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參數(shù)資料
| 型號： | LTC4090EDJC#TRPBR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO22 |
| 封裝： | 6 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WXXX, DFN-22 |
| 文件頁數(shù)： | 15/28頁 |
| 文件大?。?/td> | 392K |
| 代理商： | LTC4090EDJC#TRPBR |
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LTC4090
22
4090f
Boost Pin Considerations
Capacitor C2 (see Block Diagram) and an internal diode
are used to generate a boost voltage that is higher than
the input voltage. In most cases, a 0.47μF capacitor will
work well. The BOOST pin must be at least 2.3V above
the SW pin for proper operation.
High Voltage Regulator Soft-Start
The HVEN pin can be used to soft-start the high voltage
regulator of the LTC4090, reducing maximum input cur-
rent during start-up. The HVEN pin is driven through an
external RC lter to create a voltage ramp at this pin. Figure
7 shows the start-up and shutdown waveforms with the
soft-start circuit. By choosing a large RC time constant,
the peak start-up current can be reduced to the current
that is required to regulate the output, with no overshoot.
Choose the value of the resistor so that it can supply 20μA
when the HVEN pin reaches 2.3V.
Synchronization and Mode
The SYNC pin allows the high voltage regulator to be
synchronized to an external clock.
Synchronizing the LTC4090 internal oscillator to an
external frequency can be done by connecting a square
wave (with 20% to 80% duty cycle) to the SYNC pin. The
square wave amplitude should be such that the valleys are
below 0.3V and the peaks are above 0.8V (up to 6V). The
high voltage regulator may be synchronized over a 300kHz
to 2MHz range. The RT resistor should be chosen such
that the LTC4090 oscillates 25% lower than the external
synchronization frequency to ensure adequate slope com-
pensation. While synchronized, the high voltage regulator
will turn on the power switch on positive going edges of
the clock. When the power good (PG) output is low, such
as during start-up, short-circuit, and overload conditions,
the LTC4090 will disable the synchronization feature. The
SYNC pin should be grounded when synchronization is
not required.
Alternate NTC Thermistors and Biasing
The LTC4090 provides temperature qualied charging if
a grounded thermistor and a bias resistor are connected
to NTC (see Figure 8). By using a bias resistor whose
value is equal to the room temperature resistance of the
thermistor (R25C) the upper and lower temperatures are
pre-programmed to approximately 50°C and 0°C, respec-
tively (assuming a Vishay “Curve 2” thermistor).
The upper and lower temperature thresholds can be ad-
justed by either a modication of the bias resistor value
APPLICATIONS INFORMATION
Figure 8. Typical NTC Thermistor Circuit
Figure 9. NTC Thermistor Circuit with Additional Bias Resistor
–
+
–
+
RNOM
10k
RNTC
10k
NTC
VNTC
6
0.1V
NTC_ENABLE
4090 F08
NTC BLCOK
TOO_COLD
TOO_HOT
0.738 VNTC
0.29 VNTC
–
+
5
–
+
–
+
RNOM
13.2k
RNTC
10k
R1
1.97k
NTC
VNTC
6
0.1V
NTC_ENABLE
4090 F09
TOO_COLD
TOO_HOT
0.738 VNTC
0.29 VNTC
–
+
5
NTC BLCOK
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