GND
VDD
Function
1
2
Ground
Power supply
The voltage feedback from auxiliary winding. Connected to
resistor divider from auxiliary winding reflecting output voltage.
Current Sense Input
3
4
FB
CS
SW
Avalanche-rugged power MOSFET Drain pin. The Drain pin is
connected to the primary lead of the transformer.
5,6,7,8
TYPICAL POWER
Adapter
Part number
AP8836
Package
85-265 VAC
DIP8
18W
NOTE1: Maximum output power is tested in an adapter at 45°C ambient temperature, with enough cooling conditions.
REV1.0
- DEC 2016 RELEASED -
- 2 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Pin VDD
-0.3V ~ 40V
-0.3V ~ 650V
-0.3V ~ 5.5V
-40℃ ~ 150℃
-55℃ ~ 150℃
40°C/W
High-Voltage Pin, SW
Pin FB, CS
Operating Junction Temperature
Storage Temperature Range
Package Thermal Temperature
Lead Temperature (Soldering, 10Secs)
DIP8
260℃
ESD Protection (HBM, ESDA/JEDEC JDS-001-2014)
±4.0kV
Pulse Drain Current
5A
Stress beyond above listed “Absolute Maximum Ratings” 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.
ELECTRICAL CHARACTERISTICS
TJ =25°C, VDD = 21V, unless otherwise specified
Parameter
Power section
Symbol
Conditions
Min.
650
Typ.
700
Max.
100
Unit
Break-Down Voltage
Off-State Drain Current
Drain-Source On State
Resistance
VBVDSS
IOFF
ISW = 250uA
V
VSW = 500V
uA
RDS(ON)
ISW = 1A,TJ = 25℃
VDD=VDDon - 1V
1.6
30
Ω
Start up Threshold
Supply Voltage Section
Operating Voltage Range
VDD Start up Threshold
VDD Under Voltage
Shutdown Threshold
VDD Over Voltage Protect
Supply Current Section
VDD Charge Current
Operating Current,
Switchings
VSW_START
V
VDD
8
30
V
V
VDDon
14.5
16.5
8.5
34
18.5
VDDoff
7.5
30
9.5
38
V
V
VDDovp
IDD_CH
IDD
VDD=VDDon - 1V, VSW=100V
0.85
0.5
mA
mA
VDD = VDDon ＋1V
0.3
0.7
Operating Current After
Fault
IDD_FAULT
VDD＝15V after fault
0.5
mA
REV1.0
- DEC 2016 RELEASED -
- 3 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
Parameter
Symbol
Conditions
Min.
485
Typ.
Max.
515
Unit
Current Sense Section
Current Sense Threshold
Maximum Current Sense
Threshold
VTH_OC
VTH_OC_MAX
Vcs_min
500
560
170
300
mV
mV
mV
ns
Minimum CS Threshold
Leading Edge Blanking
Time
tLEB
Maximum Ton
tonmax
tD_OC
50
us
ns
OCP Propagation Delay
FB Section
100
Reference Voltage For
Feedback Threshold
Output Over Voltage
Protection Threshold
Output Under Voltage
Threshold
VREF_CV
VFBOVP
VUVP
2.475
2.85
2.5
3
2.525
3.15
V
V
1.55
48
V
Maximum Cable
Icable
VFB=0V
44
52
32
uA
Compensation Current
Minimum Toff
toffmin
toffmax
5
us
Maximum Toff
2.2
ms
Output under Voltage
Protection Blanking Time
Thermal Section
tUVP
FSW= 50kHz
20
ms
Thermal Shutdown
Temperature Threshold
Thermal Shutdown
Hysteresis
TSD
135
150
30
°C
°C
THYST
REV1.0
- DEC 2016 RELEASED -
- 4 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
1.
3.
5.
7.
BV vs. Tj
2.
4.
6.
8.
Rdson vs. Tj
VDDon vs. Tj
Icable vs. Tj
VTH_OC vs. Tj
VDDoff vs. Tj
VDD_OVP vs. Tj
VREF_CV vs. Tj
REV1.0
- DEC 2016 RELEASED -
- 5 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
TYPICAL CIRCUIT
REV1.0
- DEC 2016 RELEASED -
- 6 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
BLOCK DIAGRAM
REV1.0
- DEC 2016 RELEASED -
- 7 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
DETAILED INFORMATION
Functional Description
The AP8836 is a high performance CC/CV primary-side controller. AP8836 operates in primary-side sensing
and regulation, so opto-coupler and TL431 could be eliminated. Proprietary built-in CV and CC control can
achieve high precision CC/CV control meeting most charger and adaptor application requirements. Internal
HV Start-up circuit and the chip’s low consumption help the system to meet strict standby power standard.
HV Start up Control
At start up, the internal high-voltage start-up circuit provides the internal bias and charges the external VDD
capacitor, so that AP8836 starts up quickly. When VDD reaches VDDon, the device starts switching and the
internal high-voltage current source stops charging the capacitor. The device keeps in normal operation
provided as long as VDD keeps above VDDoff
.
After startup, the bias is supplied from the auxiliary transformer winding, the current of HV start-up circuit is
designed to be very low so that the power consumption is very low.
CC Operation Mode
In CC operation mode, the AP8836 captures the auxiliary flyback signal at FB pin through a resistor
dividing-network.
The pulse width of the auxiliary flyback signal determines the AP8836 oscillator frequency. The higher the
output voltage is, the shorter the pulse width is, and the higher the chip oscillator frequency is, thus the
constant output current can be achieved.
