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TC28C43EPD Folha de dados(PDF) 1 Page - TelCom Semiconductor, Inc

Nome de Peças TC28C43EPD
Descrição Electrónicos  BiCMOS CURRENT MODE PWM CONTROLLERS
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Fabricante Electrônico  TELCOM [TelCom Semiconductor, Inc]
Página de início  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC28C43EPD Folha de dados(HTML) 1 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
BiCMOS CURRENT MODE PWM CONTROLLERS
UNDER VOLTAGE
SECTION
VREF
OSC
12
9
5
3
1
2R
ERROR AMP
LIMIT BUFFER
R
CLK
PWM COMPARATOR
2.5V
1.4V
UV GOOD
14
VREF
7
R/
T CT
VDD
11
OUTPUT
10
PIN NUMBERS FOR
14-PIN DIP
COMP
VFB
2.5V
SENSE
ANALOG
GND
VIN
CLK
0.4V
+
+
+
S
R
POWER
GROUND
8
Q
1.4V
+
TC38C43-7 10/21/96
FEATURES
s
Low Power BiCMOS Design
s
Tough CMOSTM Construction
s
Low Supply Current ............. 1.0mA Typ @ 100kHz
s
Wide Supply Voltage Operation .............. 8V to 15V
s
Latch-Up Immunity ................... 500mA on Outputs
s
Input Will Withstand Negative Inputs to – 5 Volts
s
High Output Drive .................................... 0.7A Peak
(1.2A on 14-Pin and 16-Pin Versions)
s
2 kV ESD Protection
s
Current Mode Control
s
Fast Rise/Fall Time (Max) ........... 60nsec @ 1000pF
s
High Frequency Operation ..........................500kHz
s
Clock Ramp Reset Current ................. 2.5mA
±10%
s
Low Propagation Delay Current Amp
to Output ............................................ 140nsec Typ.
s
Pin Compatible with UC3843
ORDERING INFORMATION
Part No.
Package
Temperature
TC18C43MJA
8-Pin CerDIP
– 55
°C to +125°C
TC18C43MJD
14-Pin CerDIP
– 55
°C to +125°C
TC28C43EOE
16-Pin SOIC (Wide)
– 40
°C to +85°C
TC28C43EPA
8-Pin Plastic DIP
– 40
°C to +85°C
TC28C43EPD
14-Pin Plastic DIP
– 40
°C to +85°C
TC38C43COE
16-Pin SOIC (Wide)
0
°C to +70°C
TC38C43CPA
8-Pin Plastic DIP
0
°C to +70°C
TC38C43CPD
14-Pin Plastic DIP
0
°C to +70°C
GENERAL DESCRIPTION
The TC38C43 is a current mode BiCMOS PWM control
IC. With a low 1.0 mA supply current along with high drive
current (0.7A peak) it provides a low cost solution for a PWM
that operates to 500 kHz and directly drives MOSFETs up to
HEX 3 size.
Performance of the oscillator and current sense ampli-
fier have been greatly improved over previous bipolar ver-
sions. Voltage and temperature stability have been im-
proved by a factor of 3. Noise immunity (PSRR) has also
been improved.
The TC38C43 is pin compatible with the earlier bipolar
version so that designers can easily update older designs.
Improvements have been added, though. For example,
clock ramp reset current is specified at 2.5mA (
±10%) for
accurate dead time control. A few component values must
be changed (RT & CT) to use the TC38C43 in existing bipolar
designs.
The 14-pin DIP and 16-pin SOIC versions have sepa-
rate and internally isolated grounds, and are rated for higher
output current (1.2A). These separate grounds allow for
‘bootstrap’ operation of the PWM to further improve effi-
ciency.
FUNCTIONAL BLOCK DIAGRAM
1
2
3
4
8
7
6
5
VREF
CMPTR
OUTPUT
ISENSE
VIN
GND
RT/CT
VFB
TC18CMJA
TC28CEPA
TC38CCPA
NC
NC
NC
OUTPUT
POWER
GND
GND
NC
VREF
VIN
RT/CT
ISENSE
CMPTR
VDD
VFB
114
213
312
411
510
69
78
1
2
3
4
16
15
14
13
9
8
NC
NC
NC
NC
OUTPUT
POWER
GND
GND
NC
VREF
VIN
CMPTR
VDD
VFB
TC18CMJD
TC28CEPD
TC38CCPD
12
11
10
5
6
7
NC
RT/CT
ISENSE
TC28CCOE
TC38CEOE
14-Pin Plastic DIP
16-Pin SOIC (Wide)
8-Pin Plastic DIP
PIN CONFIGURATIONS
TC18C43
TC28C43
TC38C43


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