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IW1690 Dataheets PDF



Part Number IW1690
Manufacturers iWatt
Logo iWatt
Description Low-Power Off-line Digital PWM Controller
Datasheet IW1690 DatasheetIW1690 Datasheet (PDF)

Not Recommended For New Designs iW1690 Low-Power Off-line Digital PWM Controller 1.0 Features • Primary-side feedback eliminates opto-isolators and simplifies design • Direct drive of BJT switching device • Multi-mode operation for highest overall efficiency • Built-in cable drop compensation • Very tight output voltage regulation • No external compensation components required • Complies with CEC/EPA no load power consumption and average efficiency regulations • Built-in output constan.

  IW1690   IW1690


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Not Recommended For New Designs iW1690 Low-Power Off-line Digital PWM Controller 1.0 Features • Primary-side feedback eliminates opto-isolators and simplifies design • Direct drive of BJT switching device • Multi-mode operation for highest overall efficiency • Built-in cable drop compensation • Very tight output voltage regulation • No external compensation components required • Complies with CEC/EPA no load power consumption and average efficiency regulations • Built-in output constant-current control with primary-side feedback • Low start-up current (10 µA typical) • Built-in soft start • Built-in short circuit protection and output overvoltage protection • Optional AC line under/overvoltage protection • Fixed switching frequency: 45 kHz, 65 kHz or 75 kHz • Dynamic base current control • PFM operation at light load • Built-in current sense resistor short protection 2.0 Description The iW1690 is a high performance AC/DC power supply controller which uses digital control technology to build peak current mode PWM flyback power supplies. The device directly drives a BJT switching device and provides high efficiency along with a number of key built-in protection features while minimizing the external component count, simplifying EMI design and lowering the total bill of material cost. The iW1690 removes the need for secondary feedback circuitry while achieving excellent line and load regulation. It also eliminates the need for loop compensation components while maintaining stability over all operating conditions. Pulse-by-pulse waveform analysis allows for a loop response that is much faster than traditional solutions, resulting in improved dynamic load response. The built-in power limit function enables optimized transformer design in universal off-line applications and allows for a wide input voltage range. The ultra-low start-up power and operating current at light load ensure that the iW1690 is ideal for applications targeting the newest regulatory standards for average efficiency and standby power. 3.0 Applications • Low power AC/DC adapter/chargers for cell phones, PDAs, digital still cameras • Low power AC/DC adapter/chargers to replace RCC implementations L N + + VOUT GND 1 VSENSE VCC 8 2 VIN OUTPUT 7 3 RIN 4 IBC ISENSE 6 GND 5 U1 iW1690 Figure 2.0.1 iW1690 Typical Application Circuit Rev. 1.8 iW1690 February 3, 2012 Page 1 Not Recommended For New Designs iW1690 Low-Power Off-line Digital PWM Controller 4.0 Pinout Description iW1690 1 VSENSE VCC 8 2 VIN OUTPUT 7 3 RIN ISENSE 6 4 IBC GND 5 Pin # 1 2 3 4 5 6 7 8 Name VSENSE VIN RIN IBC GND ISENSE OUTPUT VCC Type Pin Description Analog Input Auxiliary voltage sense (used for primary regulation and ZVS). Analog Input Rectified AC line voltage sense. Analog Input Sense line input voltage. Analog Input Adjust maximum base current. Ground Ground. Analog Input Primary current sense. Used for cycle-by-cycle peak current control and limit. Output Base drive for BJT. Power Input Power supply for control logic and voltage sense for power-on reset circuitry. Rev. 1.8 iW1690 February 3, 2012 Page 2 Not Recommended For New Designs iW1690 Low-Power Off-line Digital PWM Controller 5.0 Absolute Maximum Ratings Absolute maximum ratings are the parameteic values or ranges which can cause permanent damage if exceeded. For maximum safe operating conditions, refer to Electrical Characteristics in Section 6.0. Parameter DC supply voltage range (pin 8, ICC = 20mA max) Continuous DC supply current at VCC pin Peak DC supply current at VCC pin Low voltage output (pin 7) VSENSE input (pin 1) VIN input (pin 2) Low voltage analog input (pins 3, 4 and 6) Power dissipation at TA ≤ 25°C Maximum junction temperature Storage temperature Lead temperature during IR reflow for ≤ 15 seconds Thermal Resistance Junction-to-Ambient ESD rating per JEDEC JESD22-A114 (HBM) Latch-Up test per JEDEC 78 Symbol VCC ICC ICCPK PD TJ MAX TSTG TLEAD θJA Value -0.3 to 18 20 120 -0.3 to 4.0 -0.6 to 4.0 -0.3 to 18.0 -0.3 to 4.0 526 125 –65 to 150 260 160 2,000 ±100 Units V mA mA V V V V mW °C °C °C °C/W V mA 6.0 Electrical Characteristics VCC = 12 V, -40°C ≤ TA ≤ 85°C, unless otherwise specified (Note 1) Parameter Symbol Test Conditions VIN SECTION (Pin 2) Start-up voltage low threshold Start-up voltage high threshold Start-up current Shutdown low voltage threshold Shutdown high voltage threshold VSENSE SECTION (Pin 1) Input leakage current Nominal voltage threshold Output OVP threshold VINST(LO) VINST(HI) IIN(ST) VUVDC VOVDC TA= 25°C, positive edge TA= 25°C, positive edge VCC = 10 V TA= 25°C, negative edge TA= 25°C, positive edge IVSENSE VSENSE(NOM) VSENSE(MAX) VSENSE = 2 V TA=25°C, negative edge TA=25°C, negative edge Rev. 1.8 iW1690 February 3, 2012 Min 332 1.755 203 1.791 1.522 1.667 Typ 370 1.950 8 225 1.990 1.538 1.700 Max 407 2.145 15 248 2.189 1 1.553 1.734 Unit mV V µA mV V μA V V Page 3 Not Recommen.


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