View NTE1765_1290304.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

NTE1765 Integrated Circuit Dual Channel Current Mode Controller
Description: The NTE1765 is a high performance, fixed frequency, dual current mode controller in a 16-Lead DIP type package. This device is specifically designed for Off-Line and DC to DC converter applications offering the designer a cost effective solution with minimal external components. The NTE1765 features a unique oscillator for precise duty cycle limit and frequency control, a temperature compensated reference, two high gain error amplifiers, two current sensing comparators, drive output 2 enable pin, and two high current totem pole outputs ideally suited for driving power MOSFETS. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, and a latch for single pulse metering of each output. Features: D Unique Oscillator for Precise Duty Cycle Limit and Frequency Control D Current Mode Operation to 500kHz D Automatic Feed Forward Compensation D Separate Latching PWMs for Cycle-By-Cycle Current Limiting D Internally Trimmed Reference with Undervoltage Lockout D Drive Output 2 Enable Pin D Two High Current Totem Pole Outputs D Input Undervoltage Lockout with Hysteresis D Low Start-Up and Operating Current Absolute Maximum Ratings: Total Power Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Zener Current, IZ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Output Current, Source or Sink (Note 1), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A Output Energy (Capacitive Load per Cycle), W . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.0J Current Sense, Enable and Voltage Feedback Inputs, Vin . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +5.5V Sync Input, High State (Voltage), VIH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V Sync Input, Low State (Reverse Current), IIL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5.0mA Error Amp Output Sink Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Maximum Power Dissipation (TA = +25C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25mW Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100C/W Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150C Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Note 1. Maximum package power dissipation limits must be observed.
Electrical Characteristics: (VCC = 15V (Note 2), RT = 8.2k, CT = 3.3nF, Note 3 unless otherwise specified)
Parameter Reference Section Reference Output Voltage Line Regulation Load Regulation Total Output Variation over Line, Load and Temperature Output Short Circuit Current Oscillator and PWM Sections Total Frequency Variation over Line and Temperature Frequency Change with Voltage Duty Cycle at each Output Maximum Minimum Sync Input Current High State Low State Error Amplifiers Voltage Feedback Input Input Bias Current Open-Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Output Current Source Sink Output Voltage Swing High State Low State Current Sense Section Current Sense Input Voltage Gain Max. Current Sense Input Threshold Input Bias Current Propagation Delay (Current Sense Input to Output AV Vth IIB tPLN(IN/OUT) Note 4, Note 5 Note 4 2.75 430 - - 3.00 480 -2 150 3.25 530 -10 300 V/V mV A ns VFB IIB AVOL BW PSRR ISource ISink VOH VOL VO = 2.5V VFB = 5V VO = 2V to 4V TJ = +25C VCC = 11V to 15V VO = 3V, VFB = 2.3V VO = 1.2V, VFB = 2.7V RL = 15k to GND, VFB = 2.3V RL = 15k to Vref, VFB = 2.7V 2.42 - 65 0.7 60 -0.45 2.0 - 5.0 - 2.50 -0.1 100 1.0 90 - -1.0 12 6.2 0.8 2.58 -1.0 - - - - - - - 1.1 V A dB MHz dB mA mA mA V V fOSC fOSC/V DCmax DCmin IIH IIL Vin = 2.4V Vin = 0.8V VCC = 11V to 15V, TA = 0 to +70C VCC = 11V to 15V 46.5 - 46.0 - - - 49.0 0.2 49.5 - 170 80 51.5 1.0 52.0 0 250 160 kHz % % % A A Vref Regline Regload Vref ISC IO = 1mA, TJ = +25C VCC = 11V to 15V IO = 1mA to 10mA 4.9 - - 4.85 30 5.0 2.0 3.0 - 100 5.1 20 25 5.15 - V mV mV V mA Symbol Test Conditions Min Typ Max Unit
Note 2. Adjust VCC above the Start-Up threshold before setting to 15V. Note 3. For typical values, TA = +25C; for Min/Max values, TA = 0 to +70C. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. Note 4. This parameter is measured at the latch trip point with Vfb = 0V. V Compensation Note 5. Comparator gain is defined as AV = V Current Sense
Electrical Characteristics (Cont'd): (VCC = 15V (Note 2), RT = 8.2k, CT = 3.3nF, Note 3 unless otherwise specified)
Parameter Drive Output 2 Enable Pin Enable Pin Voltage High State Low State Low State Input Current Drive Outputs Output Voltage Low State High State VOL VOH VOL(UVLO) tr tf Vth VCC(min) ICC VCC = 12V Note 2 VZ ICC = 30mA - - 15.5 0.6 20 17.0 1.0 25 19.0 mA mA V ISink = 20mA ISink = 200mA ISource = 20mA ISource = 200mA Output Voltage with UVLO Activated Output Voltage Rise Time Output Voltage Fall Time Undervoltage Lockout Section Start-Up Threshold Min. Operating Voltage After Turn-On Total Device Power Supply Current Start-Up Operating Power Supply Zener Voltage 13 9.0 14 10.0 15 11.0 V V VCC = 6V, ISink = 1mA CL = 1nF CL = 1nF - - 13.0 12.0 - - - 0.1 1.6 13.5 13.4 0.1 28 25 0.4 2.5 - - 1.1 150 150 V V V V V ns ns VIH VIL IIB Output 2 Enabled Output 2 Disabled VIL = 0V 3.5 0 100 - - 250 Vref 1.5 400 V V A Symbol Test Conditions Min Typ Max Unit
Note 2. Adjust VCC above the Start-Up threshold before setting to 15V. Note 3. For typical values, TA = +25C; for Min/Max values, TA = 0 to +70C. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Pin Connection Diagram
Sync Input 1 CT 2 RT 3 Voltage Feedback 1 4 Compensation 1 5 Current Sense 1 6 Drive Output 1 7 GND 8
16 VCC 15 Vref 14 Drive Output 2 Enable 13 Voltage Feedback 2 12 Compensation 2 11 Current Sense 2 10 Drive Output 2 9 Drive GND
16
9
.260 (6.6) Max
1
8
.785 (19.9) Max
.300 (7.62)
.200 5.08) Max .245 (6.22) Min
.100 (2.54)
.700 (17.7)

▲Up To Search▲

Price & Availability of NTE1765

	To Download NTE1765 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .