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| ICs for TV AN5765 CRT heater voltage control IC s Overview The AN5765 is an IC for CRT heater voltage control. The incorporation of 4 values of heater voltage changeover output circuit, 5 V power supply and reset circuit for microcomputer, and the adoption of SIP 7-pin package with fin can realize the rationalization and power saving of the set. (4.20) 0.60 (17.10) 15.300.20 (3.80) (3.80) 3.600.10 (6.40) Unit: mm 1.200.10 R1.80 2.800.10 12.500.10 7.700.20 1 (1.00) (7.80) s Features * Incorporating 4 values changeover output circuit * Incorporating 5 V constant voltage output * Incorporating reset function * Incorporating current protection and thermal protection circuit (0.83) 2.54 0.60 7 (0.30) 1.450.20 22.000.30 1.800.20 0.35 +0.10 -0.05 3.500.30 0.10 (1.20) s Applications * CRT monitors 16.900.30 HSIP007-P-0000 s Block Diagram Regulator voltage Thermal protect Switch Regulator voltage Reset 1 4 5 6 2 3 Heater output GND Reset output SW input VCC 5V 7 1 AN5765 s Pin Descriptions Pin No. 1 2 3 4 5 6 7 VCC SW input Regulator output (5 V) GND Reset output Capacitor for delay Heater output Description ICs for TV Note) Fin has the same potential as GND s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 *1 Symbol VCC ICC PD Topr Tstg Rating 12.0 2 000 1 400 -20 to +75 -55 to +150 Unit V mA mW C C Operating ambient temperature Storage temperature *1 Note) *1: Except for the operating ambient temperature and storage temperature, all ratings are for Ta = 25C. *2: The power dissipation shown is for the IC package at Ta = 75C. s Recommended Operating Range Parameter Supply voltage SW input Regulator output maximum output current Heater output maximum output current Symbol VCC V2-4 I3max I7max Range 7.5 to 11.0 0 to V3 -400 to +0.1 -1 000 to +0.05 Unit V V mA mA Note) '+' denotes current flowing into the IC, and '-' denotes current flowing out of the IC. s Electrical Characteristics at Ta = 25C Parameter Circuit current pin 1 Circuit voltage pin 2 Circuit voltage pin 3 Circuit voltage pin 5 Circuit voltage pin 7 Heater output off voltage Symbol ICC V2-4 V3-4 V5-4 V7-4 Conditions VCC = 8 V, load (R3, R7) open VCC = 8 V, R3 = 1 k, R7 = 500 VCC = 8 V, R3 = 1 k, R7 = 500 VCC = 8 V, R3 = 1 k, R7 = 500 VCC = 8 V, R3 = 1 k, R7 = 500 Min 2 1.7 4.75 4.75 4.25 0 Typ 4.5 2.0 5.0 5.0 4.5 Max 7 2.3 5.15 5.15 4.75 0.1 Unit mA V V V V V V7-4OFF VCC = 8 V, V2 = 0 V, R3 = 1 k, R7 = 500 2 ICs for TV s Electrical Characteristics at Ta = 25C (continued) Parameter Regulator output voltage Heater output voltage high Heater output voltage mid. Heater output voltage low Heater output voltage off Delay capacitor discharge current Delay capacitor charge current Reset output voltage low Reset output voltage high * Design reference data Note) The characteristics listed below are theoretical values based on the IC design and are not guaranteed. AN5765 Symbol V3RL V7HI V7MID V7LO V7OFF I6C I6D V5LO V5HI Conditions VCC = 8 V, R3 = 20 , R7 = 10 VCC = 8 V, V2 = 5 V, R3 = 20 , R7 = 10 VCC = 8 V, V2 = 3 V, R3 = 20 , R7 = 10 VCC = 8 V, V2 = 2 V, R3 = 20 , R7 = 10 VCC = 8 V, V2 = 0 V, R3 = 20 , R7 = 10 VCC = 5.0 V, V6 = 1 V VCC = 6.0 V, V6 = 1 V VCC = 8 V, V6 = 3.3 V VCC = 8 V, V6 = 4.5 V Min 4.7 6.15 4.95 4.25 0 1 -15 0 4.7 Typ 5.0 6.40 5.2 4.5 5 -8.5 5.0 Max 5.1 6.65 5.45 4.75 0.1 -4 0.15 5.1 Unit V V V V V mA A V V Parameter Heater output operation start supply voltage Delay capacitor charge start regulator voltage Delay capacitor discharge start regulator voltage Reset output operation stop regulator voltage Symbol VOP7 VOP3 VOF3 VOFF3 Conditions VCC voltage at which V7 becomes 0 V to 4.5 V. Regulator voltage at which pin 