ics for tv 1 an5765 crt heater voltage control ic n overview the an5765 is an ic for crt heater voltage control. the incorporation of 4 values of heater voltage change- over 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. n features incorporating 4 values changeover output circuit incorporating 5 v constant voltage output incorporating reset function incorporating current protection and thermal protection circuit n applications crt monitors hsip007-p-0000 unit: mm n block diagram (7.80) (6.40) 7 r1.80 0.60 (4.20) 1 (1.20) (1.00) (0.30) (0.83) 2.54 0.60 0.10 1.45 0.20 1.80 0.20 3.50 0.30 0.35 +0.10 C0.05 (3.80) (3.80) 15.30 0.20 (17.10) 1.20 0.10 7.70 0.20 22.00 0.30 16.90 0.30 f 3.60 0.10 12.50 0.10 2.80 0.10 v cc 1 sw input 2 5 v 3 gnd 4 reset output 5 6 heater output 7 switch reset thermal protect regulator voltage regulator voltage
an5765 ics for tv 2 parameter symbol range unit supply voltage v cc 7.5 to 11.0 v sw input v 2 - 4 0 to v 3 v regulator output maximum output current i 3max - 400 to + 0.1 ma heater output maximum output current i 7max - 1 000 to + 0.05 ma n recommended operating range n pin descriptions pin no. description 1v cc 2 sw input 3 regulator output (5 v) 4 gnd 5 reset output 6 capacitor for delay 7 heater output parameter symbol rating unit supply voltage v cc 12.0 v supply current i cc 2 000 ma power dissipation * 2 p d 1 400 mw operating ambient temperature * 1 t opr - 20 to + 75 c storage temperature * 1 t stg - 55 to + 150 c n absolute maximum ratings note) * 1: except for the operating ambient temperature and storage temperature, all ratings are for t a = 25c. * 2: the power dissipation shown is for the ic package at t a = 75c. note) fin has the same potential as gnd note) ' + ' denotes current flowing into the ic, and ' - ' denotes current flowing out of the ic. n electrical characteristics at t a = 25 c parameter symbol conditions min typ max unit circuit current pin 1 i cc v cc = 8 v, load (r3, r7) open 2 4.5 7 ma circuit voltage pin 2 v 2 - 4 v cc = 8 v, r3 = 1 k w , r7 = 500 w 1.7 2.0 2.3 v circuit voltage pin 3 v 3 - 4 v cc = 8 v, r3 = 1 k w , r7 = 500 w 4.75 5.0 5.15 v circuit voltage pin 5 v 5 - 4 v cc = 8 v, r3 = 1 k w , r7 = 500 w 4.75 5.0 5.15 v circuit voltage pin 7 v 7 - 4 v cc = 8 v, r3 = 1 k w , r7 = 500 w 4.25 4.5 4.75 v heater output off voltage v 7 - 4off v cc = 8 v, v 2 = 0 v, 0 ? 0.1 v r3 = 1 k w , r7 = 500 w
ics for tv an5765 3 n electrical characteristics at t a = 25 c (continued) parameter symbol conditions min typ max unit regulator output voltage v 3rl v cc = 8 v, r3 = 20 w , r7 = 10 w 4.7 5.0 5.1 v heater output voltage high v 7hi v cc = 8 v, v 2 = 5 v, 6.15 6.40 6.65 v r3 = 20 w , r7 = 10 w heater output voltage mid. v 7mid v cc = 8 v, v 2 = 3 v, 4.95 5.2 5.45 v r3 = 20 w , r7 = 10 w heater output voltage low v 7lo v cc = 8 v, v 2 = 2 v, 4.25 4.5 4.75 v r3 = 20 w , r7 = 10 w heater output voltage off v 7off v cc = 8 v, v 2 = 0 v, 0 ? 0.1 v r3 = 20 w , r7 = 10 w delay capacitor discharge current i 6c v cc = 5.0 v, v 6 = 1 v 1 5 ? ma delay capacitor charge current i 6d v cc = 6.0 v, v 6 = 1 v - 15 - 8.5 - 4 m a reset output voltage low v 5lo v cc = 8 v, v 6 = 3.3 v 0 ? 