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参数资料
| 型号： | MAX1565 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply |
| 中文描述： | 小型、高效率、5路输出数码相机电源 |
| 文件页数： | 15/26页 |
| 文件大小： | 512K |
| 代理商： | MAX1565 |
Note that the step-up output supplies both the step-up
load and the step-down input current when the step-
down is powered from the step-up. The step-down
input current reduces the available step-up output cur-
rent for other loads.
Direct Battery Step-Down Operation
The step-down converter can also be operated directly
from the battery as long as the voltage at INSD does
not exceed OUTSU by more than a Schottky diode for-
ward voltage. When using this connection, connect a
Schottky diode from the battery input to OUTSU. There
is also an internal 10k
resistance from OUTSU to
INSD, which adds a small additional current drain (of
approximately (V
OUTSU
- V
INSD
)/10k
from OUTSU
when INSD is not connected directly to OUTSU.
Step-down direct battery operation improves efficiency
for the step-down output (up to 95%), but limits the
upper limit of the output voltage to 200mV less than the
minimum battery voltage. In 1-cell Li+ designs (with a
2.7V min), the output can be set up to 2.5V. In 2-cell
alkaline or NiMH designs, the output may be limited to
1.5V or 1.8V, depending on the minimum allowed cell
voltage.
The step-down can only be briefly operated in dropout
since the MAX1565 fault protection detects the out-of-
regulation condition and activates after 100,000 OSC
cycles, or 200ms at 500kHz. At that point, all MAX1565
channels shut down.
Auxiliary DC-to-DC Controllers
The three auxiliary controllers operate as fixed-frequency
voltage-mode PWM controllers. They do not have
internal MOSFETs, so output power is determined by
external components. The controllers regulate output
voltage by modulating the pulse width of the DL_ drive
signal to an external N-channel MOSFET switch.
Figure 3 shows a functional diagram of an AUX
controller channel. A sawtooth oscillator signal at OSC
governs timing. At the start of each cycle, DL_ goes
high, turning on the external N-FET switch. The switch
then turns off when the internally level-shifted sawtooth
rises above COMP_ or when the maximum duty cycle is
exceeded. The switch remains off until the start of the
next cycle. A transconductance error amplifier forms an
integrator at COMP_ so that DC high-loop gain and
accuracy can be maintained.
The auxiliary controllers do not start until the step-up
DC-to-DC output is in regulation. If the step-up, step-
down, or any of the auxiliary controllers remains faulted
for 100,000 OSC cycles, then all MAX1565 channels
latch off.
M
Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
______________________________________________________________________________________
15
R
Q
S
CLK
REFI
0.85 REF
DL_
FAULT
PROTECTION
ENABLE
LEVEL
SHIFT
REF
COMP
FB
OSC
SOFT-
START*
*SOFT-START RAMPS REFI FROM 0V TO V
REF
IN 4096 CLOCK CYCLES.
Figure 3. PWM Auxiliary Controller Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1565ETJ | Small, High-Efficiency, Five-Channel Digital Still Camera Power Supply |
| MAX1566-MAX1567 | Six-Channel, High-Efficiency, Digital Camera Power Supplies |
| MAX156ACNG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
| MAX156BCNG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
| MAX156BENG | 8-/4-Channel ADCs with Simultaneous T/Hs and Reference |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1565ETJ | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565ETJ+ | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565ETJ+T | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565ETJ-T | 功能描述:PMIC 解决方案 5Ch Digital Camera Power Supply RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
| MAX1565EVKIT | 制造商:Maxim Integrated Products 功能描述:SMALL, HIGH-EFFICIENCY, FIVE-CHANNEL DSC - Bulk |
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