HI-SINCERITY MICROELECTRONICS CORP. H6849 Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : Page No. : 1/13 Series Novel Low Cost Green-Power PWM Controller Features z z z z z z z z z Low Cost, PWM&PFM&CRM Low Start-up Current (about 10μA) Low Operating Current (about 2mA) Current Mode Operation Under Voltage Lockout (UVLO) Built-in Synchronized Slope Compensation Programmable PWM Frequency Leading edge Blanking on Sense input Constant output power limiting for z z z z universal AC input Cycle-by-cycle current limiting Clamped gate output voltage 16.5V Over voltage protect 26.7V High-Voltage CMOS Process with ESD z SOT-23-6L、SOP-8 & DIP-8 Pb-Free z Packaging Compatible with SG5701 & SG5848 & LD7535 &OB2263/2263 z z Open Frame Switching Power Supply 384X Replacement Applications z z Switching AC/DC Adaptor Battery Charger General Description The H6849 is a highly integrated low cost current mode PWM controller, which is ideal for small power current mode of offline AC-DC fly-back converter applications. Making use of external resistors, the IC changes the operating frequency and automatically enters the PFM/CRM under light-load/zero-load conditions. This can minimize standby power consumption and achieve green-power functions. With a very low start-up current, the H6849 could use a large value start-up resistor (1.5Mohm). Built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic oscillation. Dynamic peak limiting circuit minimizes output power change caused by delay time of the system over a universal AC input range. Leading H6849P, H6849S,H6849NF edge blanking circuit on current sense input could remove the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. Pulse-by-pulse current limiting ensures safe operation even during short-circuit. The H6849 offers more protection like OVP (Over Voltage Protection) and OCP (Over current protection). The H6849’s output driver is clamped to maximum 16.5V to protect the power MOSFET. Excellent EMI performance is achieved soft switching control at the totem pole gate driver output. H6849 is offered in SOT-23-6, SOP-8 and DIP-8 packages. HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 2/13 Pin Assignment Part Number Description H6849NF SOT26, Pb-free,in T/R H6849S SOP-8, Pb-free in T/R H6849P DIP-8, Pb-free in Tube Pin Connection (Top View) Package Function SOT-26 6 5 4 1 2 3 SOT-26 8 1 7 2 6 3 5 DIP-8 Pin6: GATE Pin1: GATE Totem-pole output to drive the external power MOSFET which is internally clamped below 18V Pin5: VDD Pin2: VDD Power Supply The internal protection circuit disables PWM output if VDD is over voltage.. Pin3: NC NC Pin. Pin4: SENSE Pin4: SENSE Current sense pin, a resistor connects to sense the MOSFET current. Pin3: RI Pin5: RI This pin is to program the switching frequency. By connecting a resistor to ground to set the switching frequency. Pin6: NC NC Pin Pin7:FB Voltage feedback pin.Output current of this pin could controls the PWM duty cycle, If FB voltage exceeds the threshold; the internal protection circuit disables PWM output. 4 DIP -8(SOP-8) Description Pin1: FB Pin1: GND Pin8: GND GND Pin Block Diagram Simplified Internal Circuit Architecture H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 3/13 Absolute Maximum Ratings Symbol VDD IOVP VFB VSEN PD TL TSTG Parameter Supply voltage Pin Voltage VDD OVP maximal enter current Input Voltage to FB Pin Input Voltage to SEN Pin Power Dissipation ESD Capability, HBM Model ESD Capability, Machine Model 20 second Lead Temperature SOT-23-6L (Soldering) 10 second DIP-8 Storage Temperature Range Rating 40 20 -0.3 to 6V -0.3 to 6V 300 2000 200 Unit V mA V V mW V V 220 ℃ 260 ℃ -55 to + 150 ℃ RECOMMENDED OPERATION CONDITION Symbol Min ~ Max Unit VDD Supply Voltage 12~20 V RI RI PIN Resistor Value 58~120 K