TK75001D TOKO [TOKO, Inc], TK75001D Datasheet

TK75001D

Manufacturer Part Number

TK75001D

Description

PWM CONTROLLER

Manufacturer

TOKO [TOKO, Inc]

Datasheet

1.TK75001D.pdf (13 pages)

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FEATURES

January 1999 TOKO, Inc.

DESCRIPTION

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.

TEMP. CODE (OPTIONAL)

I: -40 to +85 C

Optimized for Off-Line Operation

Maximum Duty Ratio 44% (typ.)

Maximum Clock Frequency Above 1 MHz

Frequency Reduction for Improved Overcurrent

Protection

Low Standby Current for Current-Fed Start-Up

Current-Mode or Voltage-Mode Control

Internal User-Adjustable Slope Compensation

Functionally Integrated & Simplified 5-pin Design

ORDERING INFORMATION

TK75001D

Tape/Reel Code

Temperature Code

TAPE/REEL CODE

MG: Magazine

APPLICATIONS

C T

Off-Line Power Supplies

Industrial Power Supplies

Telecom Power Supplies

Off-Line Battery Chargers

I CT

146 µA

I FR

1.35 V

0.98 V

Note: Pins 2 and 3 must be externally

2 mA

I DS

205 µA

I CHG

COMPENSATION

connected for proper operation.

SLOPE

BLOCK DIAGRAM

OVERCURRENT

OSCILLATOR

DETECTOR

CURRENT

CONTROL

FREQUENCY

REDUCTION

LATCH

TK75001

PWM CONTROLLER

DRV

GND

REFERENCE

BANDGAP

f CLK

PWM LATCH

C T

TOGGLE FF

10.5 V

GND

TK75001

UVLO

14.5 V

V CC

17.5 V

Page 1

V CC

DRV

Related parts for TK75001D

TK75001D Summary of contents

Page 1

... 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 TEMP. CODE (OPTIONAL) I: -40 to +85 C January 1999 TOKO, Inc. APPLICATIONS Off-Line Power Supplies ...

Page 2

TK75001 ABSOLUTE MAXIMUM RATINGS Supply Voltage (Low Impedance Source) ................ 16 V Supply Voltage (I < 30 mA) ...................... Self Limiting CC Power Dissipation (Note 1) ................................ 825 mW Output Energy (Capacitive Load) .............................. and FB Pins ...

Page 3

TK75001 ELECTRICAL CHARACTERISTICS (CONT.) Test Conditions Typical numbers apply unless otherwise specified ...

Page 4

TK75001 OSCILLOSCOPE TYPICAL PERFORMANCE CHARACTERISTICS SUPPLY CURRENT SUPPLY VOLTAGE VS DEVICE ON 12 0.6 STANDBY 0.4 0 (V) SLOPE COMPENSATION PEAK CURRENT TEMPERATURE VS. -100 -140 -180 -220 -260 -40 0 ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) SLOPE COMPENSATION RAMP GND 600 800 pF 450 300 150 TIME (µs) January 1999 TOKO, Inc. 60 TK75001 Page 5 ...

Page 6

TK75001 The TK75001 is intended for use as a primary-side Pulse Width Modulator (PWM) controller. The many features integrated into a simple 5-pin design allow easily configured for voltage-mode or current-mode control, fixed- frequency or fixed-off-time operation, ...

Page 7

SUPPLY VOLTAGE PIN ( This pin is connected to the supply voltage. The low current (500 A typ.) standby mode before the supply voltage exceeds 14.5 V (typ.), which is the upper threshold of ...

Page 8

TK75001 SELECTING A START-UP RESISTOR Figure 1 shows the typical application of the TK75001 in an off-line flyback power supply (input full-wave bridge and capacitor not shown). The IC starts when the voltage across the capacitor C reaches the UVLO ...

Page 9

T is the time required for the leakage inductance of the 1 flyback transformer to completely discharge its stored energy into the voltage clamp LEAK (7) where I is ...

Page 10

TK75001 SELF-BIASED POWER SUPPLY WITH CONSTANT- FREQUENCY CURRENT-MODE CONTROL Figure 3(a) shows the TK75001 IC in the typical application: a flyback converter with self-bias and constant-frequency current-mode control. Figure 3(b) shows the FB Pin voltage. In the converter, the voltage-error ...

Page 11

APPLICATION INFORMATION (CONT AUX DRV GND FIGURE 5: TK75001 IN A FORWARD CONVERTER WITH CONSTANT OFF-TIME CURRENT-MODE CONTROL 3 1.1 V ...

Page 12

TK75001 APPLICATION INFORMATION (CONT.) TK75001 OFF-LINE APPLICATION EXAMPLE Figure 8 shows an off-line, universal input power supply. The TK75001 is the controller IC for a flyback converter with self-bias and constant-frequency, current-mode control. The TK75001 drives the MOSFET ...

Page 13

DIP 9 0.15 - 0.05 2.54 0.46 Dimensions are shown in millimeters Tolerance: x.x = 0.2 mm (unless otherwise specified) TOKO AMERICA REGIONAL OFFICES Midwest Regional Office Western Regional Office Toko America, Inc. Toko ...

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