3.3 - 43 3.3 1 amp, 12 v, 15 v and adjustable output voltage versions in mo-078 metal package 4 11 r0 step-up switching voltage regulator in hermetic isolated package features ? similar to industry standard lm1577 series ? available in 12v, 15v and adjustable output voltage versions ? hermetic isolated packages ? requires few external components ? protection features current and thermal limitations ? hi-rel screened description these devices are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback and converter switching regulators. they are simple to use and cost effective as they only require a small number of external components for implementation. the chip incorporates a 3.0 amp npn switch and associated protection circuitry featuring current and thermal limitations and under voltage lockout. absolute maximum ratings (see note 1) input voltage, v in ...............................................................45 v output switch voltage, v switch ...................................................65 v output switch current, i switch (see note 2) ........................................ 6.0 a storage temperature range .......................................... -65c to + 150c junction temperature, t j ...................................................... +150c lead soldering temperature, (10 seconds) ....................................... 260c power dissipation, p d ................................................. internally limited thermal resistance: junction-to-case, q jc ............................................. 3.0c/w typically junction-to-ambient, q ja ................................................... 65c/w recommended operating conditions input voltage range, v in ................................................... 3.5 to 40 v ambient operating temperature range, t a ............................. -55c to + 125c output switch voltage range, v switch .........................................0 to 60 v output switch current, i switch .................................................. 3.0 a notes: 1. stresses above the absolute maximum rating may cause damage to the device. extended operation at the maximum levels may degrade performance and affect reliability. 2. output current cannot be internally limited when the device is used as a step-up regulator. to prevent damage to the switch, the current must be externally limited to 6.0 a. however, output current is internally limited when the device is used as a flyback or forward converter regulator. om1577 series
3.3 - 44 3.3 om1577 series electrical characteristics - om1577-12 -55c t a 125c, v in = 5v, i switch - 0a, v feedback = v ref unless otherwise specified. parameter symbol test conditions min. max. unit system parameters output voltage v out v in = 5v to 10v 11.60 12.40 i load = 100ma to 800ma ? 11.40 12.60 v line regulation 3v out v in = 3.5v to 10v 60 3v in i load = 300ma ? 120 mv load regulation 3v out v in = 5v 60 3i load i load = 100ma to 800ma ? 120 mv device parameters input supply current i s v feedback = 14v 14 (switch off) ? 18 i switch = 2.0a 60 ma v comp = 2.0 v, (max. duty cycle) ? 95 input supply v uv i switch = 100ma 2.70 3.10 under-voltage lockout ? 2.65 3.15 v reference voltage v ref measures at feedback pin v in = 3.5v to 40v 11.76 12.24 v comp = 1.0v ? 11.64 12.36 v error amplifier gm i comp = -30a to +30a 210 515 transconductance v comp = 1.0v ? 130 615 mho error amplifier a vol v comp = 1.1v to 1.9v 40 voltage gain r comp = 1.0m (note 1) ? 20 v/v error amplifier v feedback = 10.0v 2.1 5.0 output swing upper limit ? 1.9 5.0 v v feedback = 15.0v 0.45 lower limit ? 0.60 v error amplifier i eao v feedback = 10.0v to 15.0v 120 300 output current v comp = 0v ? 280 400 a soft start current i ss v feedback = 10.0v 2.2 7.5 v comp = 0v ? 7.0 9.5 a maximum duty cycle d c i switch = 100ma 93 v comp = 1.5 v ? 90 % switch leakage current i l v feedback = 15v -1.0 360 v switch = 65v, switch off ? -1.0 700 a switch saturation voltage v sat v comp = 2.0v .65 i switch = 2.0a (max. duty cycle) ? .85 v npn switch current limit v comp = 2.0v 3.5 5.3 ? 2.9 6.0 a oscillator frequency f o measured at switch pin, 48 56 i switch = 100ma ? 42 62 khz notes: the ? denotes the specifications which apply over the full operating temperature range. 1. a 1.0 m resistor is connected to the compensation pin (error amplifier output) to ensure accuracy in measuring a vol . in actual applications, the compensation pins load resistance should be 10 m , resulting in a vol that is typically twice the guaranteed minimum limit. 2. om1577-adj have the same test conditions as om1577-12 (see test circuit on page 3).
