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AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 1 - DESCRIPTION FEATURES The AP8022 consists of a Pulse Width Modulator (PWM) controller and a power MOSFET, specifically designed for a high performance off -line converter with minimal external components. AP8022 offers complete protection coverage with automatic self-recovery feature including Cycle- by-Cycle current limiting (OCP), over temperature protection (OTP), under-voltage Lockout protection(UVLO)，V DD over-voltage protection(OVP), and soft -start. Burst mode operation and device very low consumption helps to meet the standby energy saving regulations. Excellent EMI performance is achieved with frequency modulation. The device consists of a high voltage start-up circuit in order to reduce the system set-up time. The device provides an advanced platform well suited for low standby -power and cost-effective flyback converters. The AP8022 is available in DIP8 package.
ORDERING INFORMATION
V: Halogen free Package U: Tube SPQ: 50pcs/Tube AiT provides all RoHS products Suffix “ V “ means Halogen free Package Integrated 800V avalanche- rugged power MOSFET 85V to 265V wide range AC voltage input Semi enclosed steady output power 10W@85~265VAC Frequency modulation for low EMI Burst-mode Operation Built-in Soft Start Internal HV Start-up Circuit Excellent Protection: Over Current Protection (OCP) Over Temperature Protection (OTP) VDD over-voltage protection (OVP) Available in DIP8 Package APPLICATION Electromagnetic Oven power supplies Small household application power supplies DVB/DVD Power TYPICAL APPLICATION
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 2 - PIN DESCRIPTION Top View Pin # Symbol Function 1, 2 GND Ground
3 COMP
Voltage feedback. By connecting a opto-coupler to close the control loop and achieve the regulation. 4 VDD Positive Supply voltage Input.
5 NC No connection
6,7,8 SW The SW pin is designed to connect directly to the primary lead of the transformer. TYPICAL POWER Package AC line continuous powerNOTE1 Peak powerNOTE2 DIP8 85~265 VAC 10W(12V 800mA) 12W(12V 1A) NOTE1: Maximum output power in a semi enclosed design measured at 75°C ambient temperature, Duration:2 hours NOTE2: Peak power in a semi enclosed design measured at 75°C ambient temperature, Duration:1 min
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS Supply voltage Pin VDD -0.3V~45V High-Voltage Pin, SW -0.3V~750V COMP -0.3V~7V Junction Temperature -40℃~150℃ Storage Temperature -55℃~150℃ Lead Temperature (Soldering, 10secs) 260℃ Electrostatic Discharge Human Body Mode (HBM, ESDA/JEDEC JDS-001-2014) ±4kV ESD Voltage ProtectionNOTE3 (Air discharge to pins of AP8022 with ESD Generator) 8kV Drain Pulse Current (Tpulse=100μs） 3A 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. NOTE3: Enterprise internal standards, for reference only.
ELECTRICAL CHARACTERISTICS
TJ =25°C, VDD = 15 V, unless otherwise specified Power section Parameter Symbol Conditions Min. Typ. Max Unit VDMOS Breakdown Voltage BVDSS ISW =250μA 750 800 V Static Drain-Source off Current IOFF VSW =550V 100 μA Static Drain-Source on Resistance RDSON ISW = 400mA, TJ =25°C 10 Ω Control section Parameter Symbol Conditions Min. Typ. Max Unit UVLO SECTION VDD Start Threshold Voltage VSTART VCOMP=0V 13 14.5 16 V VDD Stop Threshold Voltage VSTOP VCOMP=0V 7 8 9 V VDD Threshold Hysteresis VHYS 6.5 V VDD Reset Voltage VRST 5.5 6 6.5 V
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 4 - Parameter Symbol Conditions Min. Typ. Max Unit OSCILLATOR SECTION Initial Accuracy FOSC TA = 25°C 54 60 66 kHz Frequency Variation FD ±6 kHz Modulation Frequency FM 250 Hz Maximum Duty Cycle DMAX 65 80 90 % FEEDBACK SECTION Feedback Shutdown Current ICOMP 1.2 mA COMP Pin Input Impedance RCOMP 1.15 kΩ CURRENT LIMIT SECTION Peak Current Limit ILIM TA = 25°C 0.6 0.75 0.9 A Minimum Turn On Time tLEB LEB time 650 ns Soft-start Time tSS 7.5 ms Peak Drain Current During Burst Mode ID_BM 150 mA PROTECTION SECTION Thermal Shutdown Temperature TSD 140 170 ℃ Thermal Shutdown Hysteresis THYST 30 ℃ SUPPLY CURRENT SECTION Startup Charging Current (SW pin) ICH VDRAIN = 105V, VCOMP = GND, VDD = 12V -1.25 mA Operating Supply Current, Switching IDD VDD = 16V, VCOMP= 0V 4 mA Operating Voltage Range VDD After turn-on 10 35 V VDD Over Voltage VOVP 37 40 43 V Operating Supply Current with VDD < VSTOP IDD_OFF VDD = 6V 100 400 μA
