NCP1225 Product Preview Low Standby Power SMPS Controller NCP1225 is a low standby power Switch−Mode Power Supply, SMPS controller IC specially designed for low power AC−DC adapter applications. The device operates in Discontinuous Conduction Mode (DCM) with Pulse Frequency Modulation (PFM) control scheme. PFM operation can provide high operating efficiency even at light loading conditions and the device itself takes extremely low operating current. With careful circuit design, low standby power down to 300 mW can be achieved for universal line input low power adapters. This specific feature can help the end products to comply with immediate and future international power saving regulations easily. An innovative feedback compensation scheme is integrated in NCP1225 to eliminate the expensive optocoupler in the feedback path. By only using simple auxiliary winding feedback, the regulator still can achieve good output voltage regulation usually not possible with common SMPS controller ICs without optocoupler. For even better regulation applications, optocoupler feedback can still be used in place. Additionally, value−added features as overvoltage protection, undervoltage lockout and overcurrent protection functions are also included. This controller is an ideal solution for low power adapters and mobile phone chargers. With all valuable features, this device is available in the tiny TSOP−5 package. http://onsemi.com MARKING DIAGRAM 5 TSOP−5 SN SUFFIX CASE 483 5 1 TBDM 1 TBD = Device Code M = Date Code PIN CONNECTIONS VCC 1 GND 2 VDRIVE 3 5 GATE 4 CS (Top View) Features • • • • • • • • • • • Current Mode Operation Cycle−By−Cycle Current Limiting High Efficiency Pulse Frequency Modulation (PFM) Control Low Device Operating Current, 0.5 mA Typical No Optocoupler Feedback Control Extremely Low Standby Power Internal Leading Edge Blanking Input Undervoltage Lockout Protection Output Overvoltage Protection Optional Optocoupler Feedback Micro Miniature TSOP−5 Package ORDERING INFORMATION Device TBD Package Shipping TSOP−5 TBD Typical Applications • Low Power Wall Mount Adapters • Mobile Phone Adapter Chargers • TV/Computer Auxiliary Power Supply This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice. Semiconductor Components Industries, LLC, 2003 November, 2003 − Rev. P0 1 Publication Order Number: NCP1225/D NCP1225 − + VDRIVE + 0.125 V − + VCC − + − 7.5/12 V − + Reference S Q R Q OR + 1V − GATE AND TON MAX + 0.5 V + − − GND LEB Figure 1. Simple Block Diagram http://onsemi.com 2 CS NCP1225 PIN FUNCTION DESCRIPTION Pin Symbol Description 1 VCC This pin is the supply of the IC. When voltage at this pin is higher than 12 V typical, the operation will be activated. 2 GND This pin is the ground of the primary side of the system. 3 VDRIVE 4 CS 5 GATE This pin is also used to detect the current status of secondary winding. The Current Sense pin senses the voltage developed across the current sensing resistor in series with the power MOSFET. This information is used to terminate the output switch conduction cycle. Controller output to the gate of the power MOSFET. MAXIMUM RATINGS Rating Symbol Value Unit VCC −0.3 to 16 V Gate Output Current, Source Current (Note 1) IO_SRC 350 mA Gate Output Current, Sink Current (Note 1) IO_SINK 450 mA Thermal Characteristics TSOP−5 Plastic Package, Case 483 Thermal Resistance, Junction−to−Air RJA 250 °C/W Current Sense, CS Input Voltage VCS −0.3 to 10 V VDRIVE Input Voltage VDRIVE −0.3 to 10 V Gate Voltage Supply Voltage, VCC VGATE −0.3 to 16 V Operating Junction Temperature TJ −25 to +150 °C Operating Ambient Temperature TA −25 to +105 °C Storage Temperature Range Tstg −65 to 150 °C ESD Capability, HBM Model − 2.0 KV ESD Capability, Machine Model − 200 V 1. Maximum package power dissipation limits must be observed. http://onsemi.com 3 NCP1225 ELECTRICAL CHARACTERISTICS (For typical values VCC = 13 V, TA = 25°C, and for min/max values TA = −25°C to +105°C, unless otherwise noted.) Characteristic Symbol Min Typ Max Unit VCS_RESET 0.95 1.0 1.05 V VCS_SET 0.475 0.5 0.525 V IIB − TBD − A tPLH − 200 − ns VDRIVE_SET_TH 0.118 0.125 0.131 V IVDRIVE_IB − 50 − nA Output Voltage Rise Time (CL = 1.0 nF, TA = 25°C) tR − 55 − ns Output Voltage Fall Time (CL = 1.0 nF, TA = 25°C) tF − 40 − ns − − 0.27 1.5 − − CURRENT SENSE COMPARATOR (PIN 4) Current Sense Reset Threshold Current Sense Set Threshold Input Bias Current Propagation Delay (Current Sense Input to Output) VDRIVE (PIN 3) Vdrive Sense Pin Threshold Input Bias Current GATE (PIN 5) Output Voltage Low State (Isink = 20 mA) (Isink = 100 mA) VOL V High State (Isource = 20 mA) (Isource = 100 mA) VOH − − 11.7 10 − − V Gate Signal Maximum ON Time TON(MAX) 8.0 10 12 s Start−Up Threshold (VCC Rising) VTH(ON) 11 12 13 V Minimum Operation Voltage After Turn−On VCC(MIN) 6.5 7.5 8.5 V VTH(OVP) 13.5 14.5 15.5 V ISTART − − 60 A ICC − 0.5 − mA UNDERVOLTAGE LOCKOUT (PIN 1) OVERVOLTAGE PROTECTION (PIN 1) Overvoltage Protect (OVP) Threshold TOTAL DEVICE Power Supply Current Startup (VCC = 10 V) Operating Current (No Switch, TA = 25°C) http://onsemi.com 4 NCP1225 MUR1100 470 F 4.7 F 200 K 2 Meg 100 K 1N4007 47 n 90 264 Vac 4.7 F x 2 GND VDRIVE 1 5 NCP1225 VCC 2 3 4 GATE 1N60E CS 4.7 F 200 K 3 Figure 2. Typical Application Circuit Without Optocoupler http://onsemi.com 5 500 NCP1225 PACKAGE DIMENSIONS TSOP−5 SN SUFFIX CASE 483−02 ISSUE C NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. D S 5 4 1 2 3 B L G A J C 0.05 (0.002) H M K DIM A B C D G H J K L M S MILLIMETERS MIN MAX 2.90 3.10 1.30 1.70 0.90 1.10 0.25 0.50 0.85 1.05 0.013 0.100 0.10 0.26 0.20 0.60 1.25 1.55 0 10 2.50 3.00 INCHES MIN MAX 0.1142 0.1220 0.0512 0.0669 0.0354 0.0433 0.0098 0.0197 0.0335 0.0413 0.0005 0.0040 0.0040 0.0102 0.0079 0.0236 0.0493 0.0610 0 10 0.0985 0.1181 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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