HA16138PS AC/DC Switching Converter Controller IC With High-Voltage Power MOS FET ADE-204-032 (Z) Preliminary 1st Edition MAY 2000 Description The HA16138PS is an IC with a high-voltage power MOS FET and current-mode type PWM controller mounted in a DILP-8 (DP-8) standard package, suitable for low-power power supplies in the 10 W class and below. The HA16138PS includes an energy-saving mode for holding down power consumption when on standby (no load). When the energy-saving mode is entered, the operating frequency is reduced to 1/4 the normal frequency, reducing power consumption. A starter circuit is also provided on-chip, eliminating the need for the external start-up resistance needed with previous controller ICs. The starter circuit in this IC is turned off automatically after the IC starts up, enabling the start-up resistance power consumption to be decreased. The HA16138PS includes a soft start circuit, OVP circuit, and remote on/off circuit, making it possible to configure a simple protection circuit with fewer external parts than previously. Also provided are a current sense resistance and a leading edge blanking circuit that masks spike noise on current sense input, making noise reduction in a power supply set comparatively easy. The HA16138PS is equipped with an error amp circuit inverting input (FB) pin and output (COMP) pin, enabling special-purpose design for both flyback system secondary-side output voltage detection and primary-side back-up transformer output voltage detection types. Features • Built-in high-voltage power MOS FET • Energy-saving mode (power saving through reduction of operating frequency to 1/4 normal frequency when on standby) • Built-in starter circuit, reducing power loss of start-up resistance when on standby (external start-up resistance not necessary) • Built-in soft start circuit, eliminating need for external connection • Remote on/off function, enabling power saving by halting PWM output without turning off power supply • Built-in current sense resistance and leading edge blanking circuit, for sense-resistance-less and noisecancellation-filter-less implementation • Built-in over voltage protection circuit • Built-in over temperature protection circuit HA16138PS Pin Arrangement DRAIN 1 DRAIN 2 VDD 3 8 SOURCE DILP-8 (DP-8) FB 4 7 SGND 6 CT 5 COMP (Top view) Pin Functions Pin No. Pin Name Pin Function 1 DRAIN On-chip power MOS FET drain pin / starter circuit input pin 2 DRAIN On-chip power MOS FET drain pin / starter circuit input pin 3 VDD Power supply voltage input pin 4 FB Error amplifier inverting input pin / OVP latch circuit input pin 5 COMP Error amplifier output pin 6 CT Timing capacitance connection pin / on/off circuit input pin 7 SGND Primary-side common connection pin 8 SOURCE On-chip power MOS FET source pin 2 HA16138PS Block Diagram VDD + − ON/OFF Comp. VDD CT Starter Vref Generator UVL UVL Oscillator 1/4 Divider Driver FF CK + − − + D Q + − Frequency Down Comp. Vref FB DRAIN CS Comp. 1/3 Attenuator E-AMP Rcs VDD Vref R Q + − TSD Delay Leading Edge Blanking + − S OVP Latch SOURCE UVL Soft Start COMP 3 HA16138PS Absolute Maximum Ratings (Ta = 25°C) Item Power MOS FET block Controller block Overall 4 Symbol Rating Unit Drain-source voltage VDS −0.3 to 700 V Maximum drain current I DS 0.5 A Power supply voltage VDD 0 to 15 V CT pin voltage VCT 0 to V DD V FB pin voltage VFB 0 to V DD V COMP pin voltage VCOMP 0 to 5 V Operating temperature Topr −20 to +85 °C Junction temperature Tjmax +150 °C Storage temperature Tstg −55 to +150 °C HA16138PS Electrical Characteristics (Tj = 25°C, VDD = 12 V, fosc1 = 100 kHz) Item Symbol Min Typ Max Unit Power Drain-source voltage BV DSS 700 V MOS FET Drain-source on resistance RDS(on) 12 20 Ω Starter Start-up start drain voltage VDRN 55 75 95 V circuit Start-up charge current ICHG 125 250 500 µA UVL circuit Operation start power supply voltage VTH 10 11 12 V Operation stop power supply voltage VTL 7 8 9 V Test Conditions ID = 0.4 A Operating power supply current IDD 2.5 4.0 mA Oscillation Normal mode operating frequency fosc1 88 100 112 kHz CT = 220 pF circuit F-down mode operating frequency fosc2 22 25 28 kHz CT = 220 pF, VCOMP = 0 V Maximum on duty Dumax 70 % Error Open-loop voltage gain AV 50 65 dB Rcomp = 220 kΩ amplifier Unity gain bandwidth BW 550 kHz Rcomp = 220 kΩ Output high voltage 1 VCOMPH1 4.5 5.0 V Iosource = 