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參數資料
| 型號： | TC170 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CMOS Current Mode PWM Controller |
| 中文描述： | CMOS電流模式PWM控制器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 104K |
| 代理商： | TC170 |
4-119
TELCOM SEMICONDUCTOR, INC.
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TC170
CMOS CURRENT MODE PWM CONTROLLER
FEATURES
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Low Supply Current With
CMOS Technology................................. 3.8mA Max
Internal Reference .............................................5.1V
Fast Rise/Fall Times (C
L
= 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 to16V
High Frequency Operation ..........................200kHz
Available with Low OFF State Outputs
Low Power, Pin-Compatible Replacement for UC3846
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ORDERING INFORMATION
Temperature
Range
0
°
C to +70
°
C
Part No.
Package
TC170COE
TC170CPE
16-Pin SOIC (Wide)
16-Pin Plastic DIP (Narrow) 0
°
C to +70
°
C
GENERAL DESCRIPTION
The TC170 brings low-power CMOS technology to the
current-mode-switching power supply controller market.
Maximum supply current is 3.8 mA. 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).
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 compo-
nent count. The TC170 is pin compatible with the Unitrode
UC1846/2846/3846 bipolar controller.
Other advantages inherent in current-mode control in-
clude superior line and load regulation and automatic sym-
metry correction in push-pull converters.
+
–
R5.1-VOLT
OSCILLATOR
A3.15 CURRENT
–
PWM
POSITIVE
15
9
10
3
4
7
5
8
6
VIN
SYNC
(–) CURRENT
SENSE INPUT
(+) CURRENT
SENSE INPUT
COMP
(+) ERROR
AMP INPUT
(–) ERROR
AMP INPUT
ERROR
100μA
0.75V
LIMIT BUFFER
Q4
350mV
LOCK-UP
Q3
Q1
Q2
3.5k
SHUTDOWN
350
6k
SHUTDOWN
CURRENT LIMIT/
Outputs low in
NOTE:
16
1
S
S
R
Q
C
D Q
Q
GROUND
VDD
OUTPUT
A ( )
12
14
11
13
PWM LATCH
TC170
VREF
2
+
RO
CO
VDD
+
–
–
+
+
–
+
–
+
–
UNLOCKOUT
OUTPUT
B ( )
TC170-5 10/1/96
FUNCTIONAL BLOCK DIAGRAM
相關PDF資料 |
PDF描述 |
|---|---|
| TC170CPE | CMOS Current Mode PWM Controller |
| TC170COE | CMOS Current Mode PWM Controller |
| TC170CPE | CMOS CURRENT MODE PWM CONTROLLER |
| TC170COE | CMOS CURRENT MODE PWM CONTROLLER |
| TC18C46 | CMOS CURRENT MODE PWM CONTROLLER |
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| TC170COE | 制造商:TELCOM 制造商全稱:TelCom Semiconductor, Inc 功能描述:CMOS CURRENT MODE PWM CONTROLLER |
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