The current waveform of DCM mode is shown in Figure 1. During MOSFET turn-on time, the current in the
primary winding (Ipri) ramps up. When MOSFET turns off, the energy stored in the primary winding is
transferred to the secondary side, so the peak current in the secondary winding is
I
sec_pk = Ipri_pk x Nps
(1)
The output current is
Isec_pk
Tdemag
Tp
1
2
Vipk Tdemag
IO =
x
=
(2)
2
Nps Rsense
Tp
Because Vipk is constant and Tp is equal to tow times Tdemag, the output current Io is constant.
REV1.0
- DEC 2016 RELEASED -
- 8 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
Figure 1. The current waveform of DCM mode
CV Operation Mode
In CV mode，AP8836 uses a pulse to sample VFB and it is hold until the next sampling. The sampled voltage is
compared with VREF_CV and the error is amplified. The error amplified output reflects the load condition and
controls the switching off time to regulate the output voltage, thus constant output voltage can be achieved.
The relationship between the output voltage and VREF_CV is
R1+ R2
N
S
VO=(VREF_VC
x
) x
(3)
R2
NAUX
NS means Secondary winding, NAUX means Auxiliary winding
The AP8836 operates in PFM_QR mode during full load mode, since the peak current (Ipeak) of MOSFET is
constant, the chip frequency decreases while the output current decreases. When the switching frequency
approaches to 25kHz, the AP8836 enters PWM_QR mode, the chip frequency decreases slowly while the
output current decreases, the Ipeak decreases while the output current decreases. Therefore the AP8836 can
avoid audible noise, while achieving high efficiency at 25% load conditions. When Vcs decreases to 170mV,
the AP8836 enters Standby mode. In this mode, Ipeak keeps around constant, the chip oscillator frequency
decreases while the output current decreases. Figure 2 illustrates the relations of the switching frequency,
Ipeak and Loading for AP8836.
REV1.0
- DEC 2016 RELEASED -
- 9 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
Figure 2. The Switching Frequency, Vipeak VS. LOAD
Current Sensing and Leading Edge Blanking
Cycle-by-Cycle current limiting is offered in AP8836. The switch current is detected by a sense resistor at CS
pin. The CC set-point and maximum output power can be externally adjusted by external current sense
resistor at CS pin. An internal leading edge blanking circuit chops off the sensed voltage spike at initial power
MOSFET on-state so that the external RC filtering on sense input is no longer needed.
Programmable Cable Drop Compensation
In AP8836, an offset voltage is generated at FB pin by an internal current flowing into the divider resister, as
shown in Figure 3. The Cable Drop Compensation block compensates the voltage drop across the cable. As
the load current decreases from full load to no load, the voltage drop across the cable decreases. It can be
programmed by adjusting the external resistor R2 or R1 at FB pin. The maximum compensation is
V
V
cable
I
cable x (R1// R2)
2.5V
=
(4)
o
Because of the influence of the chip’s sampling position and devices of the system, the actual maximum
compensation is less than theoretical value.
REV1.0
- DEC 2016 RELEASED -
- 10 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
Figure 3. Icable
Reference Negative Temperature Compensation
As shown in Figure 3, the voltage of FB pin is
R2 x NAUX
(R1+ R2) x NS
VFB = K(Vo + ΔV), K =
(5)
Where ΔV has a negative temperature coefficient, K is a constant.
In AP8836, the voltage reference uses the negative temperature compensation technology. At room
temperature, the voltage reference is 2.5V. The voltage reference (VREF_CV) decreases while the temperature
of chip increases. The reference negative temperature compensation block compensates the △V, thus the
output voltage keeps constant at full range of temperature. The reference negative temperature
compensation improves output precision.
Quasi-Resonant Switching
The AP8836 incorporates a unique proprietary quasi-resonant switching scheme that achieves valley-mode
turn on for every switching cycle in CV mode. This unique feature greatly reduces the switching loss. The
actual switching frequency can vary slightly cycle by cycle, providing the additional benefit of reducing EMI.
Figure 4. QR Mode
REV1.0
- DEC 2016 RELEASED -
- 11 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
Protection Control
The AP8836 has several self-protection functions, such as Cycle-by-Cycle current limiting (OCP),
Over-Voltage Protection, Over-Temperature Protection, Feedback Loop open Protection, Output short circuit
Protection, CS resistor open/short circuit Protection and Under Voltage Lockout on VDD. All protections are
self-recovered.
REV1.0
- DEC 2016 RELEASED -
- 12 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
PACKAGE INFORMATION
Dimension in DIP8 (Unit: mm)
Symbol
A
Min
3.60
0.51
3.00
1.55
0.44
0.43
Max
4.00
-
A1
A2
A3
b
3.40
1.65
0.53
0.48
b1
B1
c
1.52BSC
0.24
0.23
9.05
6.15
0.32
0.27
9.45
6.55
c1
D
E1
e
2.54BSC
7.62BSC
eA
eB
eC
L
7.62
0.00
3.00
9.30
0.84
-
REV1.0
- DEC 2016 RELEASED -
- 13 -
AP8836
AC-DC PWM CONTROLLER
AiT Semiconductor Inc.
www.ait-ic.com
HIGH PRECISION CC/CV PRIMARY-SIDE CONVERTER
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 servere 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
- DEC 2016 RELEASED -
- 14 -
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