6 becomes low to high. Regulator voltage at which pin 6 becomes high to low. Regulator voltage at which pin 5 becomes high to low. Min 6.1 4.4 3.9 3.9 Typ 6.35 4.6 4.1 4.1 Max 6.5 4.8 4.3 4.3 Unit V V V V s Terminal Equivalent Circuits Pin No. 1 Equivalent circuit Description VCC: Power supply pin DC 8 V (typ.) application SW input: SW input pin for changing over heater output (pin 7) voltage Changeover from DC 0 V to 5 V 1 VCC 2 VCC 30 k 2 200 20 k 3 3 AN5765 s Terminal Equivalent Circuits (continued) Pin No. 3 Equivalent circuit VCC Description Regulator output: 5 V constant voltage output DC 5 V 10 k ICs for TV 3 4 4 GND: GND (grounding) pin Fin is also in the same potential. 0V 5 VCC 3 10 k 5 200 Reset output: Pin for reset output Pin voltage becomes high at regulator output (pin 3) 4.6 V or more. 5V 0V 6 VCC 5V 8.5 A 6 200 Capacitor for delay: Capacitor pin for reset output delay Approx. 50 ms delay with C = 0.1F connection 5V 0V 50 ms 7 VCC 7 Heater output: Constant voltage output pin for heater Voltage can be changed over by SW input (pin 2). DC Pin 2 Pin 7 5 V 6.5 V 3 V 5.2 V 2 V 4.5 V 0V 0V 4 ICs for TV s Technical Information 1. PD Ta curves of HSIP007-P-0000 PD T a 35.000 31.250 30.000 Infinite heat sink Rth (j-c) = 4.0C/W AN5765 Power dissipation PD (W) 25.000 20.000 15.000 10.000 Independent IC without a heat sink Rth (j-a) = 53.2C/W 5.000 2.350 0.000 0 25 50 75 100 125 150 Ambient temperature Ta (C) 2. Main characteristics 1) Heater output voltage control characteristic (typical value) Heater output voltage V7 (V) 6.45 5.2 4.5 2) Supply voltage characteristics (typical value) (Pin 3-pin 2, short) V7 Each output voltage (V) 6.45 V3 5 V5 0 0 1 2 3 4 5 0 0 2 4 6 8 10 SW input voltage V2 (V) VCC voltage V1 (V) 3) Timing relationship of regulator output voltage vs. reset output 4.6 V 4.1 V Pin 3 Pin 6 tdelay Pin 5 Time 5 AN5765 s Technical Information (continued) 3. Operational explanation 1) Temperature protection circuit is built in. The circuit operates at approx. 150C (typ.) and pin 7 output becomes low-level (0 V). If the temperature falls due to the output current decrease, the protection circuit turns off and pin 7 returns to the high-level again. 2) Pin 3 and pin 7 are equipped with current limiter circuit. The limiter circuit operates at; I3 -400 mA I7 -1 000 mA The current value is not guaranteed value since the value fluctuates due to dispersion and temperature characteristic. V3 5V ICs for TV V7 6.45 V 0V 150C Tj V7 6.45 V 0V -400 mA I3 0V -1 000 mA I7 3) Pin 2 (SW input) is internally biased. Pin 2 is biased at approx. 2 V when open. Pin 2 can be biased at approx. 3 V if 22 k resistor is connected between pin 2 and pin 3 (5 V). However, take sufficient care to its absolute value fluctuation since the built-in resistor of IC has its dispersion and temperature dependency. IC inside To microcomputer 22 k 5V 3 3V 2 30 k 20 k Open 4) The Reset output becomes Low (0.15 V or less) by pin 3 voltage (at V3 4.1 V). If VCC is turned off prior to regulator output, regulator output once becomes high (0.7 V) at a voltage of 0.7 V or less but there is no problem in terms of characteristics. VCC (pin 1) Regulator (pin 3) Reset (pin 5) VCC (pin 1) Regulator (pin 3) Reset (pin 5) 0V (When pin 3 turns off first) (When VCC turns off first) 0.7 V 0V 6 ICs for TV s Application Example 1. Application system example AN5765 VDD Microcomputer Reset SW AN5765 Heater H-DY Horizontal position adjustment AN5764 Horizontal drive 2. Application circuit example Regulator voltage Thermal protect Switch Regulator voltage Reset VCC 1 2 3 GND 4 5 6 8V 100 F 0.1 F 7 Heater 0.1 F 31 2 Open SW 10 F 7 |
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