IC SMD Type Current Mode PWM Controller OB2263 ( SOT-23-6 ) Unit: mm +0.1 6 5 4 1 2 3 ● External Programmable PWM Switching Frequency ● Internal Synchronized Slope Compensation ● Low VDD Startup Current and Low Operating Current (1.4mA) ● Leading Edge Blanking on Current Sense Input 0.55 +0.2 1.6 -0.1 ● Audio Noise Free Operation +0.02 0.15 -0.02 +0.01 -0.01 +0.2 -0.1 +0.1 1.1 -0.1 ● Good Protection Coverage With Auto Self-Recovery 0-0.1 +0.1 0.68 -0.1 ● Gate Output Maximum Voltage Clamp (13V) ● Overload Protection (OLP) +0.2 2.8 -0.1 ■ Features 0.4 0.4 -0.1 1.GND 2.FB 3.NC 4.SENSE 5.VDD 6.GATE ■ Block Diagram www.kexin.com.cn 1 IC SMD Type Current Mode PWM Controller OB2263 ■ Typical Applicattion OB2263 ■ Terminal Assignments Pin Name I/O GND P FB I Description Ground Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and SENSE pin input. NC SENSE I Current sense input pin. Connected to MOSFET current sensing resistor node. VDD P Chip DC power supply pin. GATE O Totem-pole gate drive output for the power MOSFET. ■ Absolute Maximum Ratings Ta = 25℃ Parameter Symbol Rating DC supply voltage VDD 10 to 30 VDD Zener Clamp Voltage FB VCC VDD_Clamp+0.1V VFB Input Voltage VFB -0.3 to 7 VSENSE -0.3 to 7 ICC 10 mA RθJA 200 ℃/W Junction Temperature TJ -20 to 150 Operating temperature TOPT -20 to 85 Storage Temperature Range Tstg -55 to 160 VSENSE Input Voltage to Sense Pin VCC DC clamp current Thermal Resistance Junction to Ambient 2 www.kexin.com.cn Unit V ℃ IC SMD Type Current Mode PWM Controller OB2263 ■ Electrical Characteristics Ta = 25℃ Min Typ Max Turn on threshold Voltage Parameter UVLO_ON Symbol Test Conditions 7.5 8.5 9.5 Turn-off threshold Voltage UVLO_OFF 13.5 14.5 15.5 Start up current I_VCC_ST VDD =12.5V Operation Current I_VCC_OP VDD=16V, VFB=3V 1.4 VCC Zener Clamp VCC_Clamp IVCC= 5 mA 34 VFB_Open ΔVFB /ΔVcs 4.8 VFB Open Loop Voltage PWM input gain ΔVfb/ΔVcs FB Pin Short Current 20 Avcs IFB_Short FB Shorted to GND Unit V uA mA V 2 V/V 0.4 mA Zero Duty Cycle FB Threshold Voltage VTH_0D Power limiting FB Threshold VTH_PL 3.7 Power limiting Debounce TD_PL 47 mS Input Impedance VDD =16V 0.75 ZFB_IN Maximum duty cycle Leading edge Blanking Time Input impedance Max_Duty VDD=18V, FB=3V, CS=0 TLEB ZCS OCP control delay TD_OC GATE with 1nF to GND OCP threshold VTH_OC FB=3.3V 0.75 6 kΩ 75 % 330 nS 40 kΩ 120 nS 0.8 Normal Oscillation Frequency Fosc Burst Mode Base Frequency Fosc_BM VDD = 16V 60 22 Frequency variation versus temp. Deviation Δf_temp VDD=16V,Ta = -20 to 85℃ 5 Frequency variation versus VCC Δf_VCC VCC = 12 to 25V 5 Frequency Jittering Δf_OSC Shuffling Frequency F_shuffling VOL VCC = 16V, Io = -20mA Output High Level VOH VDD = 16V, Io = 20 mA Output clamp voltage 0.85 70 -3 Output voltage Low V KHz % 3 65 Vclamp V Hz 0.8 V 10 13 Rising time Tr VDD = 16V, CL = 1nf 200 Falling time Tf VDD = 16V, CL = 1nf 70 ns ■ Marking Marking 63** www.kexin.com.cn 3 IC SMD Type Current Mode PWM Controller OB2263 ■ Typical Characterisitics . 4 www.kexin.com.cn