IP1843J-BSS2 [SEME-LAB]
Current Mode Regulating Pulse Width Modulator ; 电流模式稳压脉宽调制器\n
| 型号： | IP1843J-BSS2 |
| 厂家： | 
SEME LAB |
| 描述： | Current Mode Regulating Pulse Width Modulator
|
| 文件： | 总6页 (文件大小：47K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
IP1842 SERIES
IP1843 SERIES
TOP VIEW
CURRENT MODE
1
2
3
4
8
7
6
5
VREF
COMP
VFB
REGULATING
PULSE WIDTH
MODULATORS
VCC
ISENSE
RT /CT
OUTPUT
GROUND
J Package – 8 Pin Ceramic DIP
N Package – 8 Pin Plastic DIP
D-8 Package – 8 Pin Plastic (150) SOIC
FEATURES
• Guaranteed ±1% reference voltage tolerance
• Guaranteed ±10% frequency tolerance
• Low start–up current (<500 A)
TOP VIEW
14
13
12
11
10
9
1
2
3
4
5
6
7
VREF
COMP
N/C
• Under voltage lockout with hysteresis
N/C
• Output state completely defined for all supply
and input conditions
VFB
VCC
• Interchangeable with UC1842 and UC1843
series for improved operation
N/C
VC
ISENSE
N/C
OUTPUT
GROUND
• 500kHz operation
POWER
GROUND
8
R
T /CT
D-14 Package – 14 Pin Plastic (150) SOIC
Order Information
Part
Number
J–Pack
8 Pin
N–Pack
8 Pin
D–8
8 Pin
D–14
14 Pin
Temp.
Range
Note:
To order, add the package identifier to the
part number.
IP1842
IP2842
IP3842
IP1843
IP2843
IP3843
✔
✔
✔
✔
✔
✔
-55 to +125°C
-25 to +85°C
0 to +70°C
-55 to +125°C
-25 to +85°C
0 to +70°C
✔
✔
✔
✔
✔
✔
eg.
IP1842J
IP3843D-14
✔
✔
✔
✔
✔
✔
ABSOLUTE MAXIMUM RATINGS (T
= 25°C unless otherwise stated)
case
(low impedance source)
V
Supply Voltage
+30V
Self limiting
CC
(I < 30mA)
CC
I
Output Current
±1A
5 J
O
Output Energy
(capacitive load)
(pins 2 and 3)
Analog Inputs
–0.3V to +V
10mA
CC
Error Amp Output Sink Current
Power Dissipation
P
P
T
T
= 25°C
= 25°C
1W
10mW/°C
D
amb
case
Derate @ T
> 50°C
amb
Power Dissipation
Derate @ T > 25°C
2W
24mW/°C
D
case
T
T
Storage Temperature Range
Lead Temperature
–65 to 150°C
+300°C
STG
(soldering, 10 seconds)
L
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00
IP1842 SERIES
IP1843 SERIES
DESCRIPTION
The IP1842 and IP1843 series of switching regulator control circuits contain all the functions necessary to
implement off–line, current mode switching regulators, using a minimum number of external parts. Functions
included are voltage reference, error amplifier, current sense comparator, oscillator, totem pole output driver and
under-voltage lockout circuitry.
Although pin compatible with the UC1842 and 1843 series, SEMELAB has incorporated several improvements in
the IP1842 and IP1843 series allowing tighter and more complete specification of electrical performance.
BLOCK DIAGRAM
7/12
VCC
UNDER–VOLTAGE
LOCKOUT
34V
8/14
ENABLE
5V
REFERENCE
REGULATOR
V
REF
5/9
GND
16V
(8.4V)
INTERNAL
BIAS
6V
(0.5V)
2.5V
REG
VREF STATUS
LATCH
S
R
7/11VC
3.6V
6/10OUTPUT
4/7
RT /CT
OSCILLATOR
ERROR
AMP
S
R
5/8
POWER
GROUND
2R
2/3
1/1
PWM
LATCH
VFB
R
1V
C
OMP
CURRENT
SENSE
COMPARATOR
3/5
ISENSE
PIN NUMBERS
1st Number – N, J and 8 Pin D Packages
2nd Number – 14 Pin D Package.