0 µA Output high voltage 2 VCOMPH2 4.3 4.8 V Iosource = 100 µA Output low voltage VCOMPL 0.50 0.75 V Iosink = 0 µA Non-inverting input voltage V(+)EA 3.4 3.8 4.2 V Power Output rise time tr 100 ns CL = 1000 pF MOS FET Output fall time tf 80 ns CL = 1000 pF gate drive Output high voltage VOH 10 V Iosource = 25 mA circuit Output low voltage VOL 0.5 V Iosink = 25 mA Current Current sense voltage gain AVCS 3.0 V/V sense Current sense response time tpdcs 200 ns circuit Leading edge blanking time tBL 300 ns OVP latch OVP latch set voltage Vovp 4.2 5.0 5.8 V Vovp: FB pin voltage circuit OVP latch reset voltage Vovpr 4.0 V Vovpr: VDD pin voltage OVP latch current dissipation Iovp 1.1 1.7 mA VFB = 6.0 V Remote on/off circuit Off mode start voltage Voff 3.6 3.8 4.0 V Voff: CT pin voltage Soft start circuit Soft start time tst (1.0) 2.0 (3.0) ms Time from start-up to max. duty f-down comparator F-down mode start voltage Vfdcp 0.7 0.85 1.0 V Over temperature protection circuit Over temperature protection start temperature TSD 150 °C Vcomp = 5.0 V TSD: Power MOS FET junction temperature 5 HA16138PS Functional Description Note: Unless specified otherwise, characteristic values in the text and figures are typical values or design values. Starter Circuit When power is turned on, the starter circuit operates during standby mode, and a constant current is supplied from the drain pins to the VDD pin. This constant current supplies the external capacitance charge current for charging up the VDD pin and the standby current consumed by the IC itself while on standby. Therefore, the start-up bleeder resistance required by previous products with no on-chip starter circuit is no longer necessary. The starter circuit detects both the drain voltage and the VDD pin voltage, and controls VDD so that the IC does not start up if the drain voltage is less than 75 V. Vb+ 0 75V DRAIN 0 Istart 0 11V 8V VDD 0 CT COMP 0 0 DC OUTPUT 0 Figure 1 Start-Up Timing UVL Circuit The UVL circuit is a function that monitors the VDD voltage, and stops IC operation if VDD is low. The VDD detection voltage has a hysteresis characteristic; the operating start VDD voltage is 11 V, and the operation stop voltage, 8 V. In standby mode at the operation stop voltage or below, the UVL circuit keeps the power MOS FET turned off, and performs control of soft start circuit resetting, internal reference voltage circuit stoppage, and so forth. 6 HA16138PS Error Amplifier The error amplifier comprises a constant-current source type Pch top differential amplifier. As the inverting input (FB) pin and output (COMP) pin are provided as external pins, use for both a simple flyback power supply back-up voltage feedback type and a high-precision secondary voltage detection type is possible. Current Sense Circuit This is a 200 ns high-speed comparator circuit suitable for current mode control. The current sense controller reference voltage depends on the COMP pin voltage, being always 1/3 of the COMP pin voltage. Driver Osc. Power MOS FET FF + − Current sense comparator − + Error amplifier 2R 300 ns Delay circuit Leading edge blanking Current sense resistance R 1/3 attenuator Figure 2 Current Sense Peripheral Circuitry Leading Edge Blanking Circuit The on-chip leading edge blanking circuit masks the current sense comparator input signal for a period of 300 ns after the power MOS FET gate voltage goes high. This reduces the erroneous operation due to spike-shaped noise caused by discharge of various capacitance components when the power MOS FET is turned on. 7 HA16138PS Oscillation Circuit The oscillator generates a triangular voltage waveform through the discharge of the timing capacitance CT. With a 220 pF CT connected, the oscillator operates at 100 kHz. The triangular voltage waveform has a discharge time ratio of 3:1, with the charge side set to PWM onpulses, and the discharge side to dead-band pulses. The maximum PWM on duty can be controlled up to 70%. CT DB pulse (IC internal waveform) 1/3∗COMP (IC internal waveform) CS (IC internal waveform) Power MOS FET Gate voltage (IC internal waveform) Power MOS FET Drain voltage Figure 3 Oscillation Circuit Peripheral Waveform Timing OVP Latch Circuit When the FB pin voltage reaches 5 V or above, the OVP latch circuit operates and forcibly stops PWM output and the reference voltage generation circuit. While OVP latching is