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| 型号： | ADP1883ARMZ-1.0-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/40页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-MSOP |
| 标准包装： | 1 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 45% |
| 电源电压： | 2.75 V ~ 20 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 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 |
| 其它名称： | ADP1883ARMZ-1.0-R7DKR |
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ADP1882/ADP1883
Diode Conduction Loss
The ADP1882/ADP1883 employ anticross conduction circuitry
that prevents the upper-side and lower-side MOSFETs from
conducting current simultaneously. This overlap control is
beneficial, avoiding large current flow that may lead to
irreparable damage to the external components of the power
stage. However, this blanking period comes with the trade-off of
a diode conduction loss occurring immediately after the
MOSFETs change states and continuing well into idle mode.
The amount of loss through the body diode of the lower-side
MOSFET during the antioverlap state is given by the following
expression:
to achieve minimal loss and negligible electromagnetic
interference (EMI).
P DCR(LOSS) = DCR × I 2LOAD + Core Loss
INPUT CAPACITOR SELECTION
The goal in selecting an input capacitor is to reduce or minimize
input voltage ripple and to reduce the high frequency source
impedance, which is essential for achieving predictable loop
stability and transient performance.
The problem with using bulk capacitors, other than their
physical geometries, is their large equivalent series resistance
(ESR) and large equivalent series inductance (ESL). Aluminum
P BODY ( LOSS ) =
t BODY ( LOSS )
t SW
× I LOAD × V F × 2
electrolytic capacitors have such high ESR that they cause
undesired input voltage ripple magnitudes and are generally not
effective at high switching frequencies.
1MHz
300kHz
where:
t BODY(LOSS) is the body conduction time (refer to Figure 82 for
dead time periods).
t SW is the period per switching cycle.
V F is the forward drop of the body diode during conduction
(refer to the selected external MOSFET data sheet for more
information about the V F parameter).
80
+125°C
+25°C
72
–40°C
If bulk capacitors are to be used, it is recommended that multi-
layered ceramic capacitors (MLCC) be used in parallel, due to
their low ESR values. This dramatically reduces the input voltage
ripple amplitude as long as the MLCCs are mounted directly across
the drain of the upper-side MOSFET and the source terminal of
the lower-side MOSFET (see the Layout Considerations section).
Improper placement and mounting of these MLCCs may cancel
their effectiveness due to stray inductance and an increase in
trace impedance.
64
56
I CIN , RMS = I LOAD , MAX ×
V OUT × ( V IN ? V OUT )
V OUT
48
40
32
24
16
The maximum input voltage ripple and maximum input capacitor
rms current occur at the end of the duration of 1 ? D while the
upper-side MOSFET is in the off state. The input capacitor rms
current reaches its maximum at Time D. When calculating the
maximum input voltage ripple, account for the ESR of the input
capacitor as follows:
8
2.7
3.4
4.1
4.8
5.5
V MAX,RIPPLE = V RIPP + ( I LOAD,MAX × ESR )
V DD (V)
Figure 82. Body Diode Conduction Time vs. Low Voltage Input (V DD )
Inductor Loss
During normal conduction mode, further power loss is caused
by the conduction of current through the inductor windings,
which have dc resistance (DCR). Typically, larger sized inductors
have smaller DCR values.
where:
V RIPP is usually 1% of the minimum voltage input.
I LOAD,MAX is the maximum load current.
ESR is the equivalent series resistance rating of the input
capacitor used.
Inserting V MAX,RIPPLE into the charge balance equation to
calculate the minimum input capacitor requirement gives
The inductor core loss is a result of the eddy currents generated
within the core material. These eddy currents are induced by the
C IN,min =
I LOAD , MAX
V MAX , RIPPLE
×
D (1 ? D )
f SW
changing flux, which is produced by the current flowing through
or
the windings. The amount of inductor core loss depends on the
core material, the flux swing, the frequency, and the core volume.
Ferrite inductors have the lowest core losses, whereas powdered
C IN,min =
I LOAD , MAX
4 f SW V MAX , RIPPLE
iron inductors have higher core losses. It is recommended to use
where D = 50%.
shielded ferrite core material type inductors with the ADP1882/
ADP1883 for a high current, dc-to-dc switching application
Rev. 0 | Page 27 of 40
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