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參數(shù)資料
| 型號： | ML4818CP |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Phase Modulation/Soft Switching Controller |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP24 |
| 封裝： | POWER, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 92K |
| 代理商： | ML4818CP |
PRODUCT SPECIFICATION
ML4818
REV. 1.0.3 6/21/01
9
Since the per cycle charge on RC
RESET
is proportional to how
early in the power cycle the over-current occurs, a reset will
occur more quickly under output short circuit conditions
(Figures 11a and 11b) than during a load surge (Figures 11c
and 11d).
When the soft start reset occurs, the output is inhibited and
the soft start capacitor is discharged. The output will remain
off until C
RST
discharges to 1.3V through R
RST
, providing a
reset delay. When the IC restarts, the error amplifier output
voltage is limited to the voltage at SOFT START, thus limit-
ing the duty cycle.
Under-Voltage Lockout
On power up, when V
CC
is below 16V, the IC draws very lit-
tle current (1.1mA typ.) and V
REF
is disabled. When V
CC
rises
above 16V, the IC becomes active and V
REF
is enabled and
will stay in that condition until V
CC
falls below 10.2V. (see
Figure 12).
Figure 11a, 11b. I
LIMIT
and Resulting RC
RESET
Waveforms During Short Circuit
Figure 11c, 11d. I
and Resulting RC
RESET
Waveforms During Load Surge
Figure 12. Under-Voltage Lockout and Reference Circuits
Figure 13. Supply Current vs. Temperature (
°
C)
1V
3.4V
V(PIN 4)
V(PIN 12)
1V
3.4V
V(PIN 4)
V(PIN 12)
INHIBIT
OUTPUTS
–
+
+
–
20
24
INTERNAL
BIAS
4V
TO LOGIC
CIRCUITS
5V
V
REF
9V
V
CC
POWER
DOWN
70
68
66
64
62
60
58
56
54
52
50
–
75
–
25
25
75
125
175
TEMPERATURE
S
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4818CP | 制造商:Fairchild Semiconductor Corporation 功能描述:CONTROLLER IC ROHS COMPLIANT:NO |
| ML4818CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Phase Modulation/Soft Switching Controller |
| ML4819 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor and PWM Controller Combo |
| ML4819CP | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PFC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4819CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor and PWM Controller Combo |
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