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參數(shù)資料
| 型號： | MAX685ETG+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual-Output (Positive and Negative), DC-DC Converter for CCD and LCD |
| 中文描述： | 0.44 A DUAL SWITCHING CONTROLLER, 480 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, 0.8 MM HEIGHT, MO-20, TQFN-24 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 344K |
| 代理商： | MAX685ETG+ |
MAX685
Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
_______________________________________________________________________________________
9
Setting the Output Voltage
The resistor-divider formed by R4 and R3 sets the neg-
ative output voltage; the resistor-divider formed by R1
and R2 sets the positive output voltage. Let R4 be a
value near 100k
to set a resistor-divider current of
approximately 10A. Determine the value of R3 by the
following:
Let R2 be a value near 100k
to set a resistor-divider
current of approximately 10A. Determine the value of
R1 with the following formula:
R1 = R2 x (VOUT+ - 1.24V) / 1.24
Damping LX
LXN and LXP may ring at the conclusion of each
switching cycle when the inductor current falls to zero.
Typically the ringing waveform appears only on LX_
and has no effect on output ripple and noise. If LX_
ringing is still objectionable, it may be damped by con-
necting a series RC in parallel with L1. Typically 1k
in
series with 100pF provides good damping with only 3%
efficiency degradation. See Figure 5.
RR
V
OUT
34
124
.
=
Any manufacturer
0.22F ceramic
capacitor
C2
Any manufacturer
47pF ceramic cap
C5
Any manufacturer
2.2F ceramic
capacitor
C3, C4
Murata LHQ4N220J04 or
TDK NLC32522T-220K
22H, 0.4A
inductor
L1
Motorola MBR0520LT1 (0.5A)
or Central Semiconductor
CMPSH-3
0.1A, 20V
Schottky rectifier
D1, D2
REF
Sprague 595D106X0010A2T or
AVX TAJA106K010R
10F, 10V
tantalum cap
C1
MANUFACTURER
PART NUMBER
DESCRIPTION
Table 1. Component Values for the
Typical Operating Circuit
Figure 5. LXN and LXP Waveforms with a Series-Connected
1k
Resistor and 100pF Capacitor Connected in Parallel with
L1 to Damp Ringing
+15V
+5V
0V
+5V
0V
-7.5V
LXN
LXP
___________________Chip Information
TRANSISTOR COUNT: 902
SUBSTRATE CONNECTED TO GND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX685ETG+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DC/DC Converter for CCD & LCD 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 |
| MAX685ETG+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DC/DC Converter for CCD & LCD 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 |
| MAX685ETG-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 |
| MAX685EUE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX685EVKIT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Evaluation Kit for the MAX685 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 |
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