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參數(shù)資料
| 型號： | LX1562 |
| 廠商： | Microsemi Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | SECOND-GENERATION POWER FACTOR CONTROLLER |
| 中文描述： | 第二代功率因數(shù)控制器 |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 443K |
| 代理商： | LX1562 |
S
ECOND
-G
ENERATION
P
OWER
F
ACTOR
C
ONTROLLER
LX1562/1563
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
Copyright 1996
Rev. 1.3 12/96
14
P
R O D U C T I O N
D
A T A
S
H E E T
I C D E S C R I P T I O N
ERROR AMPLIFIER
The error amplifier is an internally compensated op-amp with
access to the inverting input and the output pin. The non-
inverting input is internally connected to the voltage reference
and is not available for external connection. The amplifier is
designed for an open loop gain of 80dB, along with a typical
bandwidth of 1.7MHz and 49 degrees of phase margin. The
boost output voltage of the power factor pre-regulator is di-
vided down and monitored by the inverting input. Input bias
current (0.5μA max) can cause an output voltage error that is
equal to the product of the input bias current and the value of
the upper divider resistor. The amplifier's output is available
for external loop compensation. Typically, the loop bandwidth
is set below 10Hz in order to reject the low frequency ripple
associated with 2X the line frequency. For example, if the
error amplifier is configured as an integrator with 1.2Hz band-
width, it will have 40dB ripple rejection at 120Hz frequency.
This means that if the output of the error amp is allowed to
have 100mV of ripple, the boost converter must be limited to
less than 10V of ripple on its output.
To prevent boost output run away condition that may occur
during removal of the output load, a separate comparator moni-
tors the E.A. output voltage and compares it to an internal 1.8V
reference. When load is removed, E.A. output swings lower
than 1.8V, trips the comparator and turns output driver off till
the inverting input voltage drops below 2.5V. At this point, the
E.A. output swings positive, turns the output driver back on
and repeats the cycle until the load is returned to normal con-
dition.
To reduce output overshoot during line and load transients,
the E.A. output is clamped to two diode drops above the refer-
ence voltage. This prohibits the amplifier from being satu-
rated, allowing it to recover faster thus minimizing the boost
voltage overshoot.
VOLTAGE REFERENCE
(continued)
V
HYST
C1
DISCHARGE
V
START
BOOTSTRAP
WINDING
R
T
& C
T
TIME CONSTANT
V
C1
t
DISCHARGE
TIME
FIGURE 25
— START-UP CAPACITOR VOLTAGE
VOLTAGE REFERENCE
The voltage reference is a low drift bandgap design which pro-
vides a stable +2.5V output with maximum of ±1.5% initial ac-
curacy. This voltage is internally tied to the non-inverting in-
put of the amplifier and is not available for external connec-
tion. The initial accuracy of the reference includes error am-
plifier input offset voltage. Figure 26 shows typical variation of
the reference voltage vs. temperature.
FIGURE 27
— THE AMPLIFIER CONFIGURED AS AN INTEGRATOR
FOR LOOP COMPENSATION
From I
DET
Logic
1.8V
OUTPUT
DRIVE
7
1
2
V
REF
C4
V
O
I
9
R9
R10
Bias
BW =
1
2
π
R
9
C4
I
9
>> I
BIAS
2f
f = Line Freq.
2.47
2.45
(T
A
) Ambient Temperature - (°C)
2.52
(
R
)
2.48
-50
-25
0
25
50
75
100
125
V
CC
= 12V
C
L
= 1nF
2.46
2.49
2.50
2.51
FIGURE 26
—
REFERENCE VOLTAGE (Including Offset) vs. TEMPERATURE
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