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S-85S1AB19-I6T1U Datasheet(PDF) 10 Page - Seiko Instruments Inc |
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S-85S1AB19-I6T1U Datasheet(HTML) 10 Page - Seiko Instruments Inc |
10 / 30 page 5.5 V INPUT, 200 mA SYNCHRONOUS STEP-DOWN SWITCHING REGULATOR WITH 260 nA QUIESCENT CURRENT S-85S1A Series Rev.1.2_00 10 8. Automatic recovery type short-circuit protection function (Hiccup control) The S-85S1A Series has a built-in automatic recovery type short-circuit protection function for Hiccup control. Hiccup control is a method for periodically carrying out automatic recovery when the IC detects overcurrent and stops the switching operation. 8. 1 When over load status is released <1> Overcurrent detection <2> Under voltage protection circuit (UVP circuit) detects a drop in the output voltage (VOUT). <3> 220 μs elapse <4> Switching operation stop (for 9 ms typ.) <5> Overload status release <6> The IC restarts, soft-start function starts. In this case, it is unnecessary to input an external reset signal for restart. <7> VOUT reaches VOUT(S) after 1.0 ms typ. elapses. <1> <5> <2> <4> <6> <3> <7> VSW VOUT IL *1 220 s 9.0 ms typ. 1.0 ms typ. ILIMDET = 270 mA typ. IOUT = 200 mA max. 0 A 0 V 0 V VOUT(S) VUVP typ. Overload status Normal load status *1. Inductor current Figure 4 8. 2 When over load status continues <1> Overcurrent detection <2> The UVP circuit detects a drop in VOUT. <3> 220 μs elapse <4> Switching operation stop (for 9 ms typ.) <5> The IC restarts, soft-start function starts. <6> The status returns to <2> when over load status continues after 1.25 ms typ. elapses. <1> <2> <4> <5> <2> <4> <3> <3> <6> VSW VOUT IL *1 220 s 220 s 9.0 ms typ. 9.0 ms typ. 1.25 ms typ. ILIMDET = 270 mA typ. IOUT = 200 mA max. 0 A 0 V 0 V VOUT(S) VUVP typ. Overload status *1. Inductor current Figure 5 |
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