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R7731A Datasheet(PDF) 5 Page - Richtek Technology Corporation |
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R7731A Datasheet(HTML) 5 Page - Richtek Technology Corporation |
5 / 14 page R7731A 5 R7731A-10 August 2011 www.richtek.com Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θJA is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. Guaranteed by design. Parameter Symbol Test Conditions Min Typ Max Unit Frequency Jittering Range -- ±6 -- % PWM Frequency Jitter Period TJIT For 65 kHz -- 4 -- ms Maximum Duty Cycle DMAX 70 75 80 % Frequency Variation Versus VDD Deviation fDV VDD = 12V to 25V -- -- 2 % Frequency Variation Versus Temperature Deviation fDT TA = −30°C to 105°C (Note 5) -- -- 5 % COMP Input Section Open Loop Voltage VCOMP_OP COMP pin open 5.2 5.6 6 V COMP Open-loop Protection Delay Cycles TOLP RT = 100kΩ -- 60 -- ms Short Circuit Current IZERO VCOMP = 0V -- 1.2 2.2 mA Current-Sense Section Initial Peak Current Limit Offset VCSTH 0.8 0.85 0.9 V Leading Edge Blanking Time TLEB -- 420 520 ns Propagation Delay Time TPD -- 100 -- ns GATE Section Rising Time TR VDD = 15V, CL = 1nF -- 250 350 ns Falling Time TF VDD = 15V, CL = 1nF -- 150 250 ns Gate Output Clamping Voltage VCLAMP VDD = 22V -- 12 -- V Over Temperature Protection TOTP 140 -- -- °C OTP Hysteresis TOTP_HYS -- 30 -- °C |
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