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PDF TC170 Data sheet ( Hoja de datos )
| Número de pieza | TC170 | |
| Descripción | CMOS Current Mode PWM Controller | |
| Fabricantes | Microchip | |
| Logotipo |  |
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TC170
CMOS Current Mode PWM Controller
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
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
Package Type
16-Pin PDIP (Narrow)
SOFT START/
ILIM 1
VREFOUT 2
– I SENSE IN 3
16 SHDN
15 IN
+ I SENSE IN 4
TC170CPE
+ ERROR AMP IN 5
DD
– ERROR AMP IN 6
CMPTR 7
CO 8
9 RO
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.
16-Pin SOIC (Wide)
SOFT START/
ILIM
VREFOUT
– I SENSE IN
+ I SENSE IN
+ ERROR AMP IN
1 16
2 15
3 14
4 13
TC170COE
5 12
SHDN
VIN
OUTPUT B
VDD
GND
– ERROR AMP IN
CMPTR
6
7
11 OUTPUT A
10 SYNC
CO 8
9 RO
NOTE: Outputs LOW in "OFF" state.
© 2002 Microchip Technology Inc.
DS21395B-page 1
1 page  
TC170
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(16-Pin PDIP,
SOIC)
Symbol
Description
1 SOFT START/ILIM Soft Start Adjust/Current Limit. For setting the peak current threshold of sense inputs (pins 3
and 4). Second function of this pin is Soft-Start Adjust.
2
VREFOUT
Reference supply output of 5.1 volts. It can supply a minimum of 10mA.
3
-ISENSEIN
-Current Sense Input. Inverting input for sensing peak current of the pass transistor through
series sense current monitor resistor.
4
+ISENSEIN
+Current Sense Input. Non-inverting input used in conjunction with pin 3. This senses the
positive end of current monitor resistor.
5 +ERROR AMP IN +Error Amp In. Non-inverting input for output voltage regulation.
6 -ERROR AMP IN -Error Amp In. Inverting input of the amplifier for the reference voltage.
7
CMPTR
For compensation of the feedback loop response.
8 CO Timing capacitor (CO) input to set oscillator frequency in conjunction with pin 9, RO, resistor
input. Second function is for setting crossover dead time of pin 11and 14 outputs.
9 RO Timing resistor (RO) input to set oscillator frequency by setting constant current charge rate to
charge capacitor CO.
10
SYNC
For PWM controller oscillator synchronization of two or more controllers. Or as a clock input to
sync oscillator from external signal.
11 OUTPUT A A output drive of phase A from push pull transistors.
12
GND
Ground return for all input and output pins.
13 VDD Supplies power to operate the output drivers only.
14 OUTPUT B Output of phase B from push pull transistors.
15 VIN Voltage bias supply for all TC170 circuits except the output transistors.
16
SHDN
Input pin to disable both output drives to 0V OFF.
© 2002 Microchip Technology Inc.
DS21395B-page 5
5 Page 
TC170
5.0 PACKAGING INFORMATION
5.1 Package Marking Information
Package marking data not available at this time.
5.2 Taping Form
Component Taping Orientation for 16-Pin SOIC (Wide) Devices
User Direction of Feed
PIN 1
W
P
Standard Reel Component Orientation
for TR Suffix Device
Carrier Tape, Number of Components Per Reel and Reel Size
Package
16-Pin SOIC (W)
Carrier Width (W)
16 mm
Pitch (P)
12 mm
Part Per Full Reel
1000
Reel Size
13 in
© 2002 Microchip Technology Inc.
DS21395B-page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TC170.PDF ] | |
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