stopped, the starter circuit is also stopped. Latch resetting can be performed by driving power supply voltage VDD to 4 V or below. DRAIN 0 CT 0 5V FB 0 Vref (IC internal waveform) 5V 0 Figure 4 OVP Latch Operation Timing 8 HA16138PS Remote On/Off Circuit When the CT pin voltage is pulled up to 3.8 V or above, the remote on/off circuit operates and PWM output can be stopped without turning off the power supply. When stoppage is executed by means of the on/off circuit, PWM output and the starter circuit are stopped, and the soft start circuit is reset, but the reference voltage generation circuit does not stop. DRAIN 0 3.8V CT Vref (IC internal 5V waveform) Figure 5 Remote On/Off Operation Timing Soft Start Circuit This circuit implements a soft start function with a 2 ms time constant without the use of external parts. During a soft start, the PWM output pulse width gradually increases. The soft start time is defined as the time from the point at which the UVL circuit start voltage is exceeded to the point at which PWM output reaches its maximum duty. 9 HA16138PS f-down Comparator An "energy-saving mode" is provided to hold down power consumption during standby, with the operating frequency in the unloaded state reduced to 1/4 of its steady operation value. The f-down comparator detects the COMP pin voltage, and if it falls to 0.85 V or below, switches to energy-saving mode. As COMP pin voltage detection is performed pulse-by-pulse, a skip mode comes into effect in the vicinity of the threshold voltage according to the timing. VCT VCOMP VDRAIN Normal mode Energysaving mode Normal Energymode saving mode Figure 6 Energy-Saving Mode Switching Waveform Timing Over Temperature Protection Circuit If the power MOS FET junction temperature reaches +150°C, the over temperature protection circuit operates, shutting down the IC. The over temperature protection circuit is coupled to the OVP latch circuit, so that the latch is reset if the power supply voltage is driven to 4 V or below while the junction temperature is lower than the overheating protection start temperature. 10 HA16138PS Main Characteristics Operating Frequency vs. Timing Capacitance 1000 300 fosc (kHz) normal mode operating frequency 100 30 f-down mode operating frequency 10 100 200 300 400 500 CT (pF) 1000 Start-up Current (Charge Current + Standby Current) vs. Drain Voltage 500 450 Idrain (µA) 400 350 300 250 200 150 100 50 0 0 10 20 30 40 50 Vdrain (V) 60 70 80 70 80 Power Supply Voltage vs. Drain Voltage 12 VDD (V) 10 8 6 4 2 0 0 10 20 30 40 50 Vdrain (V) 60 11 HA16138PS Error Amplifier Output High Voltage vs. Output Source Current 6.0 5.0 VOH (V) 4.0 3.0 2.0 1.0 0 0 100 200 300 400 500 Iosource (µA) 600 700 800 Error Amplifier Output Low Voltage vs. Output Sink Current 2.5 VOL (V) 2.0 1.5 1.0 0.5 0 0 12 200 400 600 Iosink (µA) 800 1000 HA16138PS Operating Frequency (Normal Mode) vs. Ambient Temperature 110 108 106 fosc (kHz) 104 102 100 98 96 94 92 90 −25 0 25 50 75 100 Ta (°C) Operating Start/Stop Power Supply Voltage vs. Ambient Temperature 13 VTH, VTL (V) 12 VTH 11 10 9 VTL 8 7 6 −25 0 25 50 75 100 Ta (°C) 13 HA16138PS θj-a (°C/W) 100 Pt(max) for Ta = +85°C 80 2.0 1.5 60 1.0 θj-a 40 0.5 20 0 10 20 30 Length of copper, L (mm) 2.0 oz copper heat sink 40 Maximum power dissipation (W) Thermal Resistance θj-a and Maximum Power Dissipation vs. Printed Circuit Board Copper Heat Sink Perimeter Length 120 2.5 0 50 Glass-epoxy printed circuit board Pin holes L L Wiring pattern Figure 7 Sample Printed Circuit Board Copper Heat Sink Pattern 14 HA16138PS Application Circuit Examples 1 The application circuit example shown here detects the secondary-side output voltage of a flyback power supply. Secondary-side output voltage detection and feedback are performed by a shunt regulator and photocoupler. When the OVP latch function is used for secondary-side output voltage overvoltage protection, the FB pin should be pulled up to VDD by the shunt regulator and photocoupler. Transformer P: 90T / 1.43mH S: 6T / 8.1µH B: 14T / 30.8µH AC INPUT P 2200p 0.1µ 100µ 400V + Line Filter S 51k VR 260V OVP detection circuit (7.4V) SBD HRW26F + 15µ + R3 330 + R4 1.8k C4 0.022µ 560µ 180µ 25V 25V B : Primary GND R8 330 : Secondary GND R6 4.7k R5 3.3k K K A REF HA17431VP R9 1.8k C5 3.3µ R11 2.4k DC OUTPUT 5V/2A R10 3.3k A REF R7 2.4k HA17431VP R12 2.4k − HA16138PS 1 DRAIN SOURCE 