Values in brackets are for IP1843 series.
RECOMMENDED OPERATING CONDITIONS
1
V
Supply Voltage
Output Current
Analog Inputs
30V
CC
I
0 to ±200mA
–0.3V to 3V
0 to 2mA
O
(pins 2 and 3)
Error Amp Output Sink Current
IP1842 , IP1843
IP2842 , IP2843
IP3842 , IP3843
–55 to 125°C
–25 to 85°C
0 to 70°C
Operating Ambient Temperature Range
Notes:
1.
Lower limit set by under voltage lockout specification.
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00
IP1842 SERIES
IP1843 SERIES
ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)
IP1842/IP1843
IP2842/IP2843
IP3842
IP3843
Typ.
Parameter
Test Conditions
Min.
Typ.
Max.
Min.
Max. Units
REFERENCE SECTION
Output Voltage
Input Regulation
Output Regulation
I
O = 1mA
CC = 12V to 25V
O = 1mA to 20mA
TJ = 25°C
4.95
5.00
6
5.05
20
4.90
5.00
6
5.10
20
V
V
mV
I
6
25
6
25
mV
°C
Temperature Stability
0.2
0.4
0.2
0.4
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
Current
Line, Load, Temp
f = 10Hz to 10kHz
4.90
5.10
4.82
5.18
V
TJ = 25°C
50
5
50
5
V
TJ = 125°C @ 1000Hrs
25
25
mV
VREF = 0
30
47
80
160
30
47
80
160
mA
OSCILLATOR SECTION
Frequency
TJ = 25°C
52
0.2
5
57
1
52
0.2
5
57
1
kHz
%
Voltage stability
Temperature Stability
Amplitude
VCC = 12V to 25V
TA = Min to Max
%
V
PIN4 Peak to Peak
1.7
8.3
8
1.7
8.3
8
V
TJ = 25°C
mA
%
Discharge Current
TA = Min to Max
ERROR AMP SECTION
Input Voltage
V
PIN1 = 2.5V
2.45
2.50
2.55
2.42
2.50
2.58
V
A
Input Bias Current
Open Loop Voltage
Gain
–0.3
–1
–0.3
–2
V
O = 2V to 4V
65
0.7
60
90
1
65
0.7
60
90
1
dB
MHz
dB
Unity Gain Bandwidth
Supply Voltage
Rejection
V
CC = 12V to 25V
70
70
Output Sink Current
Output Source Current
VPIN2 = 2.7V
VPIN2 = 2.3V
VPIN2 = 2.3V
VPIN2 = 2.7V
VPIN1 = 1.1V
VPIN1 = 4.6V
RL = 15k
2
6
2
6
mA
V
–0.5
4.6
–0.8
4.8
0.7
–0.5
4.6
–0.8
4.8
0.7
V
OUT High
OUT Low
V
RL = 15k
1.1
1.1
NOTES
1. Test Conditions unless otherwise stated:
CC = 15V* , RT = 10k , CT = 3.3nF , f = 52kHz.
V
*Adjust VCC above start threshold before setting at required level.
All specifications apply over the full operating temperature range
unless otherwise stated. (See Ordering Information for further details).
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00
IP1842 SERIES
IP1843 SERIES
ELECTRICAL CHARACTERISTICS (Over Full Operating Temperature Range unless otherwise stated)
IP1842/IP1843
IP2842/IP2843
IP3842
IP3843
Typ.
Parameter
Test Conditions
Min.
Typ.
Max.
Min.
