IP3845N Semelab-Plc-, IP3845N Datasheet

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IP3845N

Manufacturer Part Number
IP3845N
Description
Current Mode Regulating Pulse Width Modulator
Manufacturer
Semelab-Plc-
Datasheet
1.IP3845N.pdf (6 pages)

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
IP3845N
Manufacturer:
SML
Quantity:
5 510
Company:
Bonase Electronics (HK) Co., Limited Bonase Electronics (HK) Co., Limited
Part Number:
IP3845N
Manufacturer:
FUJ
Quantity:
5 510
LAB
ABSOLUTE MAXIMUM RATINGS
V
I
P
P
P
T
T
Semelab plc.
SEME
Part
Number
IP1844
IP2844
IP3844
IP1845
IP2845
IP3845
O
STG
L
CC
D
D
D
D-14 Package – 14 Pin Plastic (150) SOIC
D-8 Package – 8 Pin Plastic (150) SOIC
N Package – 8 Pin Plastic DIP
J Package – 8 Pin Ceramic DIP
J–Pack
COMP
COMP
Supply Voltage
Output Current
Output Energy
Analog Inputs
Error Amp Output Sink Current
Power Dissipation
Derate @ T
Power Dissipation
Derate @ T
Power Dissipation
Derate @ T
Storage Temperature Range
Lead Temperature
I
R
I
R
SENSE
SENSE
8 Pin
T
T
N/C
N/C
N/C
V
V
/C
/C
Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.
FB
FB
T
T
1
2
3
4
1
2
3
4
5
6
7
TOP VIEW
TOP VIEW
N–Pack
amb
amb
case
8 Pin
> 50°C
> 50°C
> 25°C
14
13
12
11
10
8
7
6
5
9
8
V
V
OUTPUT
GROUND
V
N/C
V
V
OUTPUT
GROUND
POWER
GROUND
REF
CC
REF
CC
C
8 Pin
D–8
(low impedance source)
(I
(capacitive load)
(pins 2 and 3)
T
T
T
(soldering, 10 seconds)
Order Information
(T
CC
amb
case
case
14 Pin
D–14
case
< 30mA)
= 25°C
= 25°C
= 25°C
= 25°C unless otherwise stated)
-55 to +125°C
-55 to +125°C
-25 to +85°C
-25 to +85°C
FEATURES
• Guaranteed ±1% reference voltage tolerance
• Guaranteed ±10% frequency tolerance
• Low start–up current (<500 m A)
• Under voltage lockout with hysteresis
• Output state completely defined for all supply
• Interchangeable with UC1844 and UC1845
• 500kHz Oscillator operation
0 to +70°C
0 to +70°C
and input conditions
series for improved operation
250kHz Output operation
Range
Temp.
J, N Packages
J, N Packages
D Package
CURRENT MODE
MODULATORS
Note:
To order, add the package identifier to the
part number.
eg.
PULSE WIDTH
REGULATING
IP1844D–14
IP3845J
IP1844 SERIES
IP1845 SERIES
–0.3V to +V
–65 to 150°C
7.25mW/°C
Self limiting
10mW/°C
16mW/°C
725mW
+300°C
10mA
+30V
±1A
5 J
1W
2W
CC
Prelim. 2/95

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IP3845N Summary of contents

Page 1

SEME LAB TOP VIEW COMP SENSE Package – 8 Pin Ceramic DIP N Package – 8 Pin Plastic DIP D-8 Package – 8 Pin Plastic (150) SOIC TOP ...

Page 2

SEME LAB DESCRIPTION The IP1844 and IP1845 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 ...

Page 3

SEME LAB ELECTRICAL CHARACTERISTICS Parameter Test Conditions REFERENCE SECTION Output Voltage I = 1mA O Input Regulation V = 12V to 25V CC Output Regulation I = 1mA to 20mA O Temperature Stability Total Output Variation Line, Load, Temp Output ...

Page 4

SEME LAB ELECTRICAL CHARACTERISTICS Parameter Test Conditions CURRENT SENSE SECTION Gain See Notes 2,3 Maximum Input Signal V = 5.0V PIN1 Supply Voltage V = 12V to 25V C Rejection Input Bias Current Delay to Output OUTPUT SECTION I = ...

Page 5

SEME LAB V 8 REF GND 5 Oscillator timing capacitor C internal current source. During the discharge time, the internal clock signal blanks the output to the low state. Selection of ...

Page 6

SEME LAB 4.7k 1k ERROR AMP ADJUST 4.7k High peak current associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin single point ground. The transistor and 5K potentiometer ...

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