0.15 v reset output voltage high v 5hi v cc = 8 v, v 6 = 4.5 v 4.7 5.0 5.1 v pin no. equivalent circuit description 1v cc : power supply pin dc 8 v (typ.) application 2 sw input: sw input pin for changing over heater output (pin 7) voltage changeover from dc 0 v to 5 v n terminal equivalent circuits design reference data note) the characteristics listed below are theoretical values based on the ic design and are not guaranteed. parameter symbol conditions min typ max unit heater output operation start v op7 v cc voltage at which v 7 becomes 0 v 6.1 6.35 6.5 v supply voltage to 4.5 v. delay capacitor charge start v op3 regulator voltage at which pin 6 4.4 4.6 4.8 v regulator voltage becomes low to high. delay capacitor discharge start v of3 regulator voltage at which pin 6 3.9 4.1 4.3 v regulator voltage becomes high to low. reset output operation stop v off3 regulator voltage at which pin 5 3.9 4.1 4.3 v regulator voltage becomes high to low. 1 v cc 2 3 20 k w 30 k w v cc 200 w
an5765 ics for tv 4 n terminal equivalent circuits (continued) pin no. equivalent circuit description 3 regulator output: 5 v constant voltage output dc 5 v 4gnd: gnd (grounding) pin fin is also in the same potential. 0 v 5 reset output: pin for reset output pin voltage becomes high at regulator output (pin 3) 4.6 v or more. 6 capacitor for delay: capacitor pin for reset output delay approx. 50 ms delay with c = 0.1 m f connection 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 0 v ? 0 v 3 10 k w v cc 4 5 3 10 k w v cc 200 w 5 v 0 v 6 200 w v cc 5 v 8.5 m a 5 v 0 v 50 ms 7 v cc
ics for tv an5765 5 2. main characteristics 1) heater output voltage control characteristic 2) supply voltage characteristics (typical value) (typical value) 3) timing relationship of regulator output voltage vs. reset output n technical information 1. p d ? t a curves of hsip007-p-0000 p d ? t a 0.000 2.350 0 25 50 75 100 125 150 power dissipation p d (w) ambient temperature t a ( c) 5.000 15.000 10.000 20.000 25.000 30.000 31.250 35.000 infinite heat sink r th (j-c) = 4.0 c/w independent ic without a heat sink r th (j-a) = 53.2 c/w sw input voltage v 2 (v) heater output voltage v 7 (v) 01 0 4.5 5.2 6.45 2 3 4 5 (pin 3 - pin 2, short) v cc voltage v 1 (v) v 7 each output voltage (v) 02 0 5 6.45 4 6 8 10 v 3 v 5 t delay 4.6 v pin 3 pin 6 pin 5 4.1 v time
an5765 ics for tv 6 n technical information (continued) 3. operational explanation 1) temperature protection circuit is built in. the circuit operates at approx. 150 c (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 re- turns to the high-level again. 2) pin 3 and pin 7 are equipped with current limiter circuit. the limiter circuit operates at; i 3 - 400 ma i 7 - 1 000 ma the current value is not guaranteed value since the value fluctuates due to dispersion and temperature characteristic. 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 w 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. 4) the reset output becomes low (0.15 v or less) by pin 3 voltage (at v 3 4.1 v). if v cc 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. v 7 0 v 150 c 6.45 v t j v 3 0 v - 400 ma 5 v i 3 v 7 0 v - 1 000 ma 6.45 v i 7 30 k w 3 2 5 v 3 v ic inside 20 k w to microcomputer 22 k w open 0 v v cc (pin 1) regulator (pin 3) reset (pin 5) (when pin 3 turns off first) 0 v 0.7 v v cc (pin 1) regulator (pin 3) reset (pin 5) (when v cc turns off first)
ics for tv an5765 7 n application example 1. application system example 2. application circuit example an5765 an5764 microcomputer v dd sw h - dy reset heater horizontal drive horizontal position adjustment v cc gnd 0.1 m f 8 v 1 3 2 open sw 10 m f 0.1 m f heater 100 m f 1 2 3 4 5 6 7 switch reset thermal protect regulator voltage regulator voltage
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