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參數(shù)資料
| 型號： | LT1508ISW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Power Factor and PWM Controller(Voltage Mode) |
| 中文描述： | POWER FACTOR CONTROLLER WITH POST REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.300 INCH, PLASTIC, SO-20 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 337K |
| 代理商： | LT1508ISW |
6
LT1508
TYPICAL PERFOR
M
A
N
CE CHARACTERISTICS
R
SET
Voltage vs Current
PK
LIM
Pin Characteristics
PFC SECTION
GTDR1 (Pin 1):
The PFC MOSFET gate driver is a fast
totem pole output which 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.
GND2 (Pin 2):
Power Ground. High current spikes occur
in this line when either GTDR1 or GTDR2 switches low.
GND1 (Pin 3):
Analog Ground.
C
SET
(Pin 4):
The capacitor from this pin to GND and R
SET
determines oscillator frequency. The oscillator ramp is 5V
and the frequency = 1.5/(R
SET
C
SET
).
PK
LIM
(Pin 5):
The threshold of the peak current limit
comparator is GND. To set current limit, a resistor divider
can be connected from V
REF
to the current sense resistor.
CA
OUT
(Pin 6):
This is the output of the current amplifier
that senses and forces the line current to follow the
reference signal that comes from the multiplier by com-
manding the pulse width modulator. When CA
OUT
is low,
the modulator has zero duty cycle.
I
SENSE
(Pin 7):
This is the inverting input of the current
amplifier. This pin is clamped at –0.6V by an ESD protec-
tion diode.
M
OUT
(Pin 8):
This is the multiplier high impedance
current output and the noninverting input of the current
amplifier. This pin is clamped at –0.6V and 3V.
I
AC
(Pin 9):
This is the AC line voltage sensing input to the
multiplier. It is a current input that is biased at 2V to
minimize the crossover dead zone caused by low line
voltage. At the pin, a 25k resistor is in series with the
current input, so that a lowpass RC can be used to filter out
the switching noise coming down from the line with a high
line impedance environment.
VA
OUT
(Pin 10):
This is the output of the voltage error
amplifier. The output is clamped at 13.5V. When the
output goes below 2.5V, the multiplier output current is
zero.
OVP (Pin 11):
This is the input to the overvoltage com-
parator. The threshold is 1.05 times the reference voltage.
When the comparator trips, the multiplier, which is quickly
inhibited, blanks PFC switching to prevent further over-
shoot. This pin is also the input to the PWMOK comparator
that releases the PWM soft start (SS2) after the PFC output
gets close to the final voltage and has a hysteresis of
approximately 150V for 382V PFC output.
V
REF
(Pin 12):
This is the 7.5V reference. When V
CC
goes
low, V
REF
will stay at 0V. V
REF
biases most of the internal
circuitry and can source up to 5mA externally.
V
SENSE
(Pin 14):
This is the inverting input to the voltage
amplifier.
(For application help with the PFC portion of this chip, see the LT1248 data sheet)
PI
FU
CTIO
N
S
U
U
R
SET
CURRENT (mA)
V
S
R
120
100
80
60
40
20
0
–20
–40
–60
–80
–100
1508 G12
–1.0
–0.8
–0.6
–0.4
–0.2
0
T
J
= 125
°
C
T
J
= 25
°
C
T
J
= –55
°
C
PK
LIM
VOLTAGE (V)
P
L
μ
A
–360
–300
–240
–180
–120
–60
0
60
120
180
240
300
1508 G13
0.8
0.4
0
–0.4
–0.8
T
J
= 125
°
C
T
J
= 25
°
C
T
J
= –55
°
C
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| LT1509CN#PBF | 功能描述:IC PFC CTRLR AVERAGE CURR 20DIP RoHS:是 類別: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 - 開關(guān):- 電流 - 啟動:- 電源電壓:8.6 V ~ 38 V 工作溫度:-20°C ~ 150°C 安裝類型: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:568-5348-6 |
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