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參數(shù)資料
| 型號(hào)： | LT1508CS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A POWER FACTOR CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 232K |
| 代理商： | LT1508CS |
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7
LT1508
RSET (Pin 15): A resistor from RSET to GND sets the
oscillator charging current and the maximum multiplier
output current which is used to limit the maximum line
current.
IM(MAX) = 3.75V/RSET
SS1 (Pin 16): Soft Start. SS1 is reset to zero for low VCC.
When VCC rises above the lockout threshold, SS1 is
released to ramp up at a rate set by the internal 12
A
current source and an external capacitor. During this ramp
up, PFC reference voltage is equal to SS1 voltage. After
SS1 rises past 7.5V, reference voltage remains at 7.5V.
VCC (Pin 17): This is the supply for the chip. The LT1508
has two fast gate drivers required to fast charge high
power MOSFET gate capacitances. Good supply bypass-
ing is required consisting of a 0.1
F ceramic capacitor in
parallel with a low ESR electrolytic capacitor (56
F or
higher) in close proximity to IC GND.
PWM SECTION
SS2 (Pin 13): PWM Soft Start. The comparator PWMOK
monitors the OVP pin and releases the SS2 after the PFC
output gets close to the final voltage.
VC (Pin 18): PWM voltage mode control voltage. Normally
connects to the optocoupler amplifier output. A pull-up
current of 50
A flows out of the pin.
ILIM (Pin 19): PWM current sense input with limit set to
1.1V.
GTDR2 (Pin 20): The PWM MOSFET gate driver is a 1.5A
fast totem pole output. It is clamped at 15V. Capacitive
loads like the MOSFET gates may cause overshoot. A gate
series resistor of at least 5
will prevent the overshoot.
APPLICATIONS INFORMATION
WU
U
Voltage Error Amplifier (PFC Section)
The voltage error amplifier has a 100dB DC gain and 3MHz
unity-gain frequency. The output is internally clamped at
13.3V with VCC = 18V. Maximum error amp output voltage
decreases to VCC – 1.5V for VCC less than 12V. The
noninverting input is tied to the 7.5VREF through a diode
and can be pulled down with the SS1 pin. Referring to
Figure 1, VOUT = VREF [(R1 + R2)/R2]. With R1 = 1M and
R2 = 20k, VOUT = 382V. R1 through R4, C1 and C2 form the
compensation for the voltage loop. Gain of the voltage
error amp with the values shown is given by:
VAOUT
VOUT
= –
1 + j
(j)(f)(6.6)
f
1
f
11
1 + j
)
The small-signal gain for the remaining portion of the
voltage loop for frequencies below the current loop band-
width is (see Figure 2):
VOUT
VAOUT
VIN
(5
π)(j)(f)(COUT)(VOUT)
(RREF)(PIN)
RS(RIAC + 25k)
=
C1
0.47
F
7.5VREF
1.05VREF
OVERVOLTAGE
COMPARATOR
LT1508
R3
20k
R4
330k
C2
0.047
F
REGULATOR OUTPUT
VOUT = 382V
1508 F01
VSENSE
OVP
VAOUT
ERROR AMP
R1
1M
R2
20k
–
+
–
+
Figure 1
(For application help with the PFC portion of this chip, see the LT1248 data sheet)
PIN FUNCTIONS
UU
U
With VIN = 120VAC, PIN = 150W, RS = 0.15, RREF = 4k,
RIAC = 1M, VOUT = 382V and COUT = 470F, VOUT/VAOUT =
85/(j)(f). At very low frequencies, the loop has a – 40dB/
decade slope. Additional zero-pole compensation is added
at 1Hz and 11Hz. The resulting loop gain and phase margin
is shown in Figure 3. The unity-gain bandwidth is low
compared to 120Hz, which results in low distortion and a
high power factor.
相關(guān)PDF資料 |
PDF描述 |
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| LT1508IS | 1.5 A POWER FACTOR CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO20 |
| LT1620CMS8#TR | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| LT1621IGN#TR | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| LT1620CS8#TR | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| LT1620IGN#TR | SPECIALTY ANALOG CIRCUIT, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1508CSW | 功能描述:IC PWM/POWER FACTOR CNTRLR20SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - PFC（功率因數(shù)修正） 系列:- 產(chǎn)品培訓(xùn)模塊:GreenChip Synchronous Rectification Control Family of ICs 標(biāo)準(zhǔn)包裝:1 系列:- 模式:間歇導(dǎo)電（DCM） 頻率 - 開(kāi)關(guān):- 電流 - 啟動(dòng):- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:Digi-Reel® 其它名稱(chēng):568-5348-6 |
| LT1508I | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Power Factor and PWM Controller(Voltage Mode) |
| LT1508IN | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Power Factor and PWM Controller(Voltage Mode) |
| LT1508ISW | 功能描述:IC PWM/POWER FACTOR CNTRLR20SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - PFC（功率因數(shù)修正） 系列:- 產(chǎn)品培訓(xùn)模塊:GreenChip Synchronous Rectification Control Family of ICs 標(biāo)準(zhǔn)包裝:1 系列:- 模式:間歇導(dǎo)電（DCM） 頻率 - 開(kāi)關(guān):- 電流 - 啟動(dòng):- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SO 包裝:Digi-Reel® 其它名稱(chēng):568-5348-6 |
| LT1509 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Power Factor and PWM Controller |
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