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參數(shù)資料
| 型號： | MAX742CWP |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Switch-Mode Regulator with +5V to 【12V or 【15V Dual Output |
| 中文描述： | SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | SO-20 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 143K |
| 代理商： | MAX742CWP |
M
S witc h-Mode Regulator with
+5V to ±12V or ±15V Dual Output
12
______________________________________________________________________________________
Table 1. Trouble-Shooting Chart
___________________Chip Topography
GND
EXT+
V+
EXT-
AV+
PUMP
PDRV
12/15
100/200
VREF
AGND
CC+ FB+ CSH+ CSL+
CSH-
CSL-
CC-
SS
FB-
0.135"
(3.45mm)
0.080"
(2.03mm)
TRANSISTOR COUNT: 375
SUBSTRATE CONNECTED TO V+
SYMPTOM
Unstable Output.
Noise or jitter on
output ripple
waveform. Scope
may not trigger
correctly.
CORRECTION
Output is unloaded. Apply ±30mA or
greater load to observe waveform.
No Switching.
±VO are correct,
but no waveform is
seen at LX+ or LX-.
A. Check connections. VREF should be +2V.
B. When input voltage is less than +4.2V,
undervoltage lockout is enabled.
No Output.
+VO
= 5V or less. -VO
= 0V.
A. Inductor saturation: Peak currents
exceed coil ratings.
B. MOSFET on-resistance too high.
C. Switching losses: Diode is slow or has high
forward voltage. Inductor has high DC resis-
tance. Excess capacitance at LX nodes.
D. Inductor core losses: Hysteresis losses
cause self-heating in some core materials.
E. Loop instability: See
Unstable Output
above.
Poor Efficiency.
Supply current is
high. Output will
not drive heavy
loads.
A. Input overvoltage: Never apply more
than +12V.
B. FB+ or FB- disconnected or shorted. This
causes runaway and output overvoltage.
C. CC+ or CC- shorted.
D. Output filter capacitor disconnected.
Self-Destruction.
Transistors or IC
die on power-up.
A. Ground noise: Probe ground is picking up
switching EMI. Reduce probe ground lead
length (use probe tip shield) or put circuit
in shielded enclosure.
B. Poor HF response: Add ceramic or
tantalum capacitors in parallel with output
filter capacitors.
Noisy Output.
Switching is
steady, but large
inductive spikes
are seen at the
outputs.
Loop stability problem.
A. CC+ or CC- disconnected.
B. EMI: Move inductor away from IC or use
shielded inductors. Keep noise sources
away from CC- and CC+.
C. Grounding: Tie AGND directly to the filter
capacitor ground lead. Ensure that cur-
rent spikes from GND do not cause noise
at AGND or compensation capacitor or
reference bypass ground leads. Use wide
PC traces or a ground plane.
D. Bypass: Tie 10μF or larger between AGND
and VREF. Use 150μF to bypass the input
right at AV+. If there is high source resis-
tance, 1000μF or more may be required.
E. Current limiting: Reduce load currents.
Ensure that inductors are not saturating.
F. Slope compensation: Inductor value not
matched to sense resistor.
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| MAX742CWP+ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX742CWP+T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX742CWP-T | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX742EPP | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MAX742EPP+ | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Switch-Mode Regulator RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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