8 2 DRAIN SGND 7 OVP feedback circuit 3 VDD 4 FB R1 VR 120k 15V + C1 47µ 20V * The secondary-side output voltage is stabilized at a value determined by the bleeder resistance of the secondary-side shunt regulator. VOUT(reg) = Vref(shunt) × R11 + R12 R12 2.4kΩ + 2.4kΩ = 2.5V × 2.4kΩ = 5.0V CT 6 COMP 5 C3 R2 C2 15k 2200p 220p Photo coupler Units R: Ω C: F When the OVP latch function is used, the secondary-side voltage is detected by the shunt regulator, and feedback to the FB pin is performed by the photocoupler. The OVP detection level is determined by the following formula. VOUT(ovp) = Vref(shunt) × R6 + R7 R7 4.7kΩ + 2.4kΩ = 2.5V × 2.4kΩ = 7.4V 15 HA16138PS Application Circuit Examples 2 The application circuit example shown here detects the primary-side back-up output voltage of a flyback power supply. As the back-up output voltage, VDD is resistance-divided and feedback is performed to the FB pin. The back-up output voltage and secondary-side output voltage are proportional to the ratio of transformer windings. Using this characteristic enables the system to be configured with simple circuitry as shown in the figure below. The VDD-to-FB feedback resistance can also be used as the back-up output voltage OVP detection resistance. Transformer P: 90T / 1.43mH S: 6T / 8.1µH B: 14T / 30.8µH AC INPUT P 2200p 0.1µ S 51k 100µ 400V + + VR 260V Line Filter 560µ 25V + 180µ 25V B : Primary GND + 15µ SBD HRW26F DC OUTPUT 5V/1A − : Secondary GND HA16138PS 1 DRAIN SOURCE 8 R1 240k 2 DRAIN 3 VDD 4 FB R2 VR 120k 15V + C1 47µ 20V * If feedback resistance R1 = 240 kΩ and R2 = 120 kΩ, feedback is performed so that the FB pin voltage is non-inverting input voltage V(+)EA, and the VDD voltage is stabilized. VDD(reg) = V(+)EA × R1 + R2 R2 = 3.8V × 240kΩ + 120kΩ 120kΩ = 11.4V 16 SGND 7 CT 6 COMP 5 C2 0.1µ R3 1M R4 15k C3 C4 2200p 220p Units R: Ω C: F When the FB pin voltage reaches OVP latch set voltage Vovp, the OVP latch circuit operates, shutting down the IC. The VDD voltage in this case is given by the following formula. VDD(ovp) = Vovp × R1 + R2 R2 = 5.0V × 240kΩ + 120kΩ 120kΩ = 15V HA16138PS Application Circuit Examples 3 As this IC is provided with a remote on/off function, it is possible to implement power management without turning off the power supply. Using a remote on/off control circuit as shown in the figure below, the CT pin voltage is pulled up to the off mode start voltage or above, and the IC is stopped. In the off mode, control of PWM output stoppage, soft start resistance resetting, and starter circuit stoppage is performed without stopping the internal reference voltage generation circuit. With this function, also, latch operation is not performed, and an auto-restart is executed as soon as the CT pin voltage falls below the off mode start voltage. It is recommended that the remote on/off control signal be controlled by a microcomputer or other logic signal. Remote ON/OFF control circuit R2 43k 2SA1029 HA16138PS R1 10k 1 DRAIN SOURCE 8 2 DRAIN 3 VDD 4 FB R3 130k SGND 7 CT 6 COMP 5 R4 10k CT 220p 2SC458 ON/OFF H: OFF L: ON Units R: Ω C: F 17 HA16138PS Laser Marking Specifications Product code Lot indication and Management code HA16138 PS 123 Lot Indication and Management Code Contents 1 : The last digit of the production year. 2 : Production month code 3 : Management code Production month 1 2 3 4 5 6 7 8 9 10 11 12 Month code A B C D E F G H J K L M 18 HA16138PS Package Dimensions Unit: mm 6.3 7.4 Max 9.6 10.6 Max 8 5 4 1.3 0.1 Min 1.27 Max 2.54 ± 0.25 7.62 2.54 Min 5.06 Max 1 0.89 0.48 ± 0.10 + 0.10 0.25 – 0.05 0° – 15° Hitachi Code JEDEC EIAJ Weight (reference value) DP-8 Conforms Conforms 0.54 g 19 HA16138PS Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party’s rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi’s sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. 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Ltd. 16 Collyer Quay #20-00 Hitachi Tower Singapore 049318 Tel: 535-2100 Fax: 535-1533 Hitachi Asia Ltd. Taipei Branch Office 3F, Hung Kuo Building. No.167, Tun-Hwa North Road, Taipei (105) Tel: <886> (2) 2718-3666 Fax: <886> (2) 2718-8180 Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road, Tsim Sha Tsui, Kowloon, Hong Kong Tel: <852> (2) 735 9218 Fax: <852> (2) 730 0281 Telex: 40815 HITEC HX Copyright ' Hitachi, Ltd., 2000. All rights reserved. Printed in Japan. 20