NOT RECOMMENDED FOR NEW DESIGN - NO ALTERNATE PART ZLPM8012 SET-TOP BOX SERIES SINGLE LNB CONTROLLER AND POWER SUPPLY IC Summary Applications The ZLPM8012 is a power management and control solution for Single tuner Satellite Set-top boxes satellite set-top boxes (STBs). Based on an efficient boost converter High current LNBs the ZLPM8012 provides the power supply and all the control signals Stability with minimal current LNBs required by a single port satellite Low Noise Block (LNB). The Satellite PC Cards ZLPM8012 includes an accurate 22kHz tone generator to provide TVs with integrated satellite tuners DiSEqC control words or continuous tone for band switching Hybrid Set-top boxes 2 control. Controlled by I C and with the minimal external components Suitable for Digital and Analog satellite systems the ZLPM8012 provides a high performing cost efficient solution. System Diagram Features Efficient boost converter providing an accurate adjustable power supplies LNBs Operates from a single rail supply Provides a protected output of up to 550mA Adjustable current limit for system flexibility Designed for stability with low power LNBs Provides standard voltage / tone and DiSEqC control signals and allows for regional variations. Internal 22kHz generator for DiSEqC control and traditional band switching 22kHz maintains shape across all load conditions 2 Controlled by I C Built in multiple diagnostics and protection for IC and LNB protection Minimal external components for a simple, reliable and cost effective solution Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See NOT RECOMMENDED FOR NEW DESIGN - NO ALTERNATE PART ZLPM8012 Product Description The ZLPM8012 range provides a highly integrated monolithic power management solution to meet the demands of satellite receiver Low Noise Blocks (LNBs). Its internal circuit blocks include an efficient boost converter, a low noise low dropout regulator (LDOR), a tone generator and 2 modulator, an I C interface and a logic tone enable pin. Most internal circuits are powered by an internal 3.3V regulator. A block diagram of the ZLPM8012 is shown in Figure 1. Boost Converter and LNB Power Supply The boost converter is used to generate a user trimable 13V/18V LNB supply using a standard STB power rail of 12V. The operating frequency of this switching converter is user controlled over the range 100kHz to 500kHz. The frequency is selected using an external capacitor wired to pin Fosc. The ZLPM8012 uses internal frequency compensation to maintain the loop stability of the switching regulator. This highly efficient converter includes over-voltage and over-current protection. The boost converter supplies a low noise, low voltage drop linear regulator used for tone modulation and LNB isolation as part of STB power saving strategies. The LDOR also provides line open-circuit, line short circuit, soft start and current limiting systems. The boost converter/LDOR combination can supply a continuous LNB load of up to 550mA. The LNB supply V is programmable to allow the user to provide accurate cable OUT length compensation, specialist markets or to search for the voltage threshold level of the LNB. The slew rate of V is programmable via capacitor CS. This capacitor is not required for stability reasons so it can be omitted. OUT 2 The V output of the ZLPM8012 can be enabled or disabled using the I C Enable control bit. When disabled, the IC adopts a very low current OUT Stand-By mode where all non-essential circuits are shut down. 22kHz Generation The ZLPM8012 includes a 22kHz tone generator that can be used for LNB band switching or DiSEqC signalling. The tone frequency is user adjustable over the range 12kHz to 50kHz, set by a capacitor-resistor network connected to pin Tosc. Alternately, the RC network can be omitted 2 and an external tone source can be applied via the Tosc pin instead. Tone on/off is controlled using the I C or an independent logic pin Ten. When the tone generator is enabled the tone generated is modulated on the DC output of the LDOR via the pin V . OUT Internal 3.3V Supply Availability An internal 3.3V regulated supply is made available on the Creg pin to be utilised by other systems within the set-top box. Care should be taken that any load applied here should not exceed the limit quoted in the Specifications table and also that the total power dissipation limit of the ZLPM8012 is also observed. 2 System Control and Features Using I C 2 To minimise STB micro-controller IO pin requirements, I C is used as the primary control interface for the ZLPM8012, providing bi-directional 2 information exchange containing a range of control signals, DiSEqC data and diagnostics. ZLPM8012 features controlled via the I C bus include output enable, polarisation selection, regional selection Standard/Japanese, output voltage trim covering the range of 10.25V to 19.5V in 0.25V steps, V rise and fall time, tone on and current limit adjustment. Diagnostic information available includes over-temperature shutdown, over- OUT current shutdown, over-current shutdown, output not-in regulation, short on V line, remote tone present and under-voltage lockout. The active OUT 2 2 I C address of the IC is user selected from one of four possible addresses, allowing re-use of the I C bus without address conflicts and hence further minimising micro-controller IO requirements. System Control Using Logic 2 To further increase STB system design flexibility a logic tone enable pin is provided in addition to I C control. 2 of 17 ZLPM8012 July 2019 Diodes Incorporated www.diodes.com Document number: DS35980 Rev. 3 - 3