ohm TOA Operation Ambient Temperature -20~85 ℃ PO Output Power 0~60 W 48~100 kHz VDD FPWM Parameter Frequency of PWM TYPICAL APPLICATION H6849 H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 4/13 MICROELECTRONICS CORP. Electrical Characteristics (Ta=25°C unless otherwise noted, VDD = 15V.) Symbol Parameter Conditions Min. Typ. Max. Unit Supply Voltage (VDD Pin) IST ISS Startup Current Operating Current 10 μA VFB=0V 2.8 mA VFB=3V 2.3 mA VFB=Open 1.46 mA VDDON Turn-on Threshold Voltage 16.1 V VDDOFF Turn-off Threshold Voltage 11.1 V VDCLAMP VDD Clamp Voltage IVDD=20mA 26.7 V Voltage Feedback (FB Pin) IFB Short Circuit Current VFB=0V 2.8 mA VFB Open Loop Voltage VFB=Open 4.8 V IPFM Enter PFM, FB current 0.92 mA ICRM Enter CRM, FB current 1.5 mA 0.87 V Current Sensing (SEN Pin) VTH_L Minimum Voltage Lever 0.83 VTH_H Maximum Voltage Lever 1.0 TPD Delay to Output 300 ns RCS Input Impedance 50 KΩ 1.05 V Oscillator (RI Pin) FOSC Normal Frequency RI=100Kohm FPFM PFM Frequency RI=100Kohm 11.6 KHZ DCMAX Maximum Duty Cycle RI=100Kohm 75 % ΔFTEMP Frequency Temp. Stability -30-85℃ 5 % 300 nS TBLANK 53 Leading-Edge Blanking Time 58 63 KHz GATE Drive Output (GATE Pin) VOL Output Low Level VDD=15V, IO=20mA VOH Output High Level VDD=15V, IO=20mA TR Rising Time CL=1000pF 450 ns TF Falling Time CL=1000pF 130 ns Output Clamp Voltage VDD=20V 16.5 V VGCLAMP H6849P, H6849S,H6849NF 1 8 V V HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 5/13 TYPICAL CHARACTERISTICS VDD startup Current VS Temperature Duty cycle VS Temperature VDD (OFF) VS Temperature VDD startup Current VS Temperature VDD Operation Current VS Temperature OVP VS Temperature H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. PWM frequency VS Temperature Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 6/13 FOSC VS FB Current FOSC VS RI pin resistor H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. OPERATION DESCRIPTION Current Model Compared to voltage model control, current model control has a current feedback loop. When the voltage of the sense resistor peak current of the primary winding reaches the internal setting value VTH, comparator reverse, register reset and power MOSFET cut-off. So that to detect and modulate the peak current cycle by cycle could control the output of the power supply. The current feedback has a good linear modulation rate and a fast input and output dynamic impact avoid the pole that the output filter inductance brings and the second class system descends to first class and so it widens the frequency range and optimizes overload protection and short circuit protection. Startup Current and Under Voltage Lockout The startup current of H6849 is set to be very low so that a large value startup resistor can therefore be used to minimize the power loss. For AC to DC adaptor with universal input range design, a 1.5 MΩ, 1/8 W startup resistor and a 10uF/25V VDD hold capacitor could be used. The turn-on and turn-off threshold of the H6849 is designed to 16.1V/11.1V. During startup, the hold-up capacitor must be charge to 16.1V through the startup resistor. The hysteresis is implemented to prevent the shutdown from the voltage dip during startup. Internal Bias and OSC Operation A resistor connected between RI pin and GND pin set the internal constant current source to charge or discharge the internal fixed cap. The charge time and discharge time determine the internal clock speed and the switching frequency. Increasing the resistance will reduce the value of the input current and reduce the switching frequency. The relationship between RI pin and PWM switching frequency follows the below equation within the RI allowed range. FOSC = Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 7/13 generate a 50uA constant current and a 58kHz PWM