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TC170CPE 参数 Datasheet PDF下载

TC170CPE图片预览
型号: TC170CPE
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS电流模式PWM控制器 [CMOS CURRENT MODE PWM CONTROLLER]
分类和应用: 开关光电二极管控制器
文件页数/大小: 8 页 / 106 K
品牌: TELCOM [ TELCOM SEMICONDUCTOR, INC ]
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1
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
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.
2
3
4
5
6
7
ORDERING INFORMATION
Part No.
TC170COE
TC170CPE
Package
Temperature
Range
16-Pin SOIC (Wide)
0°C to +70°C
16-Pin Plastic DIP (Narrow) 0°C to +70°C
FUNCTIONAL BLOCK DIAGRAM
VREF
2
VIN
RO
CO
SYNC
(–) CURRENT
SENSE INPUT
(+) CURRENT
SENSE INPUT
COMP
(+) ERROR
AMP INPUT
(–) ERROR
AMP INPUT
15
5.1-VOLT
REFERENCE
TC170
9
8
10
3
4
7
VDD
5
6
+
ERROR
AMPLIFIER
350mV
LOCK-UP
AMPLIFIER
Q1
+
POSITIVE
FEEDBACK
3.5k
Q2
100µA
+
×
3.15 CURRENT
AMPLIFIER
+
0.75V
PWM
COMPARATOR
S
S
LIMIT BUFFER
AMPLIFIER
+
Q4
SHUTDOWN
COMPARATOR
16
+
350
mV
6k
Q3
SHUTDOWN
PWM LATCH
1
R
Q
OSCILLATOR
UNDERVOLTAGE
LOCKOUT
D Q
C
Q
14
12
OUTPUT
B(
)
GROUND
11
13
VDD
OUTPUT
A(
)
+
CURRENT LIMIT/
SOFT-START ADJUST
NOTE:
Outputs low in
OFF state.
8
TC170-5 10/1/96
TELCOM SEMICONDUCTOR, INC.
4-119