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參數(shù)資料
| 型號： | LT3582EUD#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.72 A SWITCHING REGULATOR, PQCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-220WEED-2, QFN-16 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 315K |
| 代理商： | LT3582EUD#PBF |
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LT3582/LT3582-5/LT3582-12
14
3582512fb
OTP2/REG2: Data in address 02h congures the output
voltage sequencing, sets a ne voltage adjust for VOUTP,
and determines if further OTP programming is permitted or
not. Proper uses of the bits in address 02h are discussed
in the following sections.
Setting the Output Voltages (VP, VPLUS and VN Bits)
The LT3582 series contains two resistor dividers which are
programmable in the LT3582, to set the output voltages.
The positive output voltage VOUTP is adjustable in 25mV
steps by setting the VP bits in REG0/OTP0 in addition to
the VPLUS bit in REG2/OTP2.
VOUTP = 3.2V + (VP 50mV) + (VPLUS 25mV)
where:
VP = an integer value from 0 to 191
VPLUS = 0 or 1
The VOUTN voltage is adjustable in –50mV steps by setting
the VN bits in REG1/OTP1.
VOUTN = –1.2V – (VN 50mV)
where:
VN = an integer value from 0 to 255
Dynamically Changing the Output Voltage (LT3582 Only):
After output regulation has been reached, it’s possible to
change the output voltages by writing new values to the
VN or VP bits. When reducing the magnitude of an out-
put voltage, it will decay at a rate dependent on the load
current and capacitance. Conguring a large increase in
magnitude of an output voltage can cause a large increase
in switch current to charge the output capacitor. Before
reconguring the outputs, consider forcing a soft-start
by asserting the SWOFF bit before writing the new VP or
VN codes. Subsequently clearing SWOFF initiates the new
soft-start sequence.
Soft-Start/Output Voltage Ramping (IRMP Bits)
The LT3582 series contains soft-start circuitry to control the
output voltage ramp rates, therefore limiting peak switch
currents during start-up. High switch currents are inherent
in switching regulators during start-up since the feedback
loop is saturated due to VOUT being far from its nal value.
The regulator tries to charge the output capacitor as quickly
as possible which results in large currents.
Capacitors must be connected from RAMPP and RAMPN
to ground for soft-start. During shutdown or when the
SWOFF bit is set, the RAMP capacitors are discharged
to ground. After SHDN rises or SWOFF is cleared, the
capacitors are charged by programmable (LT3582 only)
currents, thus creating linear voltage ramps. The VOUT
voltages ramp in proportion to their respective RAMP
voltages according to:
VOUT _RAMP _RATE =
VOUT
0.8V
IRAMP
CRAMP
Volts / Sec
Proportionality Constant
RAMP pin ramp rate (V/Sec)
where:
IRAMP = RAMP pin charging current set by IRMP
bits (1μA, 2μA, 4μA or 8μA for LT3582,
1μA for LT3582-5/LT3582-12)
CRAMP = External RAMP pin capacitor (Farads)
VOUT = Output voltage during regulation
For example, selecting IRAMP = 1μA, CRAMP = 10nF and
VOUTP = 12V results in a power-up ramp rate of 1.5Volt/ms
(see Figure 6).
Ramp rates less than 1-10V/ms generally result in good
start-up characteristics. The outputs should linearly follow
the RAMPx voltages with no distortions. Figure 7 shows
an excessive start-up ramp rate of ~120V/ms in which
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