参数资料
型号: ADP1621ARMZ-R7
厂商: Analog Devices Inc
文件页数: 21/32页
文件大小: 0K
描述: IC REG CTRLR PWM CM 10-MSOP
标准包装: 1
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1.5MHz
占空比: 97%
电源电压: 2.9 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 标准包装
产品目录页面: 791 (CN2011-ZH PDF)
配用: ADP1621-EVALZ-ND - BOARD EVALUATION FOR ADP1621
其它名称: ADP1621ARMZ-R7DKR

Data Sheet
EFFICIENCY CONSIDERATIONS
ADP1621
The efficiency, η, of a dc/dc converter is given by
?
The power dissipation in the winding resistance of the
P OUT
? I
?
P L , W = ? LOAD ? × R W
η = × 100 % (38)
P IN
where P OUT is the output power, and P IN is the input power to the
power stage inductor.
? 1 ? D ?
2
(42)
converter. While switching regulators are ideally lossless converters
of power, the nonideal characteristics of regulator components
degrade the efficiency of the regulator.
?
The supply current to the ADP1621 IC, which includes the
quiescent current and the gate driver charging current. The
power dissipation due to gate charging loss is approximated by
= ? ? LOAD ? × D × R DSON × ( 1 + K ) ? +
? ( V OUT + V D ) × 1 ? D × ( t R + t F ) × f SW
? I
?
P CS = ? LOAD ? × D × R CS (40)
The primary sources of power dissipation in the regulator include
? The power dissipation in the external power MOSFET due
to conduction and switching losses.
P MOSFET = P C + P SW (39)
? ? I ? ?
? ? 1 ? D ? ?
? I LOAD ?
?
? ?
? ?
? 2 ?
? ?
? The power dissipation in the external current-sense
resistor if lossless current sensing is not used.
2
? 1 ? D ?
P G = V PIN × Q G × f SW (43)
where P G is the gate charging power loss, V PIN is the voltage at
the PIN pin, Q G is the MOSFET total gate charge, and f SW is
the converter switching frequency. Therefore, the total power
dissipation in the IC itself is given by
P IC = P G + ( V IN × I Q ) (44)
= ( V PIN × Q G × f SW ) + ( V IN × I Q )
where P IC is the total power dissipated in the IC, I Q is the
quiescent current, and V IN is the voltage at the IN pin.
The secondary sources of power dissipation in the regulator include
? The power dissipation in the ESR of the input and output
capacitors.
? Inductor core losses due to hysteresis and eddy currents.
?
The power dissipation in the external diode.
P DIODE = V D × I LOAD
(41)
Rev. B | Page 21 of 32
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