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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | TC170 |
4-121
TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
ELECTRICAL CHARACTERISTICS (Cont.):
V
IN
= 16V, R
O
= 24k
, C
O
= 1nF, T
A
= 25
°
C, unless otherwise indicated.
Symbol
Output Stage
(Cont.)
V
OH
V
OL
t
R
t
F
Undervoltage Lockout
Parameter
Test Conditions
Min
Typ
Max
Unit
Output High Level
Output High Level
Output Rise Time
Output Fall Time
I
SOURCE
= 20mA
I
SOURCE
= 100mA
C
L
= 1000pF
C
L
= 1000pF
V
DD
– 1V
V
DD
– 4V
V
V
nsec
nsec
50
50
150
150
Start-Up
Threshold Hysteresis
Threshold
7.15
0.5
7.7
0.75
8.25
1
V
V
Supply
I
S
Standby Supply Current
2.7
3.8
mA
Pin No.
(16-Pin PDIP)
Symbol
Description
1
SOFT START/I
LIM
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.
Reference supply output of 5.1 volts. It can supply a minimum of 10mA.
– Current Sense Input. Inverting input for sensing peak current of the pass transistor
through series sense current monitor resistor.
+ Current Sense Input. Non-inverting input used in conjunction with pin 3. This senses the
positive end of current monitor resistor.
+ Error Amp In. Non-inverting input for output voltage regulation.
– Error Amp In. Inverting input of the amplifier for the reference voltage.
For compensation of the feedback loop response.
Timing capacitor (C
O)
input to set oscillator frequency in conjunction with pin 9, R
O
, resistor
input. Second function is for setting crossover dead time of pin 11and 14 outputs.
Timing resistor (R
O)
input to set oscillator frequency by setting constant current charge rate
to charge capacitor C
O
.
For PWM controller oscillator synchronization of two or more controllers. or as a clock input
to sync oscillator from external signal.
A output drive of phase A from push pull transistors.
Ground return for all input and output pins.
Supplies power to operate the output drivers only.
Output of phase B from push pull transistors.
Voltage bias supply for all TC170 circuits except the output transistors.
Input pin to disable both output drives to 0V OFF.
2
3
V
REF
OUT
– I
SENSE
IN
4
+ I
SENSE
IN
5
6
7
8
+ ERROR AMP IN
– ERROR AMP IN
CMPTR
C
O
9
R
O
10
SYNC
11
12
13
14
15
16
OUTPUT A
GND
V
DD
OUTPUT B
V
IN
SHUTDOWN
PIN CONFIGURATIONS
(DIP and SOIC)
TC170
CPE
SHDN
VDD
GND
SOFT START/
ILIM
OUT
OUTPUT B
VREF
– I SENSE IN
+ I SENSE IN
+ ERROR AMP IN
CMPTR
OUTPUT A
SYNC
RO
– ERROR AMP IN
NOTE:
Outputs LOW in "OFF" state.
VIN
CO
1
2
3
4
16
15
14
13
5
6
7
12
11
10
9
8
ACOM
CREF
1
2
3
4
15
16
14
13
5
6
7
12
11
10
9
8
TC170COE
BUF
VSS
CAZ
CINT
VREF
CREF
CMPTR OUT
A
VIN
VIN
VREF
DIGITAL GND
B
VDD
+
–
CMOS CURRENT MODE
PWM CONTROLLER
TC170
PIN DESCRIPTION
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