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NTE914 Integrated Circuit Zero-Voltage Switch
Description: The NTE914 zero-voltage switch is a monolithic silicon integrated circuit in a 14-Lead DIP type package designed to control a thyristor in a variety of AC power switching applications for AC input voltages of 24V, 120V, 208/230V, and 277V at 50/60Hz and 400Hz. The NTE914 incorporates 4 functional blocks as follows: Limiter-Power Supply: Permits operation directly from an AC line. Differential ON/OFF Sensing Amplifier: Tests the condition of external sensors or command signals. Hysteresis or proportional-control capability may easily be implemented in this section. Zero-Crossing Detector: Synchronizes the output pulses of the circuit at the time when the AC cycle is at zero voltage point; thereby eliminating radio-frequency interference (RFI) when used with resistive loads. TRIAC Gating Circuit: Provides high current pulses to the gate of the power controlling thyristor. The NTE914 also provides the following important auxiliary functions: A built-in protection circuit that may be actuated to remove drive from the TRIAC if the sensor opens or shorts. Thyristor firing may be inhibited through the acting of an internal diode gate connected to Pin1. High-power DC comparator operation is provided by overriding the action of the zero-crossing detector. This is accomplished by connecting Pin12 to Pin7. Gate current to the thyristor is continuous when Pin13 is positive with respect to Pin9. Features: D 24V, 120V, 208/230V, 277V at 50Hz, 60Hz, or 400Hz Operation D Differential Input D Low Balance Input Current: 1A Max D Built-In Protection Circuit or Opened or Shorted Sensor D Sensor Range: RX = 2 to 100k D DC Mode D External Trigger D External Inhibit D DC Supply Voltage: 14V Max
Applications: D Relay Control D Valve Control D Synchronous Switching of Flashing Lights D ON/OFF Motor Switching D Differential Comparator with Self-Contained Power Supply for Industrial Applications D Photosensitive Control D Power One-Shot Control D heater Control D Lamp Control Absolute Maximum Ratings: (TA = +25C unless otherwise specified) DC Supply Voltage (Between Pin2 and Pin7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V DC Supply Voltage (Between Pin2 and Pin8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V Peak Supply Current (Between Pin5 and Pin7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Output Pulse Current (Pin4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA Power Dissipation (TA +55C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 700mW Derate Linearly Above 55C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.67mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to + 150C Lead Temperature (During Soldering 1/16" from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265C Electrical Characteristics: (TA = +25C, All voltages are measured with respect to Pin7 unless otherwise specified)
Parameter DC Supply Voltage (Inhibit Mode) At 50/60Hz At 400Hz DC Supply Voltage (Pulse Mode) At 50/60Hz At 400Hz Gate Trigger Current Peak Output Current (Pulsed) With Internal Power Supply With External Power Supply Inhibit Input Ratio Total Gate Pulse Duration (Positive dv/dt) 50-60Hz 400Hz Total Gate Pulse Duration (Negative dv/dt) 50-60Hz 400Hz tN V9/V2 tP IGT(4) IOM(4) VS Symbol Test Conditions Min Typ Max Unit For Operation at 120Vrms, 50-60Hz (AC Line Voltage) (Note 1) VS RS = 8k, IL = 0 RS = 5k, IL = 2mA RS = 10k, IL = 0 RS = 8k, IL = 0 RS = 5k, IL = 2mA RS = 10k, IL = 0 VGT = 1V, Pin3 and Pin4 Connected VGT = 0, Pin3 Open VGT = 0, Pin3 and Pin2 Connected V+ = 12V, VGT = 0, Pin3 Open V+ = 12V, VGT = 0, Pin3 and Pin2 Connected Voltage Ratio of Pin9 to Pin2 6.1 - - 6.0 - - - 50 90 - - 6.5 6.4 6.8 6.4 6.3 6.7 105 84 124 170 240 7.0 - - 7.0 - - - - - - - V V V V V V mA mA mA mA mA
0.465 0.485 0.520 s s s s
CEXT = 0 CEXT = 0, REXT =
70 -
100 12
140 -
CEXT = 0 CEXT = 0, REXT =
70 -
100 10
140 -
Note 1. The values given in the "Electrical Characteristics" chart at 120V also apply for operation at input voltages of 24V, 208/230V, and 277V, except for Pulse Duration. However, the series resistor (RS) must have the indicated value shown in Table 1 for the specified value.
Electrical Characteristics (Cont'd): (TA = +25C, All voltages are measured with respect to Pin7 unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit For Operation at 120Vrms, 50-60Hz (AC Line Voltage) (Note 1) Pulse Duration After Zero Crossing (50-60Hz) For Positive dv/dt For Negative dv/dt Output Leakage Current (Inhibit Mode) Input Bias Current Common-Mode Input Voltage Range Sensitivity (Pulse Mode) CEXT = 0, REXT = s s s nA V - mV
tP1 tN1 I4 II VCMR V13
- - - -
50 60 0.001 220 1.5 to 5.0
- - 10 1000
Pin9 and Pin13 Connected Pin12 Open, Note 2 -
6
Note 1. The values given in the "Electrical Characteristics" chart at 120V also apply for operation at input voltages of 24V, 208/230V, and 277V, except for Pulse Duration. However, the series resistor (RS) must have the indicated value shown in Table 1 for the specified value. Note 2. Required voltge change at Pin13 to either turn OFF the TRIAC or turn ON the TRIAC when OFF. Table 1:
AC Input Voltage (50/60 or 400Hz) V AC 24 120 208/230 277 Input Series Resistor, RS kW 2 10 20 25 Pin Connection Diagram Dissipation Rating for RS W 0.5 2.0 4.0 5.0
Inhibit Input Sensor Network Current Boost Thyristor Gate AC Input External Trigger Common
1 2 3 4 5 6 7
14 Failsafe Input 13 Sensor Network 12 Zero-Crossing Det Input 11 Off-On Sense Amp 10 Off-On Sense Amp 9 8 Off-On Sense Amp Common
14
8
1
7
.785 (19.95) Max
.300 (7.62)
.200 (5.08) Max
.100 (2.45) .600 (15.24)
.099 (2.5) Min

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