ZXSC400E6TA Diodes Inc, ZXSC400E6TA Datasheet - Page 9

• Manufacturer Part Number: ZXSC400E6TA
• Description: LED Drivers Reg Bst LED Drvr
• Manufacturer: Diodes Inc

Specifications of ZXSC400E6TA

• Operating Supply Voltage: 1.8 V to 8 V
• Maximum Power Dissipation: 450 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Layout considerations
Layout is critical for the circuit to function in the most
efficient manner in terms of electrical efficiency,
thermal considerations and noise.
For ‘step-up converters’ there are four main current
loops, the input loop, power-switch loop, rectifier loop
and output loop. The supply charging the input
capacitor forms the input loop. The power-switch loop
is defined when Q1 is ‘on’, current flows from the input
through the inductor, Q1, R
Q1 is ‘off’, the energy stored in the inductor is
transferred to the output capacitor and load via D1,
forming the rectifier loop. The output loop is formed by
the output capacitor supplying the load when Q1 is
switched back off.
ISSUE 1 - JANUARY 2003
SENSE
and to ground. When
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To optimise for best performance each of these loops
kept separate from each other and interconnected with
short, thick traces thus minimising parasitic
inductance, capacitance and resistance. Also the
R
trace length, between emitter lead of Q1 and ground,
again minimising stray parasitics.
SENSE
resistor should be connected, with minimum
ZXSC400