Max. Units
CURRENT SENSE SECTION
Gain
See Notes 2,3
2.85
0.9
3
1
3.15
1.1
2.85
0.9
3
1
3.15
1.1
V/V
V
Maximum Input Signal
Supply Voltage
Rejection
VPIN1 = 4.6V
(Note 2)
VC = 12V to 25V
60
70
60
70
dB
Input Bias Current
Delay to Output
–2
–10
–2
–10
A
200
400
200
400
ns
OUTPUT SECTION
I
I
I
I
SINK = 20mA
0.1
1.5
13.5
13.5
50
0.4
2.2
0.1
1.5
13.5
13.5
50
0.4
2.2
Output Low Level
Output High Level
V
V
SINK = 200mA
SOURCE = 20mA
SOURCE = 200mA
13
12
13
12
Rise Time
CL = 1nF
CL = 1nF
TJ = 25°C
TJ = 25°C
IL = 1mA
150
150
1.1
150
150
1.1
ns
V
Fall Time
50
50
UVLO Saturation
VCC = 6V
0.7
0.7
UNDER–VOLTAGE LOCKOUT SECTION
Upper Threshold
1842 Series
15
7.8
9
16
8.4
10
17
9
14.5
7.8
8.5
7
16
8.4
10
17.5
9
V
V
(VCC
Lower Threshold
(VCC
)
1843 Series
1842 Series
11
8.2
11.5
8.2
)
1843 Series
7
7.6
7.6
TOTAL STANDBY CURRENT
Start–up Current
Operating Supply
Current
0.3
11
14
34
0.5
15
17
40
0.3
11
14
34
0.5
15
17
40
mA
mA
V
V
PIN2 = 0V
PIN3 = 0V
1842 Series
1843 Series
V
VCC Zener Voltage
ICC = 25mA
30
30
NOTES
1. Test Conditions unless otherwise stated:
CC = 15V* , RT = 10k , CT = 3.3nF , f = 52kHz.
2. Parameter measured at trip point of latch with
V
V
= 0V
PIN2
*Adjust VCC above start threshold before setting at
required level.
3. Gain defined as:
V
V
PIN1
A =
0
PIN3
V
0.8
All specifications apply over the full operating temperature
range unless otherwise stated.
PIN3
(See Ordering Information for further details).
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00
IP1842 SERIES
IP1843 SERIES
APPLICATIONS INFORMATION
Oscillator Waveforms and Maximum Duty Cycle
1
2
3
4
8
7
6
5
VREF
COMP
VFB
VCC
ISENSE
RT /CT
OUTPUT
GROUND
Oscillator timing capacitor C is charged by V
t
t
0.55 RTCT
For RT > 5k ,
T
REF
c
through R and discharged by an internal current source.
T
.0063 R – 2.3
.0063 – 4
1.8
Resultant frequency f
(RTCT)
T
During the discharge time, the internal clock signal
RTCT Rn
d
(
)
blanks the output to the low state. Selection of R and
T
1
C
therefore determines both oscillator frequency and
Resultant frequency f =
T
(t + t )
c
d
maximum duty cycle. Charge and discharge times are
determined by the formulae:
Open–Loop Laboratory Test Fixture
14
13
12
11
10
9
1
2
3
4
5
6
7
VREF
COMP
N/C
N/C
VFB
VCC
N/C
VC
ISENSE
N/C
OUTPUT
GROUND
POWER
GROUND
8
R
T /CT
High peak current associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should
be connected close to pin 5 in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator wave
form and apply an adjustable ramp to pin 3.
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
Prelim.3/00
E-mail: sales@semelab.co.uk
Website: http://www.semelab.co.uk
IP1842 SERIES
IP1843 SERIES
TYPICAL PERFORMANCE CHARACTERISTICS
1
2
3
4
8
7
6
5
VREF
COMP
VFB
VCC
ISENSE
RT /CT
OUTPUT
GROUND
14
13
12
11
10
9
1
2
3
4
5
6
7
VREF
COMP
N/C
N/C
VFB
VCC
N/C
VC
ISENSE
N/C
OUTPUT
GROUND
POWER
GROUND
8
R
T /CT
Semelab plc. Telephone +44(0)1455 556565. Fax +44(0)1455 552612.
E-mail: sales@semelab.co.uk Website: http://www.semelab.co.uk
Prelim.3/00
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