AP3101 BCDSEMI | Alldatasheet

Document overview

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Technical content

Features

  • Green Current Mode PWM Controller
  • Adjustable Skip Level
  • Leading Edge Blanking (LEB)
  • Cycle by Cycle Current Limit
  • Built-in Short Circuit Protection
  • Built-in Synchronized Slope Compensation
  • Low Start-up/Operating Current: 30µA/3mA
  • Adjustable Oscillator Frequency
  • Totem Pole Output Including Soft Driving
  • Under-V oltage Lockout (UVLO)
  • Accurate Over-Temperature Protection with Hys- teresis

Applications

  • Off-line AC-DC Adapter
  • Battery Charger Applications

Figure 1. Package Types of AP3101

Figure 2. Pin Configuration of AP3101 (Top View)

1 GND Power ground

2 FB Feedback

3 VIN Start-up current in

4 RI Reference setting

5 ADJ Adjust the level of skip cycle

6 SENSE Current sense

7 VCC The positive supply of the control IC

8 GATE Driver output

Figure 3. Functional Block Diagram of AP3101

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.

Ordering Information

Range Part Number Marking ID Packing Type DIP-8 -40 to 85oC AP3101P-E1 AP3101P-E1 Tube SOIC-8 -40 to 85oC AP3101M-E1 3101M-E1 Tube AP3101MTR-E1 3101M-E1 Tape & Reel Circuit Type Package P: DIP-8 E1: Lead Free AP3101 - TR: Tape and Reel Blank: Tube M: SOIC-8

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Parameter Symbol Value Unit Supply V oltage V CC 30 V Gate Output Current I O 600 mA Input V oltage to FB -0.3 to 7 V Input V oltage to SENSE -0.3 to 7 V Input V oltage to RI -0.3 to 7 V Input V oltage to ADJ -0.3 to 7 V Operating Junction Temperature 150 oC Storage Temperature Range T STG -65 to 150 oC ESD (Human Body Model) 4 kV ESD (Machine Model) 400 V Power Dissipation at T A<25oC PD 1350 mW Thermal Resistance (Junction to Ambient) RθJA oC/W Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indi- cated under "Recommended Operating Conditi ons" is not implied. Exposure to "A bsolute Maximum Ratings" for extended periods may affect device reliability. Absolute Maximum Ratings (Note 1) Parameter Symbol Min Max Unit Operating Ambient Temperature TA -40 85 oC Supply V oltage VCC 20 V Recommended Operating Conditions

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Parameter Symbol Condi tions Min Typ Max Unit UNDER-VOLTAGE LOCKOUT SECTION Start-up V oltage V THON 15 16 17 V Minimum Operating V oltage V THOFF 91 0 1 1 V TOTAL STANDBY CURRENT SECTION Start-up Current V CC=14.8V 30 45 µA Operating Current I CC VFB=VSENSE=0V , CL=1nF 3 4 mA PWM SECTION Maximum Duty Cycle D MAX 70 80 90 % Minimum Duty Cycle D MIN 0% OSCILLATOR SECTION Oscillation Frequency f OSC RI=26kΩ 60 65 70 kHz Frequency Change with V oltage V CC=10 to 20V 2 % Temperature Stability TA=-40 oC to 85 oC 5% FEEDBACK INPUT SECTION The Ratio of Input V oltage to Current Sense V oltage 2 . 533 . 5V / V Input Impedance 3 4.5 6 k Ω Source Current -2 mA Input V oltage for Zero Duty 1.2 V CURRENT SENSE SECTION Threshold V oltage V TH 0.8 0.85 0.9 V Delay to Output 150 200 ns The Delay Time of Short Circuit Protection RI=26kΩ 23 ms OUTPUT SECTION Low Level V oltage V OL IO=200mA, VCC=12V 1.5 V High Level V oltage V OH IO=50mA, VCC=12V 8 V Rise Time t R VCC=13V , CL=1nF 150 250 350 ns Fall Time t F VCC=13V , CL=1nF 30 50 90 ns (VCC=15V , TA=25oC, unless otherwise specified.)

