LM1391 Phase-Locked Loop Analogue TV 40V 30mA IC PDIP-8
The LM1391 is a specialized analogue phase-locked loop (PLL) IC engineered primarily for the horizontal section of television receivers. It integrates a stable voltage-controlled oscillator (VCO), a linear pulse phase detector, and a driver whose duty cycle can be varied by DC control. An internal active regulator improves supply rejection, while the output transistor provides low saturation and a high voltage swing suitable for direct interfacing with deflection and timing circuitry.
It supports automatic pulse control (APC) of the oscillator synchronized to incoming sync signals and yields a typical pull-in around 300 Hz with a hold-in up to 900 Hz, delivering robust lock performance. The balanced linear phase detector and low thermal frequency drift minimize static phase error, while adjustable DC loop gain lets designers tune transient response and stability for different receiver topologies.
Physically available in an 8-pin PDIP, the LM1391 includes application-friendly options such as an uncommitted output-collector pin for flexible interfacing and a regulator output for internal biasing. Typical uses are TV horizontal processors and low-frequency PLL tasks requiring precise timing and adjustable duty-cycle outputs. Its modest supply current and high-voltage output capability make it suitable for many legacy and industrial analogue systems worldwide.
Features:
- Internal active regulator for improved supply rejection.
- Uncommitted collector of output transistor.
- Output transistor with low saturation and high voltage swing.
- APC (automatic pulse control) of the oscillator with a synchronizing signal.
- DC-controlled output duty cycle.
- Typical pull-in ≈ 300 Hz.
- Linear, balanced pulse phase detector.
- Low thermal frequency drift.
- Small static phase error.
- Adjustable DC loop gain.
Specifications:
| Parameter | Value |
|---|---|
| Absolute max: Supply current: | 40 mA (absolute max) |
| Absolute max: Output voltage: | 40 V (Vce max) |
| Absolute max: Output current: | 30 mA (collector) |
| Sync input voltage (Pin 3) range: | 2.0 to 5.0 Vp-p |
| Sawtooth / flyback input (Pin 4): | 1.0 to 3.0 Vp-p; Pin4 test level ~2.0 VDC |
| Regulated output (Pin 6): | Typical 8.6 V (8.0–9.2 V range at I6 = 22 mA) |
| Supply Current: | ~20 mA (operating, per datasheet test) |
| Collector-emitter saturation (Ic = 20 mA): | 0.30 – 0.40 V |
| Oscillator pull-in range (adj. RH): | ≥ 300 Hz |
| Oscillator hold-in range (adj. RH): | ≥ 900 Hz |
| Static phase error (Df @ 300 Hz): | ≈ 0.5 ms |
| Phase detector leakage: | ≤ 1.0 mA |
| Maximum oscillator frequency: | 500 kHz |
| Power dissipation (package): | 1000 mW (package limitation) |
| Operating temperature (ambient): | 0 °C to +70 °C |
| Storage temperature: | −65 °C to +150 °C |
| Lead soldering temperature (10 s): | 260 °C |
Pinout:
Applications:
- Television horizontal timing and horizontal-section processors.
- General purpose phase-locked loop and frequency synthesis in low-frequency systems.
- Variable duty-cycle oscillators and timing generators.
- Sync-locked control loops for motor or scanning systems.
- Signal processing, measurement, and instrumentation requiring stable VCOs.
Package Include:
- 1x LM1391 Phase-Locked Loop Analogue TV 40V 30mA IC PDIP-8