參數(shù)資料
型號(hào)： CS5361GD16
英文描述： Analog IC
中文描述： 模擬IC
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 116K
代理商： CS5361GD16
CS5361
http://onsemi.com
11
V
CC
Constant Current
Constant Voltage
Shutoff
Bias Mode
V
REF
Battery
Voltage
Battery
Current
Inductor
Current
GATE(H)
GATE(L)
ENABLE/
UVLO
OSC
2.5 V
2.5 V
2.5 V
δ
δ
V
COMP
I
COMP
0 A
2.0 A
16.8 V
4.2 V
Figure 4. Key Operation Waveforms
δ
: Nonoverlap Time
DESIGN GUIDELINES
1. Selection of the Output Inductor
The value of the output inductor can be calculated based
on the inductor ripple current requirement:
L
(1.0
D)
TSVOUT
IL
(1)
where V
OUT
is the output voltage; T
S
is the period of one
switching cycle;
I
L
is the peak–to–peak inductor ripple
current given by design specification; and D is the duty
cycle. Because both duty cycle and the output voltage
change during charging operation, the designer should
determine the maximum product of (1.0 – D) and V
OUT
to
calculate the inductance. The peak inductor current is given
by:
IL,PEAK
IO
IL
2.0
(2)
The peak current should not saturate the core of the
inductor.
2. Selection of Output Capacitor
Both the output voltage ripple and the inductor current
ripple determine the value of the output capacitance. The
required minimum is given by:
C
0.125
ILTS
VOUT
(3)
The capacitor ESR (Equivalent Series Resistance) of the
capacitor also needs to be small enough to meet the ripple
requirement.
ESRMAX
VOUT
IL
(4)
If the ESR obtained from the above equation is smaller
than the ESR specified in the capacitor manufacturer’s data
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