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| 型号： | LX1554ID-TR |
| 厂商： | MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14 |
| 封装： | ROHS COMPLIANT, PLASTIC, SOIC-14 |
| 文件页数： | 6/18页 |
| 文件大小： | 483K |
| 代理商： | LX1554ID-TR |
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
LX1552/3/4/5
PRODUCT D A T ABOOK 1996/1997
Copyright 1994
Rev. 1.0b
14
P RODUCTIO N D ATA
S HEET
Given: frequency
f; maximum duty-cycle Dm
Calculate:
1)
R
T = 277
(
), 0.3 ≤ Dm ≤ 0.95
Note: R
T must always be greater than 520 for proper
operation of oscillator circuit.
2)
C
T =
(f)
for duty cycles above 95% use:
3)
f
≈
where R
T ≥ 5k
THEO R Y OF OPER A TION
OSCILLATOR
(continued)
The oscillator is designed such that many values of R
T and CT will
give the same frequency, but only one combination will yield a
specific duty cycle at a given frequency. A set of charts as well
as the timing equations are given to determine approximate
values of timing components for a given frequency and duty
cycle.
1-Dm
Dm
(1.74)
-1
1
Dm
1.81
R
TCT
(1.74)
-1
Example: A flyback power supply design requires the duty cycle
to be limited to less than 45%. If the output switching frequency
is selected to be 100kHz, what are the values of R
T and C T for the
a) LX1552/53, and the b) LX1554/55 ?
FIGURE 28 — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
0.1
0
40
(R
T)
Timing Resistor - (k )
100
Maximum
Duty
Cycle
-
(%)
20
50
80
1
10
100
10
60
70
90
30
V
CC = 15V
T
A = 25°C
1.81 * Dm
f * R
T
100
0.1
1
1000
Oscillator
Frequency
-
(kHz)
(R
T)
Timing Resistor - (k )
100
10
1
10
V
CC = 15V
T
A = 25°C
C
T = 3.3nF
C
T = 1nF
C
T = 6.8nF
C
T = 22nF
C
T = 47nF
C
T = 0.1F
FIGURE 27 — OSCILLATOR FREQUENCY vs. TIMING RESISTOR
a) LX1552/53
Given: f = 100kHz
Dm = 0.45
R
T = 267
= 669
C
T =
= .012
f
b) LX1554/55
f
OUT = fOSC
(due to internal flip flop)
f
OSC = 200kHz
select C
T = 1000pf
using Figure 27 or Equation 3: R
T = 9.1k
(1.74)
-1
(1.74)
-1
1
.45
.55
.45
1.81 * 0.45
100x103 * 669
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