TC25C25 Datasheet, PDF (1/7 Pages) TelCom Semiconductor, Inc – BICMOS PWM CONTROLLERS

1
TC25C25
TC35C25
BICMOS PWM CONTROLLERS
FEATURES
s Low Power BICMOS Construction
s Low Supply Current at 20 kHz ............... 1.0mA Typ
s Latch-Up Immunity ................. >500mA on Outputs
s Below Rail Input Protection .............................. – 5V
s High Output Drive ................................ 500mA Peak
s Fast Rise/Fall Time ..................... 50nsec @ 1000pF
s High Frequency Operation .................. Up to 1MHz
s Tri-state Sync Pin for Easy Parallel Operation
s Under Voltage Hysteresis Guaranteed
s Shutdown Pin Available
s Double-Ended
s Soft Start, With Small Cap
s Low Prop Delay Shutdown to
Output ................................................. 140nsec Typ.
ORDERING INFORMATION
Part No.
TC25C25EOE
TC25C25EPE
TC35C25COE
TC35C25CPE
Configuration Pkg./Temperature
Non-Inverting 16-Pin SOIC (Wide)
– 40°C to +85°C
Non-Inverting 16-Pin Plastic DIP (Narrow)
– 40°C to +85°C
Non-Inverting 16-Pin SOIC (Wide)
0°C to +70°C
Non-Inverting 16-Pin Plastic DIP (Narrow)
0°C to +70°C
GENERAL DESCRIPTION
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The TC35C25 family of PWM controllers are CMOS
implementations of the industry standard 3525 voltage
mode SMPS ICs.
These second generation CMOS devices employ
TelCom Semiconductors' Tough BiCMOS™ process for
3 ^{latch-up proof operation. They offer much lower power}
consumption than any of their previous CMOS or bipolar
counterparts.
These controllers have separate supply pins for the
control and output sections of the circuit. This allows "boot-
strap" operation. The CMOS output stage allows the output
voltage to swing to within 25mV of either rail.
Other improved features include tighter hysteresis and
4 ^{undervoltage start-up specifications over temperature, and}
very low input bias current on all inputs.
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FUNCTIONAL BLOCK DIAGRAM
VREF ¹⁶
VI+N ¹⁵
GND ¹²
SYNC ³
RT ⁶
CT ⁵
DISCH ⁷
UNDER
VOLTAGE
REFERENCE
REGULATOR
+4V REF
OSC OUT
4
+6V
OSC
FLIP
FLOP
COMP ⁹
IN– ¹
IN+ ²
ERROR
AMP
SOFT ⁸
START
SHUTDOWN ¹⁰
CMPTR
+6V
50µA
R
S
PWM
LATCH
R
TELCOM SEMICONDUCTOR, INC.
35C25
13
VDD
11
A
14
B
6
7
8
TC25/35C25-2 10/1/96
4-111