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TC18C46 Datasheet Preview

TC18C46 Datasheet

CMOS CURRENT MODE PWM CONTROLLER

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TC18C46 pdf
1TC18C46
TC28C46
TC38C46
CMOS CURRENT MODE PWM CONTROLLER
FEATURES
GENERAL DESCRIPTION
s Isolated Output Drive
s Low Power CMOS Construction
s Low Supply Current ................................. 2mA Typ.
s Wide Supply Voltage Operation .............. 8V to 18V
s Latch-Up Immunity ................... 500mA on Outputs
s Above and Below Rail Input Protection ............. 6V
s High Output Drive ................................ 500mA Peak
s Current Mode Control
s Fast Rise/Fall Time ..................... 50nsec @ 1000pF
s High Frequency Operation .......................... 500kHz
s UV Hysteresis Guaranteed
s Programmable Current Limit
s Shutdown Pin Available
s Double Ended
s Soft Start
s Low Prop Delay Current Amp
to Output ......................................... < 350nsec Typ.
s Low Prop Delay Shutdown
to Output ......................................... < 400nsec Typ.
s TC38C46Pin Compatible with Unitrode UC3846
s ESD Protected ................................................. ±2 kV
FUNCTIONAL BLOCK DIAGRAM
The TC38C46 is a current mode CMOS PWM control
IC. It draws only 2 mA supply current, so it can be driven
without a costly 50-60 Hz transformer. The output drive
stage is capable of high drive currents, 300mA typical.
The TC38C46 is pin compatible with earlier bipolar
products so that designers can easily update older designs.
A number of improvements have been added.
This second generation part has been designed with an
isolated drive stage. Unlike its cousin, the TC170, the output
stage of the TC38C46 can be run from a separate power
supply such as a secondary winding on an output trans-
former. This allows for bootstrap start-up of the power
supply.
ORDERING INFORMATION
Part No.
TC18C46MJE
TC28C46EOE
TC28C46EPE
TC38C46COE
TC38C46CPE
Configuration
Pkg./Temperature
Non-Inverting
Non-Inverting
Non-Inverting
Non-Inverting
Non-Inverting
16-Pin CerDIP
– 55°C to +125°C
16-Pin SOIC (Wide)
– 40 °C to +85°C
16-Pin Plastic DIP (Narrow)
– 40°C to +85°C
16-Pin SOIC (Wide)
0°C to +70°C
16-Pin Plastic DIP (Narrow)
0°C to +70°C
VREF
2
VIN 15
RT 9
CT 8
SYNC 10
– CURRENT
SENSE INPUT
+ CURRENT
SENSE INPUT
COMPENSATION
3
4
7
+ ERROR
AMP INPUT
– ERROR
AMP INPUT
5
6
5.1 VOLT
REFERENCE
OSCILLATOR
UNDER VOLTAGE
LOCKOUT
DQ
CURRENT SENSE
AMPLIFIER
PWM
– .65V COMPARATOR
x3
+
–+ +
R
Q
S
S
PWM LATCH
CQ
+VS+
+ 100µA
ERROR
AMPLIFIER
LIMIT BUFFER
AMPLIFIER
+
Q4
350mV
Q1
+
LOCK-UP
AMPLIFIER
POSITIVE
FEEDBACK
Q3
Q2
SHUTDOWN
COMPARATOR
+
– 350mV
6k
TC18C46
TC28C46
TC38C46
3.5k
13 VDD
11 OUTPUT A
14 OUTPUT B
12 GROUND
1 CURRENT LIMIT
SOFT START ADJUST
16 SHUTDOWN
TC38C46 OUTPUTS
LOW IN OFF STATE
2
3
4
5
6
7
8
TELCOM SEMICONDUCTOR, INC.
TC18/28/28/C46-8 9/23/96
4-101
Free Datasheet http://www.datasheet4u.com/



TelCom
TelCom

TC18C46 Datasheet Preview

TC18C46 Datasheet

CMOS CURRENT MODE PWM CONTROLLER

No Preview Available !

TC18C46 pdf
TC18C46
TC28C46
TC38C46
CMOS CURRENT MODE
PWM CONTROLLERS
ABSOLUTE MAXIMUM RATINGS
Output Current, Source or Sink (Pins 1, 14) ..........500mA
Analog Inputs (Pins 3, 4, 5, 6, 16) .............. – 0.3V to +VIN
Reference Output Current (Pin 2) ........................ – 30 mA
Sync Output Current (Pin 10) .................................. – 5mA
Error Amplifier Output Current (Pin 7) ..................... – 5mA
Soft Start Sink Current (Pin 1) .................................. 50mA
Oscillator Charging Current (Pin 9) ............................5mA
Supply Voltage ............................................................18V
Maximum Chip Temperature ................................... 150°C
Storage Temperature ............................ – 65°C to +150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
Package Thermal Resistance
CerDIP RθJ-A ................................................................. 150°C/W
CerDIP RθJ-C ................................................................... 55°C/W
PDIP RθJ-A ..................................................................... 125°C/W
PDIP RθJ-C ........................................................................ 45°C/W
SOIC RθJ-A ..................................................................... 250°C/W
SOIC RθJ-C ....................................................................... 75°C/W
NOTES:
1. All voltages are with respect to Ground, Pin 12. Currents are positive into,
negative out of the specified terminal.
2. Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. Stresses
above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions above those
indicated in the operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.
PIN CONFIGURATIONS
16-Pin Plastic DIP (Narrow)
16-Pin CerDIP
CURRENT LIMIT/
SOFT START
VREF
– CURRENT SENSE
1
2
3
+ CURRENT SENSE 4
+ ERROR AMP 5
– ERROR AMP 6
COMP 7
CT 8
TC18C46MJE
TC28C46EPE
TC38C46CPE
16 SHDN
15 VIN
14 OUTPUT B
13 VDD
12 GND
11 OUTPUT A
10 SYNC
9 RT
CURRENT LIMIT/
SOFT START
VREF
– CURRENT SENSE
+ CURRENT SENSE
+ ERROR AMP
– ERROR AMP
COMP
CT
16-Pin SOIC (Wide)
1 16 SHDN
2 15 VIN
3 14 OUTPUT B
4
TC28C46EOE
TC38C46COE
13 VDD
5 12 GND
6 11 OUTPUT A
7 10 SYNC
8 9 RT
4-102
TELCOM SEMICONDUCTOR, INC.
Free Datasheet http://www.datasheet4u.com/


Part Number TC18C46
Description CMOS CURRENT MODE PWM CONTROLLER
Maker TelCom
Total Page 10 Pages
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