3.3 - 45 3.3 om1577 series electrical characteristics - om1577-15 -55c t a 125c, v in = 5v, i switch - 0a, v feedback = v ref unless otherwise specified. parameter symbol test conditions min. max. unit system parameters output voltage v out v in = 5v to 12v 14.50 15.50 i load = 100ma to 600ma ? 14.25 15.75 v line regulation 3v out v in = 3.5v to 12v 60 3v in i load = 300ma ? 120 mv load regulation 3v out v in = 5v 60 3v load i load = 100ma to 600ma ? 120 mv device parameters input supply current i s v feedback = 18v 14 (switch off) ? 18 i switch = 2.0a 60 ma v comp = 2.0 v, (max. duty cycle) ? 95 input supply v uv i switch = 100ma 2.70 3.10 under-voltage lockout ? 2.65 3.15 v reference voltage v ref measures at feedback pin v in = 3.5v to 40v 14.70 15.30 v comp = 1.0v ? 14.55 15.45 v error amplifier gm i comp = -30a to +30a 160 420 transconductance v comp = 1.0v ? 400 500 mho error amplifier a vol v comp = 1.1v to 1.9v 35 voltage gain r comp = 1.0m (note 1) ? 15 v/v error amplifier v feedback = 12.0v 2.1 5.0 output swing upper limit ? 1.9 5.0 v v feedback = 18.0v 0.45 lower limit ? 0.60 v error amplifier i eao v feedback = 12.0v to 18.0 v 120 300 output current v comp = 1.0v ? 280 400 a soft start current i ss v feedback = 12.0v 2.2 7.5 v comp = 0v ? 7.0 9.5 a maximum duty cycle d c i switch = 100ma 93 v comp = 1.5 v ? 90 % switch leakage current i l v feedback = 18v -1.0 360 v switch = 65v, switch off ? -1.0 700 a switch saturation voltage v sat v comp = 2.0v .65 i switch = 2.0a (max. duty cycle) ? .85 v npn switch current limit v comp = 2.0v 3.5 5.3 ? 2.9 6.0 a oscillator frequency f o measured at switch pin, 48 56 i switch = 100ma ? 42 62 khz notes: the ? denotes the specifications which apply over the full operating temperature range. 1. a 1.0 m resistor is connected to the compensation pin (error amplifier output) to ensure accuracy in measuring a vol . in actual applications, the compensation pins load resistance should be 10 m , resulting in a vol that is typically twice the guaranteed minimum limit.
3.3 - 46 3.3 om1577 series example: p/n OM1577-12SCM = 12 volt, c5 package with screening basic part voltage case number level style screening om1577 12 = 12 volt sc = c5 package add m 15 = 15 volt scz = c5s package for 883 a = adjustable both packages isolated screening ordering information om1577-12 test circuit +220 m f 0.1 m f +680 m f v in v in v out c out l1 100? d1 1n5821 10k dvm comp gnd fb switch 4 2 1 2k 0.33 m f 0.1 m f 3 120 w 60 w 24 w sw1 sw2 5 om1577-15 test circuit +220 m f 0.1 m f +680 m f v in v in v out c out l1 100? d1 1n5821 10k dvm comp gnd fb switch 4 5 2 1 3k 0.33 m f 0.1 m f 3 150 w 75 w 50 w sw1 sw2 om1577-a test circuit +220 m f 0.1 m f +680 m f v in v in v out c out l 1 100? d 1 1n5821 10k dvm comp gnd fb switch 4 5 2 r1 r2 1 2k 0.33 m f 0.1 m f 3 120 w 60 w 24 w sw1 sw2 circuit used to specify system parameters for 12 volt version. circuit used to specify system parameters for 15 volt version. circuit used to specify system parameters for adjustable voltage version.
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