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PDF TC170 Data sheet ( Hoja de datos )
| Número de pieza | TC170 | |
| Descripción | CMOS CURRENT MODE PWM CONTROLLER | |
| Fabricantes | TelCom | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC170 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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1
TC170
CMOS CURRENT MODE PWM CONTROLLER
FEATURES
s Low Supply Current With
CMOS Technology ................................. 3.8mA Max
s Internal Reference ............................................. 5.1V
s Fast Rise/Fall Times (CL = 1000pF) ............. 50nsec
s Dual Push-Pull Outputs
s Direct-Power MOSFET Drive
s High Totem-Pole Output Drive .................... 300mA
s Differential Current-Sense Amplifier
s Programmable Current Limit
s Soft-Start Operation
s Double-Pulse Suppression
s Undervoltage Lockout
s Wide Supply Voltage Operation ............... 8V to16V
s High Frequency Operation .......................... 200kHz
s Available with Low OFF State Outputs
s Low Power, Pin-Compatible Replacement for UC3846
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
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
FUNCTIONAL BLOCK DIAGRAM
VREF
2
VIN 15
RO 9
CO 8
10
SYNC
(–) CURRENT
SENSE INPUT
(+) CURRENT
SENSE INPUT
COMP
3
4
7
(+) ERROR
AMP INPUT
(–) ERROR
AMP INPUT
5
6
OSCILLATOR
5.1-VOLT
REFERENCE
UNDERVOLTAGE
LOCKOUT
TC170
13 VDD
11
OUTPUT
A( )
–
× 3.15 CURRENT
AMPLIFIER
PWM
–+
COMPARATOR
+
+ 0.75V
–
VDD
100µA
+
LIMIT BUFFER
AMPLIFIER
+
R
Q
S
DQ
C
Q
S
PWM LATCH
– – Q4
ERROR
AMPLIFIER
350mV
LOCK-UP
AMPLIFIER
Q3
–
+
POSITIVE
FEEDBACK
Q1 Q2
3.5k Ω
SHUTDOWN
COMPARATOR
+
– 350
mV
6k Ω
14 OUTPUT
B( )
12
GROUND
1 CURRENT LIMIT/
SOFT-START ADJUST
16
SHUTDOWN
NOTE: Outputs low in
OFF state.
TELCOM SEMICONDUCTOR, INC.
6
7
TC170-5 10/1/96
4-119
8
1 page  
CMOS CURRENT MODE
PWM CONTROLLER
1
TC170
SWITCH
CURRENT
× 3.15 CURRENT-SENSE
AMPLIFIER
4
3
RS
+
–
–+
0.75V
PWM COMPARATOR
+
–
7
VDD
ERROR
AMPLIFIER
100 µA
FROM
UNDERVOLTAGE
LOCKOUT
Q4
5+
6–
V1 +
LIMIT –
BUFFER
AMPLIFIER
Q3
350mV
TC170
LOCK-UP
AMPLIFIER
–
+ POSITIVE
FEEDBACK
Q1
Q2
I L 3.5k
210
R
SQ
"A" = 1
OUTPUT
OFF (LOW)
S PWM LATCH
VREF
5.1V
2
R1
1 V1
R2
SHUTDOWN
COMPARATOR
+
–
350mV
16
6k
3
4
5
Figure 1. R1 and R2 Set Maximum Peak Output Current
× 3.15 CURRENT-
SENSE
AMPLIFIER
+
–
TC170
4 R*
C
3
*OPTIONAL RC FILTER
(A) Ground Reference
I
RS
I
× 3.15 CURRENT-
SENSE AMPLIFIER
RS
+
TC170
–
4
3
(B) Above-Ground Resistive Sensing
Figure 2. Resistive Sensing
TELCOM SEMICONDUCTOR, INC.
6
VOUT
7
8
4-123
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TC170.PDF ] | |
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