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H6849 Datasheet(PDF) 1 Page - Hi-Sincerity Mocroelectronics |
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H6849 Datasheet(HTML) 1 Page - Hi-Sincerity Mocroelectronics |
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1 / 13 page  HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : IC200804 Issued Date : 2008.09.19 Revised Date : Page No. : 1/13 H6849P, H6849S,H6849NF HSMC Product Specification H6849 Series Novel Low Cost Green-Power PWM Controller Features 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 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 SOT-23-6L、SOP-8 & DIP-8 Pb-Free Packaging Compatible with SG5701 & SG5848 & LD7535 &OB2263/2263 Applications Switching AC/DC Adaptor Battery Charger Open Frame Switching Power Supply 384X Replacement 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 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. |
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