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PDF TK75001 Data sheet ( Hoja de datos )
| Número de pieza | TK75001 | |
| Descripción | PWM CONTROLLER | |
| Fabricantes | TOKO | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TK75001 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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TK75001
PWM CONTROLLER
FEATURES
s Optimized for Off-Line Operation
s Maximum Duty Ratio 44% (typ.)
s Maximum Clock Frequency Above 1 MHz
s Frequency Reduction for Improved Overcurrent
Protection
s Low Standby Current for Current-Fed Start-Up
s Current-Mode or Voltage-Mode Control
s Internal User-Adjustable Slope Compensation
s Functionally Integrated & Simplified 5-pin Design
DESCRIPTION
APPLICATIONS
s Off-Line Power Supplies
s Industrial Power Supplies
s Telecom Power Supplies
s Off-Line Battery Chargers
The TK75001 is a simplified primary side controller
optimized for off-line switching power supplies. It is suitable
for both voltage-mode and current-mode control and has
advanced features not available in controllers with a higher
pin count. The key to full functionality in a 5-pin design is
that the current signal and the error signal are added
together and fed into the feedback pin. A sawtooth current
flowing out of the feedback pin provides a slope
compensation ramp (in current-mode applications) or a
PWM ramp (in voltage-mode applications), in proportion to
the resistance terminating that pin. If the sum of the current
sense signal, error signal and ramp signal exceeds the
Overcurrent Detector threshold indicating that the Current
Control Detector has lost control of the switch current, the
charging current of the timing capacitor will be reduced to
about 25% for the remainder of the clock period. The
reduced charging current causes no more than a one-third
reduction in switching frequency, effectively preventing
short-circuit current runaway.
The TK75001 is available in an 8-pin DIP package.
ORDERING INFORMATION
TK75001D
Tape/Reel Code
Temperature Code
TEMP. CODE (OPTIONAL)
I: -40 to +85 C
TAPE/REEL CODE
MG: Magazine
TK75001
75001
DRV
GND
GND
CT
Note: Pins 2 and 3 must be externally
connected for proper operation.
VCC
NC
NC
FB
BLOCK DIAGRAM
VCC
ICT
CT
IFR
146 µA
ICHG
205 µA
IDS
2 mA
OSCILLATOR
BANDGAP
REFERENCE
fCLK
UVLO
14.5 V
10.5 V
17.5 V
R
FREQUENCY
Q REDUCTION
LATCH
S
TOGGLE FF
TQ
SLOPE
COMPENSATION
PWM LATCH
S
OVERCURRENT
DETECTOR
Q
R
1.35 V
CURRENT
CONTROL
FB DETECTOR
0.98 V
DRV
GND
January 1999 TOKO, Inc.
Page 1
1 page  
TK75001
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
SLOPE COMPENSATION RAMP
RFB = 3 k to GND
600 CT = 800 pF
450
300
150
0
0 10 20 30 40 50 60
TIME (µs)
January 1999 TOKO, Inc.
Page 5
5 Page 
TK75001
APPLICATION INFORMATION (CONT.)
TK75001 IN NON-ISOLATED APPLICATIONS
VIN
VAUX Figure 7 shows a buck-boost converter with a negative
+ input voltage and a positive output voltage, controlled by
VOUT the TK75001. The Error Amplifier is a TL431 shunt regulator,
and a PNP transistor provides interface between the
VCC
CT TL431 and the control IC.
Q1
DRV
VAUX
CT
FB
GND
RS
R1
OC
VOUT (+)
TL431
FIGURE 5: TK75001 IN A FORWARD CONVERTER
WITH CONSTANT OFF-TIME CURRENT-MODE
CONTROL
CT
0
FB
3.2 V
1.1 V
0.98 V
FEEDBACK VOLTAGE LEVEL
CT
FB
VIN (-)
VCC
CT
DRV
FB
GND
TL431
FIGURE 7: NON-ISOLATED NEGATIVE-TO-POSITIVE
CONVERTER
FIGURE 6: TIMING PIN AND FEEDBACK PIN
VOLTAGES WITH CONSTANT OFF-TIME CURRENT-
MODE CONTROL
January 1999 TOKO, Inc.
Page 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TK75001.PDF ] | |
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