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 5 - TYPICAL PERFORMANCE CHARACTERISTICS 1. RDS(on) vs.TJ 2. BVDSS vs.TJ 3. VSTART vs.TJ 4. VSTOP vs.TJ 5. VOVP vs.TJ 6. FOSC vs.TJ
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 6 - TYPICAL CIRCUIT
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 7 - DETAILED INFORMATION Functional Description Startup This device includes a high voltage start up current sour ce connected on the SW of the device. As soon as a voltage is applied on the input of the converter, this start up current source is activated and to charge the V DD capacitor as long as VDD is lower than VSTART. When reaching VSTART, the start up current source is cut off and VDD is sourced by auxiliary side. As VDD falls below VSTOP, the HV-Start circuit won’t work immediately until VDD is lower than VRST. Fig 1. Startup circuit 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 help to prevent the transformer turning into the saturation states. Typically, the duration of soft-start is 7.5ms. Gate driver The internal power MOSFET in AP8022 is driven by a dedicated gate driver for power switch control. Too weak the gate driver strength results in higher conduction and switch loss of MOSFET while too strong gate drive results in worse EMI. A good tradeoff is achieved through the bui lt-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. Oscillator The switching frequency of AP8022 is internally fixed at 60 kHz. No ex ternal frequency setting components are required for PCB design. The frequency modulation is implemented in AP8022. So that, it minimizes the conduction band EMI and therefore eases the system design because the tone energy could be spread out.
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 8 - Feed-back A feedback pin controls the operation of the device. Unlike conventional PWM control circuits which use a voltage input, the COMP pin is sensitive to current. Fig. 2 presents the internal current mode structure. The Power MOSFET delivers a sense current which is proportional to the main current. R2 receives this current and the current coming from the COMP pin. The voltage across R2 (V R2) is then compared to a fixed reference voltage. The MOSFET is switched off when VR2 equals the reference voltage. Fig 2. Feedback circuit Leading Edge Blanking (LEB) At the instant the internal Sense FET is turned on, there usually exists a high current spike through the Sense FET, caused by the primary side capacitance and secondary side rectifier diode reverse recovery. Excessive voltage across the sense resistor would lead to false feedback operation in the current mode PWM control. To counter this effect, the device employs a leading edge blanking (LEB) circuit. This circuit inhibits the PWM comparator for a short time (typically 650ns) after the Sense FET is turned on. Under Voltage Lock Out Once fault condition occurs, switching is terminated and the Sense FET remains off. This causes V DD to fall. When VDD reaches the V DD reset voltage, 6V, the protection is reset and the internal high voltage current source charges the VDD capacitor. When VDD reaches the UVLO start voltage, 14.5V, the device resumes its normal operation. In this manner, the auto- restart can alternately enable and disable the swit ching of the power Sense FET until the fault condition is eliminated. Thermal Shutdown (TSD) The Sense FET and the control IC are integrated in the same chip, making it easier for the control IC to detect the temperature of the Sense FET. When the tempera ture exceeds approximately 170 °C, thermal shutdown is activated, the device turn off the Sense FET. The device will go back to work when the lower threshold temperature about 140°C is reached.
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 9 -
PACKAGE INFORMATION
Dimension in DIP8 (Unit: mm) Symbol Min Max A 3.60 4.00 A1 0.51 - A2 3.00 3.40 A3 1.55 1.65 b 0.44 0.53 b1 0.43 0.48 B1 1.52BSC c 0.24 0.32 c1 0.23 0.27 D 9.05 9.45 E1 6.15 6.55 e 2.54BSC eA 7.62BSC eB 7.62 9.30 eC 0.00 0.84 L 3.00 -
AiT Semiconductor Inc. www.ait-ic.com AP8022 AC-DC PWM CONTROLLER LOW STANDBY-POWER OFF-LINE PWM CONVERTERS REV2.0 - NOV 2008 RELEASED, NOV 2016 UPDATED - - 10 - 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 or ders, 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 appl ications. 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 associa ted 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.