AE2359 データシートの表示（PDF） - BaiDu Micro electrons Co., Ltd
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AE2359 Datasheet PDF : 11 Pages
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BAIDU MICRO ELECTRONS CO., LTD.
1.2A, 24V, 1.4MHz Step-down Converter
AE2359
current limit is reduced to 70% of nominal current limit when the part is operating at 480kHz. This low
Fold-back frequency prevents runaway current.
Thermal Shutdown
The AE2359 has on-chip thermal protection that prevents damage to the IC when the die
temperature exceeds safe margins. It implements a thermal sensing to monitor the operating junction
temperature of the IC. Once the die temperature rises to approximately 140°C, the thermal protection
feature gets activated .The internal thermal sense circuitry turns the IC off thus preventing the power
switch from damage.
A hysteresis in the thermal sense circuit allows the device to cool down to approximately 120°C
before the IC is enabled again. This thermal hysteresis feature prevents undesirable oscillations of
the thermal protection circuit.
PC Board Layout
This is a high switching frequency converter. Hence attention must be paid to the switching currents
interference in the layout. Switching current from one power device to another can generate voltage
transients across the impedances of the interconnecting bond wires and circuit traces. These
interconnecting impedances should be minimized by using wide, short printed circuit traces. The
input capacitor needs to be as close as possible to the IN and GND pins. The external feedback
resistors should be placed next to the FB pin.
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