ZXSC100X8 查看數據表（PDF） - Diodes Incorporated.

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ZXSC100X8

SINGLE CELL DC-DC CONVERTER SOLUTION

Diodes Incorporated. 

ZXSC100

Designing with the ZXSC100

Introduction

This section refers to the ZXSC100, 3.3V/100mA

output reference design and demonstrates the

dynamic performance of the solution.

VBATT

L1

22µH

R1

0R

C1

220µF

U1

EM

VDRIVE

BAS

ISENSE

RE

FB

VCC

ZXSC100

GND

D1

ZHCS1000

3.3V/0.1A

Q1

FMMT617

R3 C3

110K 1NF

C2

220µF

R2

R4

0.033R

30K

Main switching waveforms

Steady state operation under constant load gives an

excellent indication of ZXSC100 performance.

Represented in Figure 3. is the main switching

waveform, measured at the collector of Q1, indicating

the transistor on-state and the diode energy transfer to

the output.

Figure 1.

ZXSC100 low power solution, 3.3V/100mA output.

Efficiency

Efficiency is often quoted as one of the key parameters

of a DC-DC converter. Not only does it give an

instantaneous idea of heat dissipation, but also an

idea as to the extent battery life can be extended.

Figure 2. Shows the efficiency of the ZXSC100 low

power solution. Efficiency v Output current is shown

for a 3.3V output at various input voltages.

Figure 3.

Switching waveform

The peak switching current is derived from the

threshold of the ISENSE pin and the sense resistor value

(see Applications section for calculations). Figure 4.

shows the switching waveform associated with the

ISENSE pin

VBATT

L1

22µH

R1

0R

C1

220µF

U1

EM

VDRIVE

BAS

ISENSE

RE

FB

VCC

ZXSC100

GND

D1

ZHCS1000

3.3V/0.1A

Q1

FMMT617

R3 C3

110K 1NF

C2

220µF

R2

R4

0.033R

30K

Figure 2.

ZXSC100 efficiency v output current

SEMICONDUCTORS

Figure 4.

ISENSE threshold

14

ISSUE 3 - JANUARY 2004

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