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NTE7098 & NTE7099 Integrated Circuit Current Mode Pulse Width Modulator (PWM) Control Circuit
Description: The NTE7098 and NTE7099 are integrated circuits in 8-Lead DIP type packages that incorporate a new precision temperature-controlled oscillator to minimize variations in frequency. An internal toggle flip-flop, which blanks the output off every other clock cycle, limits the duty-cycle range to less than 50%. An under-voltage lockout ensures that VREF is stabilized before the output stage is enabled. 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 Temperature Compensated Oscillator D 50% 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 (VFB, VSENSE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Elecrtrical Characteristics: (0 TA +70C, VCC = 15V, RT = 10K, CT = 3.3nF for sawtooth mode, 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 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 Total Standby Current Start-Up Current Operating Supply Current VCC Zener Voltage PWM Section Maximum Duty Cycle Minimum Duty Cycle 46 - 48 - 50 0 % % VFB = VSENSE = 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 - - 13.0 12.0 - - 0.1 1.5 13.5 13.5 50 50 0.4 2.2 - - 150 150 V V V V ns ns Note 3, Note 4 VCOMP = 5V, Note 3 12V VCC 25V, Note 3 VSENSE = 0V TJ = +25C, Note 2 2.85 0.9 - - - 3.00 1.0 70 -2 150 3.15 1.1 - -10 300 V/V V dB A ns VCOMP = 2.5V VFB = 0V 2V VO 4V Note 2 12V VCC 25V VFB = 2.7V, VCOMP = 1.1V VFB = 2.3V, VCOMP = 5V VFB = 2.3V, RL = 15K to GND VFB = 2.7V, RL = 15K to Pin8 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 Sawtooth Mode, TJ = +25C 12V VCC 25V Sawtooth Mode, 0 TA +70C, Note 2 VPIN4 peak to peak 47 - - - 52 0.2 5 1.7 57 1.0 - - kHz % % V TJ = +25C, IREF = 1mA 12V VIN 25V 1mA IREF 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 NTE7098 NTE7099 Minimum Operating Voltage NTE7098 NTE7099 After Turn On
Test Conditions
Min
Typ
Max
Unit
14.5 7.8 8.5 7.0
16.0 8.4 10.0 7.6
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 VFB = 0. Gain defined as: VCOMP ; 0 VPIN3 0.8V A= VSENSE
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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