switching frequency. The suggested operating frequency range of H6849 is within 48KHz to 100KHz. Green Power Operation The power dissipation of switching mode power supply is very important in zero load or light load condition. The major dissipation result from conduction loss、switching loss and consume of the control circuit. However, all of them related to the switching frequency. There are many difference topologies has been implemented in different chip. The basic operation theory of all these approaches intended to reduce the switching frequency under light-load or no-load condition. H6849`s green power function adapts PWM、PFM and CRM combining modulation. When RI resistor is 100k, the PWM frequency is 58kHz in medium or heavy load operation. Through modifying the pulse width, H6849 could control output voltage. The current of FB pin increases when the load is in light condition and the internal mode controller enters PFM&PWM when the feedback current is over 0.92mA. The operation frequency of oscillator is to descend gradually. The invariable frequency of oscillator is 11.6kHz when the feedback current is over 1.05mA. To decrease the standby consumption of the power supply , Chip-Rail introduces the Cycle Reset Mode technology；If the feedback current were over 1.1mA, mode controller of H6849 would reset internal register all the time and cut off the gate pin, while the output voltage is lower than the set value, it would set register, gate pin operating again. Although the frequency of the internal OSC is invariable, the register would reset some pulses so that the practical frequency is decreased at the gate pin. 5800 (kHz ) RI ( KΩ) For example, a 100kΩ resistor RI could H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 8/13 transformer. The energy E = 1 2 × L × I MAX 2 deposited by the transformer. So adjusting the RSENSE can set the Max output power of the power supple mode. The current flowing by the power MOSFET has an extra value ΔI = H6849 Green-Power Function Internal Synchronized Compensation Slop Although there are more advantages of the current mode control than conventional voltage mode control, there are still several drawbacks of peak-sensing current-mode converter. Especially the open loop instability when it operates in higher than 50% of the duty-cycle. H6849 is introduced an internal slope compensation adding voltage ramp to the current sense input voltage for PWM generation to solve this problem. It improves the close loop stability greatly at CCM, prevents the sub-harmonic oscillation and thus reduces the output ripple voltage. VSLOP = 0.33 × DUTY = 0.4389 × DUTY DUTYMAX Current Sensing & Dynamic peak limiting The current flowing by the power MOSFET comes in to being a voltage VSENSE on the sense pin cycle by cycle, which compares to the internal reference voltage, controls the reverse of the internal register, limits the peak current IMAX of the primary of the H6849P, H6849S,H6849NF VIN × TD due to the system delay T LP that the current detected from the sense pin to power MOSFET cut off in the H6849 (Among these, VIN is the primary winding voltage of the transformer and LP is the primary wind inductance. V IN ranges from 85VAC to 264VAC. To guarantee the output power is a constant for universal input AC voltage, there is a dynamic peak limit circuit to compensate the system delay T that the system delay brings on. Leading-edge Blanking (LEB) Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense pin, which would disturb the internal signal from the sampling of the RSENSE. There is a 300n sec leading edge blanking time built in to avoid the effect of the turn-on spike and the power MOSFET cannot be switched off during this time. So that the conventional external RC filtering on sense