Panasonic AN8037 free download

File name AN8037.pdf

Voltage Regulators AN8027, AN8037 AC-DC switching power supply control IC with standby mode s Overview The AN8027 and AN8037 are ICs developed for selfexcited switching regulator of RCC local resonance control type. These ICs are designed to achieve stability and high efficiency over a wide input voltage range and loads range (light loads to heavy loads), for supporting input levels used worldwide and improved conformance with energy conservation laws. 2.4±0.25 6.0±0.3 3.3±0.25 Unit: mm 8 0.5±0.1 7 23.3±0.3 6 5 4 1.5±0.25 1.5±0.25 1.4±0.3 s Features · Support improved conformance with energy conservation laws by providing two operating modes. 0.3 +0.1 ­0.05 · Standby mode (light loads): 3.0±0.3 Achieves better efficiency due to reduced frequency . · Normal mode: SIP009-P-0000C Achieves high efficiency in RCC local resonance operation with zero-cross detection. · Incorporating an input voltage compensation function available to a wide input range for worldwide use. · This function compensates the maximum on-period in inverse proportion to the input voltage. · Incorporating a timer latch function. · The time period can be adjusted according to the overload in normal mode or standby mode. · This function makes it possible to protect the IC from damage that may be caused by the short-circuiting of the IC's external capacitor for the timer. · Incorporating an overvoltage protection function. (detects at VCC pin) · Incorporating a pulse-by-pulse overcurrent protection function, which makes latch protection possible at the time of the short-circuiting of the transformer's primary winding. · Adopting a 9-pin single inline package (E-9S: available to manufacturing in overseas). · AN8027: Transformer resetting is detected from the high- or low-level signal on the TR pin. · AN8037: Transformer resetting is detected from the falling edge of the high-level signal on the TR pin. Refer to the "[1] operation descriptions 7. local resonance operation" section in the application notes. 2 1 s Applications · Televisions, VCRs, facsimiles, and printers 30° 3 2.54 9 1 AN8027, AN8037 s Block Diagram 7 V CC Voltage Regulators OVP SD 8 Timer 3.8 V S R (SD latch) Q INIT Start Stop VREF 7.1 V 0.5 V Current reviser (IFB) High-side clamp Q Q Q Q Q In In OCP 2 Out Drive 6 Out 5 GND Q FB 9 I/V conv. (0.7 V) VFB TON TOFF CF latch Q S R R - 0.2 V 4 TR 1 High-side clamp Low-side clamp (- 0.15 V) Current reviser (ITR) 0.35 V CLM 1.0 V One shot Start pulse To timer s Absolute Maximum Ratings Parameter Supply voltage Constant output current Peak output current TR pin allowable application current OCP pin allowable application voltage CLM pin allowable application voltage SD pin allowable application voltage FB pin allowable application current Power dissipation (Ta 25°C) Power dissipation (Ta = 85°C) Operating ambient temperature Storage temperature * * Symbol VCC IOUT IOP ITR VOCP VCLM VSD IFB PD CF 3 Rating 24 ±150 ±1 000 ±5 - 0.3 to