NTE NTE7097, NTE7096 Datasheet

NTE7096 & NTE7097

Integrated Circuit

Current Mode Pulse Width Modulator (PWM)

Control Circuit

Description:

The NTE7096 and NTE7097 are integrated circuits in 8–Lead DIP type packages that incorporate a
new precision temperature–controlled oscillator with an internally trimmed discharge current to mini­mize variations in frequency. A precision duty–cycle clamp eliminates any need for an external oscil­lator when at, or near, a 50% duty–cycle condition. Duty–cycles greater than 50% are also possible.
Special logic ensures that V
provide tighter control of under–voltage lockout.

Other features include low start–up current, pulse–by–current limiting, and high–current totem pole
output for driving capacitive loads, such as the gate of a power MOSFET. The output is low in the
off state, consistent with N–channel devices.

Features:

D Optimized for Off–Line Control
D Internally Trimmed Temperature Compensated Oscillator
D Maximum Duty–Cycle Clamp
D V
D Low Start–Up Current
D Pulse–by Pulse Current Limiting
D Improved U/V Lockout
D Double Pulse Suppression
D 1% Trimmed Bandgap Reference
D High Current Totem Pole Output

Stabilized before Output Stage is Enabled

ref

is stabilized before the output stage is enabled. Ion–implant resistors

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Absolute Maximum Ratings:

Supply Voltage (ICC < 30mA) Self Limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Supply Voltage (Low Impedence Source) 30V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Current ±1A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Output Energy (Capacitive Load) 5µJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Inputs (Pin2, Pin3) –0.3V to V

Error Amp Output Sink Current 10mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

CC

Elecrtrical Characteristics: (0° ≤ TA ≤ +70°C, VCC = 15V, Rt = 680Ω, Ct = .022µF, Note 1 unless

otherwise specified)

Parameter Test Conditions Min Typ Max Unit

Reference Section

Output Voltage TJ = +25°C, IO = 1mA 4.9 5.0 5.1 V
Line Regulation 12V ≤ VIN ≤ 25V – 6 20 mV
Load Regulation 1mA ≤ IO ≤ 20mA – 6 25 mV
Temperature Stability Note 2 – 0.2 0.4 mV/°C
Total Output Variation Line, Load, Temperature, Note 2 4.82 – 5.18 V
Output Noise Voltage 10Hz ≤ f ≤ 10kHz, TJ = +25°C, Note 2 – 50 – µV
Long Term Stability TA = +125°C, 1000Hrs., Note 2 – 5 25 mV
Output Short Circuit TA = +25°C –30 –100 –180 mA

Oscillator Section

Initial Accuracy TJ = +25°C 47 52 57 kHz
Voltage Stability 12V ≤ VCC ≤ 25V – 0.2 1.0 %
Temperature Stability 0° ≤ TA ≤ +70°C, Note 2 – 5 – %
Amplitude V
Discharge Current TJ = +25°C 7.8 8.3 8.8 mA

Error Amp Section

Input Voltage V
Input Bias Current – –0.3 –2.0 µA
A

VOL

Unity Gain Bandwidth Note 2 0.7 1.0 – MHz
PSRR 12V ≤ VCC ≤ 25V 60 70 – dB
Output Sink Current V
Output Source Current V
V

High V

OUT

V

Low V

OUT

Current Sense Section

Gain Note 3, Note 4 2.85 3.00 3.15 V/V
Maximum Input Signal V
PSRR 12V ≤ VCC ≤ 25V, Note 3 – 70 – dB
Input Bias Current – –2 –10 µA
Delay to Output TJ = +25°C, Note 2 – 150 300 ns

Output Section

Output Low Level I

Output High Level I

Rise Time TJ = +25°C,CL = 1nF, Note 2 – 50 150 ns
Fall Time TJ = +25°C,CL = 1nF, Note 2 – 50 150 ns
Output Leakage VCC = 14V, UVLO Active, V

Total Standby Current

Start–Up Current – 0.5 1.0 mA
Operating Supply Current V
VCC Zener Voltage ICC = 25mA – 34 – V

peak to peak – 1.7 – V

PIN4

0° ≤ TA ≤ +70°C 7.6 – 9.0 mA

= 2.5V 2.42 2.50 2.58 V

PIN1

2V ≤ VO ≤ 4V 65 90 – dB

= 2.7V, V

PIN2

= 2.3V, V

PIN2

= 2.3V, RL = 15K to GND 5 6 – V

PIN2

= 2.7V, RL = 15K to Pin8 – 0.7 1.1 V

PIN2

= 5V, Note 3 0.9 1.0 1.1 V

PIN1

= 20mA – 0.1 0.4 V

SINK

I

= 200mA – 1.5 2.2 V

SINK
SOURCE

I

SOURCE

= 20mA 13.0 13.5 – V
= 200mA 12.0 13.5 – V

= V

PIN2

PIN3

= 1.1V 2 6 – mA

PIN1

= 5V –0.5 –0.8 – mA

PIN1

= 0 – –0.01 –10 µA

PIN6

= 0V, RT = 10K, CT = 3.3nF – 11 17 mA