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부품번호 LX1553 기능
기능 ULTRA-LOW START-UP CURRENT/ CURRENT-MODE PWM
제조업체 Microsemi Corporation
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LX1553 데이터시트, 핀배열, 회로
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N DO C # : 1552
LX1552/3/4/5
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
PRODUCTION DATA SHEET
DESCRIPTION
The LX155X family of ultra-low start-up
current (250µA max.), current mode
control IC's offer new levels of energy
efficiency for offline converter applica-
tions. They are ideally optimized for
personal computer and CRT power
supplies although they can be used in
any number of off-line applications
where energy efficiency is critical.
Coupled with the fact that the LX155X
series requires a minimal set of external
components, the series offers an
excellent value for cost conscious
consumer applications.
Optimizing energy efficiency, the
LX155X series demonstrates a signifi-
cant power reduction as compared with
other similar off-line controllers. Table 1
compares the SG384X, UC384XA and
the LX155X start-up resistor power
dissipation. The LX155X offers an
overall 4X reduction in power dissipa-
tion. Additionally, the precise oscillator
discharge current gives the power
supply designer considerable flexibility
in optimizing system duty cycle
consistency.
The current mode architecture
demonstrates improved load regulation,
pulse by pulse current limiting and
inherent protection of the power supply
output switch. The LX155X includes a
bandgap reference trimmed to 1%, an
error amplifier, a current sense com-
parator internally clamped to 1V, a high
current totem pole output stage for fast
switching of power mosfet's, and an
externally programmable oscillator to
set operating frequency and maximum
duty cycle. The undervoltage lock-out
circuitry is designed to operate with as
little as 250µA of supply current
permitting very efficient bootstrap
designs.
PRODUCT HIGHLIGHT
TYPICAL APPLICATION OF LX155X USING ITS
MICROPOWER S TART-UP FEATURE
TABLE 1
AC
INPUT
R ST
I ST
VCC
LX1552
or
LX1554
Design Using
SG384x UC384xA LX155x
Max. Start-up Current
Specification (IST)
1000µA
500µA
250µA
Typical Start-Up
Resistor Value (RST)
62K124K248K
Max. Start-Up Resistor
Power Dissipation (PR)
2.26W
1.13W
0.56W
Note: Calculation is done for universal AC input speci-
fication of V =ACMIN 90VRMS to VACMAX= 265VRMS using the
following equation: (Resistor curr ent is selected to be
2 * IST at VACMIN.)
RST =
VAC MIN
2 * IST
,
PR =
2V
2
AC
MAX
RST
KEY FEATURES
s ULTRA-LOW START-UP CURRENT
(150µA typ.)
s TRIMMED OSCILLATOR DISCHARGE
CURRENT (±2% typ.)
s INITIAL OSCILLATOR FREQUENCY BETTER
THAN ±4%
s OUTPUT PULLDOWN DURING UVLO
s PRECISION 2.5V REFERENCE (±2% max.)
p CURRENT SENSE DELAY TO OUTPUT
(150ns typ.)
p AUTOMATIC FEED FORWARD
COMPENSATION
p PULSE-BY-PULSE CURRENT LIMITING
p ENHANCED LOAD RESPONSE
CHARACTERISTICS
p UNDER-VOLTAGE LOCKOUT WITH
HYSTERESIS
p DOUBLE PULSE SUPPRESSION
p HIGH CURRENT TOTEM POLE OUTPUT
(±1Amp peak)
p 500kHz OPERATION
A P P L I C AT I O N S
s ECONOMY OFF-LINE FLYBACK OR
FORWARD CONVERTERS
s DC-DC BUCK OR BOOST CONVERTERS
s LOW COST DC MOTOR CONTROL
AVAILABLE OP T I O N S PER PA RT #
Part # Start-Up Hysteresis Max. Duty
Voltage
Cycle
LX1552 16V
6V <100%
LX1553 8.4V 0.8V <100%
LX1554 16V
6V <50%
LX1555 8.4V 0.8V <50%
TA (°C)
M
Plastic DIP
8-pin
PACKAGE ORDER INFORMATION
DM
Plastic
8-pin
SOIC
D
Plastic SOIC
14-pin
Y
Ceramic DIP
8-pin
PW
TSSOP
20-pin
0 to 70
-40 to 85
-55 to 125
LX155xCM
LX155xIM
LX155xCDM
LX155xIDM
LX155xCD
LX155xID
LX155xMY
LX155xCPW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX1552CDMT)
Copyright © 1994
Rev. 1.0a 1/01
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1




