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參數(shù)資料
| 型號(hào)： | MAX1800 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Digital Camera Step-Up Power Supply |
| 中文描述： | 數(shù)碼相機(jī)升壓型電源 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 461K |
| 代理商： | MAX1800 |
M
Digital Camera Step-Up
Power Supply
18
______________________________________________________________________________________
4) Place the compensation zero at the same frequency
as the maximum output pole frequency (in Hz):
Solving for C
C
:
Use values of C
C
less than 10nF. If the above calcula-
tion determines that the capacitor should be greater
than 10nF, use C
C
= 10nF, skip step 4 , and proceed to
step 5.
4) Determine the crossover frequency (in Hz):
To maintain at least a 10dB gain margin, make sure
that the crossover frequency is less than or equal to
1/3 of the output capacitor ESR zero frequency, or:
3f
C
≤
Z
O
or:
D
6 V
ERF
If this is not the case, go to step 5 to reduce the error
amplifier high-frequency gain to decrease the
crossover frequency.
5) The high-frequency gain may be reduced, thus
reducing the crossover frequency, as long as the
zero due to the compensation network remains at
or below the crossover frequency. In this case:
and:
Choose C
OUT
, R
C
, and C
C
to simultaneously satisfy
both equations.
Continuous Inductor Current
For continuous inductor current, there are two condi-
tions that change, requiring different compensation.
The response of the control loop includes a right-half-
plane zero and a complex pole pair due to the inductor
and output capacitor. For stable operation, the con-
troller loop gain must drop below unity (0dB) at a much
lower frequency than the right-half-plane zero frequen-
cy. The zero arising from the ESR of the output capaci-
tor is typically used to compensate the control circuit
by increasing the phase near the crossover frequency,
increasing the phase margin. If a low-value, low-ESR
output capacitor (such as a ceramic capacitor) is used,
the ESR-related zero occurs at too high a frequency
and does not increase the phase margin. In this case,
use a lower value inductor so that it operates with dis-
continuous current (see the
Discontinuous Inductor
Current
section).
For continuous inductor current, the gain of the voltage
divider is A
VDV
= V
REF
/ V
OUT,
and the DC gain of the
error amplifier is A
VEA
= 2000. The gain through the
PWM controller in continuous current is:
Thus, the total DC loop gain is:
The complex pole pair due to the inductor and output
capacitor occurs at the frequency (in Hz):
V
V
IN
2
π
The pole and zero due to the compensation network at
COMP occur at the frequencies (in Hz):
The frequency (in Hz) of the zero due to the ESR of the
output capacitor is:
The right-half-plane zero frequency (in Hz) is:
Z
(1 - D) R
2 L
RHP
LOAD
=
Z
C
ESR
O
OUT
=
1
2
π
Z
R C
C
C
=
1
2
π
P
G
C
C
C
EA
π
C
C
=
=
4000
1
4 10
7
π
P
LC
O
OUT
OUT
=
A
V
V
VDC
OUT
IN
=
2000
A
V
V
V
VO
OUT
IN
REF
=
2
f
V
C
1
C
C
REF
π
EA
OUT
C
C
C
=
≥
G
R
D
R
π
12
ESR
D
6 V
EA
C
ERF
≤
G
R
ESR
≤
D
f
V
C
C
REF
OUT
=π
D
C
C
V
- V
2(
V
- V
C
OUT OUT
OUT
IN
OUT
C OUT(MAX)
IN
=
R
)
Z
1
2(V
- V
V
- V
C
C
R C
OUT
R
)
IN)
OUT
IN
LOAD(MIN)
OUT
=
=
2
2
π
π
(
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參數(shù)描述 |
|---|---|
| MAX1800EHJ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1800EHJ-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1800EVKIT | 功能描述:電源管理IC開發(fā)工具 RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MAX1801EKA | 制造商:Maxim Integrated Products 功能描述:DIGITAL CAMERA STEP-UP SLAVE DC-DC - Rail/Tube |
| MAX1801EKA+ | 制造商:Maxim Integrated Products 功能描述:DC DC CNTRLR SGL-OUT STEP UP 2.7V TO 5.5V 8PIN SOT-23 - Rail/Tube |
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