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TC170 Datasheet(PDF) 1 Page - Microchip Technology

Part No. TC170
Description  CMOS Current Mode PWM Controller
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Maker  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC170 Datasheet(HTML) 1 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21395B-page 1
TC170
Features
• Low Supply Current With CMOS Technology:
3.8mA Max
• Internal Reference: 5.1V
• Fast Rise/Fall Times (CL = 1000pF): 50nsec
• Dual Push-Pull Outputs
•Direct-Power MOSFET Drive
• High Totem-Pole Output Drive: 300mA
• Differential Current-Sense Amplifier
• Programmable Current Limit
• Soft-Start Operation
• Double-Pulse Suppression
• Undervoltage Lockout
• Wide Supply Voltage Operation: 8V to 16V
• High Frequency Operation: 200kHz
• Available with Low OFF State Outputs
• Low Power, Pin-Compatible Replacement for
UC3846
Applications
• Switching Power Supplies
• DC/DC Converters
• Motor Control
Device Selection Table
General Description
The TC170 offers maximum supply current of 3.8mA.
Bipolar current-mode control integrated circuits require
five times more operating current.
The dual totem-pole CMOS outputs drive power
MOSFETs or bipolar transistors. The 50nsec typical
output rise and fall times (1000pF capacitive loads)
minimize MOSFET power dissipation. Output peak
current is 300mA.
The TC170 contains a full array of system-protection
circuits (see Features Section).
Current-mode control lets users parallel power supply
modules. Two or more TC170 controllers can be slaved
together for parallel operation. Circuits can operate
from a master TC170 internal oscillator or an external
system oscillator.
The TC170 operates from an 8V to 16V power supply.
An internal 2%, 5.1V reference minimizes external
component count. The TC170 is pin compatible with
the
Unitrode
UC1846/UC2846/UC3846
bipolar
controller.
Other advantages inherent in current-mode control
include superior line and load regulation and automatic
symmetry correction in push-pull converters.
Package Type
Part Number
Package
Temp. Range
TC170COE
16-Pin SOIC (Wide)
0°C to +70°C
TC170CPE
16-Pin PDIP (Narrow)
0°C to +70°C
TC170CPE
SHDN
DD
SOFT START/
ILIM
VREFOUT
– I SENSE IN
+ I SENSE IN
+ ERROR AMP IN
CMPTR
RO
– ERROR AMP IN
NOTE: Outputs LOW in "OFF" state.
IN
CO
1
2
3
4
16
15
5
6
7
9
8
1
2
3
4
15
16
14
13
5
6
7
12
11
10
9
8
TC170COE
SOFT START/
ILIM
VREFOUT
– I SENSE IN
+ I SENSE IN
+ ERROR AMP IN
CMPTR
– ERROR AMP IN
CO
SHDN
VDD
OUTPUT B
GND
OUTPUT A
SYNC
RO
VIN
16-Pin SOIC (Wide)
16-Pin PDIP (Narrow)
CMOS Current Mode PWM Controller


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