NTE NTE7109 Datasheet

NTE7109

Integrated Circuit

Switching Regulator Control

Description:

The NTE7109 is a primary switching regulator controller in a 16–Lead DIP type package designed
to get the regulated DC voltage from an AC power supply . This device can directly drive a MOSFET
with fast rise and fall output pulses.

The NTE7109 contains not only a high frequency OSC and fast output drive, but also a current limiter
with fast response and high sensibility so a true “fast switching regulator” can be realized. By adding
additional compenents to the primary side, a timer–type protection circuit can be made for protection
against short–circuit and overcurrent.

Features:

D 500kHz Operation to MOSFET

• Output Current: ±2A

• Output Rise Time: 60ns; Fall Time: 40ns

• Modified Totem–Pole Output Method with Low Through Current

D Compact and Light–Weight Power Supply

• Low Start–Up Current: 90µA Typ.

• Wide Range Between “Start–Up Voltage” and “Stop Voltage” make the Power Input Smooting

Capacitor Low; Start–Up Threshold Voltage: 16V; Stop Voltage: 10V

• High Power Dissipation Package withstands the Heat Generated bt the Gate–Drive Current
of a MOSFET

D Simplified Peripheral Circuit with Protection Circuit and Built–In Large–Capacity Totem–Pole

Output

• High–Speed Current Limiting Circuit using Pulse–by–Pulse Method (Two Systems of
CLM+pin, CLM–pin)

• Protection by Intermittent Operation of Output Overcurrent: Timer Protection Circuit

• Overvoltage Protection Circuit with an Externally Resettable Latch (OVP)

• Protection Circuit for Output Miss Action at Low Supply Voltage (UVLO)

D High–Performance and Highly Functional Power Supply

• Triangular Wave Oscillator for Easy Dead Time Setting

Applications:

D Feed Forward Regulator
D Flyback Regulator

Absolute Maximum Ratings:

Supply Voltage, V
Collector Voltage, V
Output Current, I

CC

C

O

Peak ±2A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous ±0.5A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VF Terminal Voltage, V
ON/OFF Terminal Voltage, V
CLM – Terminal Voltage, V
CLM + Terminal Voltage, V
OVP Terminal Current, I
DET Terminal Voltage, V
DET Terminal Input Current, I
F/B Terminal Voltage, V
T–ON Terminal Input Current, I

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VF

ON/OFF
CLM –
CLM +

OVP

DET

DET

F/B

TON

T–OFF Terminal Input Current, I
Power Dissipation (T

= +25°C), P

A

Derate Above 25° 12mW/°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Junction Temperature, T

J

Operating Temperature Range, T
Storage Temperature Range, T

stg

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

TOFF

d

opr

–30° to +85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–40° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V

CC

V

CC

–4.0 to +4.0V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–0.3 to +4.0V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

0 to 10V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–1mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–2mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.5W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

+150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Note 1. “+” sign shows the direction of current flow into the IC and “–” sigh shows the current flow

from the IC.

Note 2. This terminal has the constant voltage characteristic of 6V to 8V when current is supplied

from outside. The maximum allowable voltage is 6V when the constant voltage is applied
to this terminal. And maximum allowable current into this terminal is 5mA.

Note 3. The low impedance voltage supply should not be applied to the OVP terminal.

Recommended Operating Conditions:

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Voltage Range V
Operating Frequency f
Oscillator Frequency Setting Resistance

T–ON Pin Resistance

T–OFF Pin Resistance R

OSC

R

OFF

CC

ON

12 18 30 V

– – 500 kHz

10 – 75 kΩ

2 – 30 kΩ

Electrical Characteristics: (VCC = 18V, TA = +25°C unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

Supply Voltage Circuit Current

Operating Supply Voltage Range V
Operation Start–Up Voltage V
Operation Stop Voltage V
Difference Between Operation

Start and Stop Voltage

Stand–By Current I

CC(STAR T)

CC(STOP)

∆V

CC

CCL

CC

V

CC(STOP)

15.2 16.2 17.2 V

9.0 9.9 10.9 V

∆VCC = V

VCC = 14.5V, TA = +25°C 50 90 140 µA
VCC = 14.5V, –30° ≤ TA ≤ +85°C 40 90 190 µA

CC(STAR T)

– V

CC(STOP)

5.0 6.3 7.6 V

– 30 V