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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 Vref is stabilized before the output stage is enabled. Ion-implant resistors 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 Vref Stabilized before Output Stage is Enabled 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 Absolute Maximum Ratings: Supply Voltage (ICC < 30mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Limiting Supply Voltage (Low Impedence Source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5J Analog Inputs (Pin2, Pin3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Elecrtrical Characteristics: (0 TA +70C, VCC = 15V, Rt = 680, Ct = .022F, Note 1 unless otherwise specified)
Parameter Reference Section Output Voltage Line Regulation Load Regulation Temperature Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short Circuit Oscillator Section Initial Accuracy Voltage Stability Temperature Stability Amplitude Discharge Current Error Amp Section Input Voltage Input Bias Current AVOL Unity Gain Bandwidth PSRR Output Sink Current Output Source Current VOUT High VOUT Low Current Sense Section Gain Maximum Input Signal PSRR Input Bias Current Delay to Output Output Section Output Low Level Output High Level Rise Time Fall Time Output Leakage Total Standby Current Start-Up Current Operating Supply Current VCC Zener Voltage VPIN2 = VPIN3 = 0V, RT = 10K, CT = 3.3nF ICC = 25mA - - - 0.5 11 34 1.0 17 - mA mA V ISINK = 20mA ISINK = 200mA ISOURCE = 20mA ISOURCE = 200mA TJ = +25C,CL = 1nF, Note 2 TJ = +25C,CL = 1nF, Note 2 VCC = 14V, UVLO Active, VPIN6 = 0 - - 13.0 12.0 - - - 0.1 1.5 13.5 13.5 50 50 -0.01 0.4 2.2 - - 150 150 -10 V V V V ns ns A TJ = +25C, Note 2 Note 3, Note 4 VPIN1 = 5V, Note 3 12V VCC 25V, Note 3 2.85 0.9 - - - 3.00 1.0 70 -2 150 3.15 1.1 - -10 300 V/V V dB A ns 2V VO 4V Note 2 12V VCC 25V VPIN2 = 2.7V, VPIN1 = 1.1V VPIN2 = 2.3V, VPIN1 = 5V VPIN2 = 2.3V, RL = 15K to GND VPIN2 = 2.7V, RL = 15K to Pin8 VPIN1 = 2.5V 2.42 - 65 0.7 60 2 -0.5 5 - 2.50 -0.3 90 1.0 70 6 -0.8 6 0.7 2.58 -2.0 - - - - - - 1.1 V A dB MHz dB mA mA V V TJ = +25C 12V VCC 25V 0 TA +70C, Note 2 VPIN4 peak to peak TJ = +25C 0 TA +70C 47 - - - 7.8 7.6 52 0.2 5 1.7 8.3 - 57 1.0 - - 8.8 9.0 kHz % % V mA mA TJ = +25C, IO = 1mA 12V VIN 25V 1mA IO 20mA Note 2 Line, Load, Temperature, Note 2 10Hz f 10kHz, TJ = +25C, Note 2 TA = +125C, 1000Hrs., Note 2 TA = +25C 4.9 - - - 4.82 - - -30 5.0 6 6 0.2 - 50 5 -100 5.1 20 25 0.4 5.18 - 25 -180 V mV mV mV/C V V mV mA Test Conditions Min Typ Max Unit
Parameter Under-Voltage Lockout Section Start Threshold NTE7096 NTE7097 Minimum Operating Voltage NTE7096 NTE7097 After Turn On
Test Conditions
Min
Typ
Max
Unit
14.5 7.8 8.5 7.0
16.0 8.4 10.0 7.9
17.5 9.0 11.5 8.2
V V V V
Note Note Note Note
1. 2. 3. 4.
Adjust VCC above the start threshold before setting at 15V. These parameters, although guaranteed, are not 100% tested in production. Parameter measured at trip point of latch with VPIN2 = 0. Gain defined as: VPIN1 ; 0 VPIN3 0.8V A= VPIN3
Pin Connection Diagram COMP VFB ISENSE RTCT 1 2 3 4 8 7 6 5 VREF VCC OUTPUT GND
8
5
.260 (6.6)
1
4
.390 (9.9) Max .155 (3.93)
.300 (7.62)
.100 (2.54) .300 (7.62)
.145 (3.68)

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