Electrical Characteristics

Figure 4. Oscillator Frequency vs. Ambient Temperature Figure 5. Start-up Current vs. Ambient Temperature

Figure 10. Skip Level vs. Ambient Temperature Fig ure 11. Oscillator Frequency vs. Timing Resistor hold-up capacitor value and the power loss in AP3101.

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Operation Description (Continued) in series with the source of the MOSFET. The peak inductor current under normal operating conditions is controlled by the voltage at FB pin: Abnormal operating conditions occur when the power supply output is overloaded or the output voltage sens- ing is lost. Under these conditions, the current sense comparator threshold will be internally clamped to 0.85V . Therefore the maximum peak switch current is: Leading Edge Blanking A narrow spike on the leading edge of the current waveform can usually be observed when the power MOSFET is turned on. A 270 ns leading-edge blank is built-in to prevent the false-triggering caused by the turn-on spike; so the RC fi lter on the current sense input can be removed. During this period, the current limit comparator is disabled and the gate driver can not be switched off. Built-in Slope Compensation It is well known that a continuous current mode SMPS may become unstable when the duty cycle exceeds 50%. The built-in slope compensation can improve the stability, so th ere is no need for design engineer to spend much time on that. Short Circuit Protection Built-in short circuit protection can protect a SMPS from being damaged when short circuit of output or over load conditions happen. The feedback voltage will keep its value above its upper limit of 4.2V as long as short circuit exists, and then gate driver will be turned off after fixed delay time of 23 ms. When V CC of AP3101 dropped under the minimum operating voltage, the device will be turned off and the system will try to restart. The SMPS will not recover its normal operation until the short circuit or over load is removed. Green Mode Operation ADJ pin is the non-inverting input of skip cycle comparator. The voltage at FB pin minus 0.9V is compared with the voltage at ADJ pin. If the voltage at ADJ pin is larger, AP3101 will start to blank its output pulse. In normal operation, AP3101 works at fixed switching frequency, and V FB is in high level. When load power becomes lighter, the V FB will decrease. When VFB drops to the threshold, AP3101 will enter the skip cycle mode and op erate intermittently. The threshold is adjustable by changing the value of the resistor connected from pin ADJ to the ground. SFBpk RVI 3/)9.0( −= SPK RI /85.0(max) =

Figure 12. Typical Application of AP3101

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Mechanical Dimensions Unit: mm(inch)SOIC-8 R0.150(0.006) R0.150(0.006) 1.000(0.039) 0.330(0.013) 0.510(0.020) 1.350(0.053) 1.750(0.069) 0.100(0.004) 0.300(0.012) 0.900(0.035) 0.800(0.031) 0.200(0.008) 3.800(0.150) 4.000(0.157) 20:1 D 1.270(0.050) TYP 0.190(0.007) 0.250(0.010) D 5.800(0.228) 6.200(0.244) 0.675(0.027) 0.725(0.029) 0.320(0.013) 0.450(0.017) 0.800(0.031) 4.700(0.185) 5.100(0.201) φ

GREEN MODE PWM CONTROLLER AP3101 Preliminary Datasheet Apr. 2007 Rev. 1. 3 BCD Semiconductor Manufacturing Limited Mechanical Dimensions (Continued) DIP-8 Unit: mm(inch) R0.750(0.030) 0.254(0.010)TYP 0.130(0.005)MIN 8.200(0.323) 9.400(0.370) 0.204(0.008) 0.360(0.014) 7.620(0.300)TYP 0.700(0.028) 9.000(0.354) 9.400(0.370) 3.710(0.146) 4.310(0.170) 3.000(0.118) 3.600(0.142) 0.360(0.014) 0.560(0.022) 6.600(0.260) 3.200(0.126) 3.600(0.142) 0.510(0.020)MIN Φ3.000(0.118) Depth 0.100(0.004) 0.200(0.008) 1.524(0.060) TYP

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