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| 型号： | CS5361GD16 |
| 厂商： | ON SEMICONDUCTOR |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A BATTERY CHARGE CONTROLLER, 635 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOIC-16 |
| 文件页数： | 3/15页 |
| 文件大小： | 120K |
| 代理商： | CS5361GD16 |
CS5361
http://onsemi.com
1241
VCC
Constant Current
Constant Voltage
Shutoff
Bias Mode
VREF
Battery
Voltage
Battery
Current
Inductor
Current
GATE(H)
GATE(L)
ENABLE/
UVLO
OSC
2.5 V
δ
VCOMP
ICOMP
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
DIL
(52)
where VOUT is the output voltage; TS is the period of one
switching cycle;
IL 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 VOUT to
calculate the inductance. The peak inductor current is given
by:
IL,PEAK + IO )
DIL
2.0
(53)
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
DILTS
DVOUT
(54)
The capacitor ESR (Equivalent Series Resistance) of the
capacitor also needs to be small enough to meet the ripple
requirement.
ESRMAX +
DVOUT
DIL
(55)
If the ESR obtained from the above equation is smaller
than the ESR specified in the capacitor manufacturer’s data
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