LX1553 pdf, 반도체, 판매, 대치품
PRODUCT DATABOOK 1996/1997
LX1552/3/4/5
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
PRODUCTION DATA SHEET
E L E C T R I C A L C H A R A C T E R I S T I C S (Con't.)
Parameter
Symbol
Test Conditions
LX155xI/155xM
LX155xC
Units
Min. Typ. Max. Min. Typ. Max.
Under-Voltage Lockout Section
Start Threshold
VST 1552/1554
1553/1555
15 16 17 15 16 17
7.8 8.4 9.0 7.8 8.4 9.0
V
V
Min. Operation Voltage After Turn-On
1552/1554
9 10 11 9 10 11 V
1553/1555
7.0 7.6 8.2 7.0 7.6 8.2 V
PWM Section
Maximum Duty Cycle
1552/1553
94 96
94 96
%
1552/1553, RT = 698, CT = 22nF
1554/1555
50
47 48
50
47 48
%
%
Minimum Duty Cycle
0 0%
Power Consumption Section
Start-Up Current
Operating Supply Current
VCC Zener Voltage
IST
ICC
VZ ICC = 25mA
150 250
150 250
11 17
11 17
30 35
30 35
µA
mA
V
Notes: 2. These parameters, although guaranteed, are not 100% tested in
production.
3. Parameter measured at trip point of latch with VFB = 0.
4. Gain defined as:
A=
VCOMP
V
ISENSE
;
0
V
ISENSE
0.8V.
5. Adjust VCC above the start threshold before setting at 15V.
6. Output frequency equals oscillator frequency for the LX1552 and
LX1553. Output frequency is one half oscillator frequency for the
LX1554 and LX1555.
7. Temperature stability, sometimes referred to as average temperature
coefficient, is described by the equation:
V (max.) - V (min.)
Temp Stability = REF
REF
T (max.) - T (min.)
AA
VREF
(max.)
&
V
REF
(min.)
are
the
maximum
&
minimum
reference
voltage measured over the appropriate temperature range. Note that the
extremes in voltage do not necessarily occur at the extremes in
temperature.
VCC*
GROUND**
BLOCK DIAGRAM
34V
16V (1552/1554)
8.4V (1553/1555)
UVLO
S/R
16V (1552/1554)
8.4V (1553/1555)
5V
REF
INTERNAL
BIAS
VREF
VREF
GOOD LOGIC
RT/CT
VFB
COMP
ISENSE
OSCILLATOR
ERROR AMP
*** T
2R S
1V
R
R PWM
LATCH
CURRENT SENSE
COMPARATOR
* - VCC and VC are internally connected for 8 pin packages.
** - POWER GROUND and GROUND are internally connected for 8 pin packages.
*** - Toggle flip flop used only in 1554 and 1555.
VC*
OUTPUT
POWER GROUND**
4 Copyright © 1994
Rev. 1.0a 1/01

4페이지










LX1553 전자부품, 판매, 대치품
PRODUCT DATABOOK 1996/1997
ULTRA-LOW START-UP CURRENT, CURRENT-MODE PWM
PRODUCTION DATA SHEET
LX1552/3/4/5
CHARACTERISTIC CURVES
FIGURE 5. — OUTPUT INITIAL ACCURACY vs. TEMPERATURE
65.0
LX1552 and LX1553 only
63.5
62.0
60.5
VCC = 15V
RT = 698W
CT = 22nF
59.0
57.5
56.0
54.5
53.0
51.5
50.0
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 6. — OUTPUT DUTY CYCLE vs. TEMPERATURE
48
VCC = 15V
47 RT = 698W
CT = 22nF
46
45
44
43
42
41
40
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 7. — REFERENCE VOLTAGE vs. TEMPERATURE
5.03
5.02
5.01
VCC = 15V
IL = 1mA
5.00
4.99
4.98
4.97
4.96
4.95
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
FIGURE 8. — REFERENCE SHORT CIRCUIT CURRENT vs.
TEMPERATURE
180
165
150
135
120
105
90
75
60
45
30
-75 -50 -25 0 25 50 75 100 125
(TA) Ambient Temperature - (°C)
Copyright © 1994
Rev. 1.0a 1/01
7

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관련 데이터시트

부품번호상세설명 및 기능제조사
LX1552

ULTRA-LOW START-UP CURRENT/ CURRENT-MODE PWM

Microsemi Corporation
Microsemi Corporation
LX1553

ULTRA-LOW START-UP CURRENT/ CURRENT-MODE PWM

Microsemi Corporation
Microsemi Corporation

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