input is no longer required. H6849 Over Voltage Protection (OVP) There is a 26.7V over-voltage protection circuit in the H6849 to improve the credibility and extend the life of the chip. The GATE is to shutdown immediately when the voltage HSMC Product Specification HI-SINCERITY Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 9/13 MICROELECTRONICS CORP. of the VDD is over 26.7V and the voltage of VDD is to descend rapidly. current when the output is drove. The NMOS is shut off when the other NMOS is turned on. The clamp technology is introduced to protect the periphery power MOSFET from breaking down. Gate Driver & Soft Clamped H6849’ output designs a totem pole to drive a periphery power MOSFET. The dead time is introduced to minimize the transfixion PACKAGE DEMENSIONS DIP-8L Dimensions Symbol Millimeters Min. Typ. A Inches Max. Min. Typ. 5.334 A1 0.381 A2 3.175 0.210 0.015 3.302 3.429 0.125 0.130 b 1.524 0.060 b1 0.457 0.018 D 9.017 E E1 9.271 10.160 0.355 7.620 6.223 6.350 L 2.921 eB θ˚ 0.365 0.135 0.400 0.300 6.477 0.245 0.250 3.302 3.810 0.115 0.130 0.150 8.509 9.017 9.525 0.335 0.355 0.375 0˚ 7˚ 15˚ 0˚ 7˚ 15˚ e H6849P, H6849S,H6849NF Max. 2.540 0.255 0.100 HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 10/13 SOT-23-6L Symbol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 0.700 1.000 0.028 0.039 A1 0.000 0.100 0.000 0.004 B 1.397 1.803 0.055 0.071 b 0.300 0.559 0.012 0.022 C 2.591 3.000 0.102 0.118 D 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024 H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 11/13 MICROELECTRONICS CORP. SOP-8L Dimensions DISCLAIMERS Symbol Min. Millimeter Typ. Max. Min. Inch Typ. Max. A 1.346 1.752 0.053 0.069 A1 0.101 0.254 0.004 0.010 b 0.406 c 0.016 0.203 D 4.648 E 3.810 e 1.016 F 0.008 4.978 1.270 0.381X45 ° 0.183 3.987 0.150 1.524 0.040 0.196 0.157 0.050 0.015X45 ° 0.060 H 5.791 6.197 0.228 0.244 L 0.406 1.270 0.016 0.050 θ˚ 0° 8° 0° 8° H6849P, H6849S,H6849NF HSMC Product Specification HI-SINCERITY Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 12/13 MICROELECTRONICS CORP. Typical applications 12V/2A 24W Power Supply Schematic: Bill of Material: Designator Part Type R1,R2 1.2M ±5% R3,R4 750K ±5% R5,R6 180K ±5% R7 10R ±5% R8 47R ±5% R9 220R ±5% R10 10K ±5% R11 100K ±5% R12,R13,R14 2.2R ±5% R15 33R ±5% R16,R17 62R±5% R18 1.8K±5% R19 240R±5% R20 3.9K±1% R21 1K±1% R22 56K±5% R23 4.7K±5% C1 47uF/400V C2 222/1KV C3 101/50V C4 10uF/50V C5 104/50V C6 223/50V C7 102/500V C8,C9 680UF/16V C10,C11 104/50V H6849P, H6849S,H6849NF Footprint 12V-2A-BOM SMD 1206 SMD 1206 SMD 1206 SMD 1206 SMD 0805 SMD 0805 SMD O8O5 SMD O8O5 SMD 1206 SMD 1206 SMD 1206 SMD 1206 SMD 0805 SMD 0805 SMD 0805 SMD 0805 SMD 0805 EC CC SMD 0805 EC 6X11mm SMD 0805 SMD 0805 CC EC SMD 0805 Number 2 2 2 1 1 1 1 1 3 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 HSMC Product Specification HI-SINCERITY Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : 2009.07.14 Page No. : 13/13 MICROELECTRONICS CORP. U1 U2 U3 CX1 CY1 F1 NTC1 MOV L1 L2 L3 Q1 T1 BD1 D1 D2 D3 D4 ZD1 H6849 PC817C H431 0.22UF/275V 222/400V 2A250V 5D-9 7D471 UU9.8 T9*5*3 T3*15 H4N60 EF25 KBL206 FR107 FR104 1N4148 MBR10100 15V 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 PWM IC SOT-23-6 DIP-4 TO-92 1% KC X Y ∮3mm*11MM NTC PIN:6mm MOV PIN:5mm Min:18MH 0.2mm T16*9*7 L 8UH 15UH 4A600V TO-220 T LP=1.5MH ±3% 2A/600V DO-41 DO-41 SMD 10A100V TO-220 ZD 1W Transformer Structure and Material： 1. Schematic. B+ Drain Bais GND Vo N1 N2 N3 SGND 2. Winding Configuration 0.05×2T 0.05×2T 0.05×2T 0.05×2T 0.05×2T N3 (Bias GND) N2 (Vo SGND) E2 (Cu line GND) N1 (Drain B+) E1 (GND No) Bottom Bobbin: L H6849P, H6849S,H6849NF D=0.3mm×1P 14TS D=0.4mm×2P 12TS D=15mm×1P1.1TS D=0.3mm×1P 80TS D=0.2mm×1P Top CORE:EF25 TDK PC40 HSMC Product Specification