def _set_vout(self, target_vout):
if not isinstance(target_vout, Voltage):
target_vout = Voltage(target_vout)
rfb1_dev = self.get_elem_by_idx('RFB1').data['device']
rfb1_fp = self.get_elem_by_idx('RFB1').data['footprint']
rfb2_dev = self.get_elem_by_idx('RFB2').data['device']
rfb2_fp = self.get_elem_by_idx('RFB2').data['footprint']
if rfb1_fp[0:3] == "MY-":
rfb1_fp = rfb1_fp[3:]
if rfb2_fp[0:3] == "MY-":
rfb2_fp = rfb2_fp[3:]
allowed_rfb1_vals = iec60063.gen_vals(self._configdict['Rseries'],
iec60063.res_ostrs,
start='8.2K',
end='10K')
allowed_rfb2_vals = iec60063.gen_vals(self._configdict['Rseries'],
iec60063.res_ostrs,
self._configdict['Rmin'],
self._configdict['Rmax'])
allowed_rfb1_vals = [x for x in allowed_rfb1_vals]
allowed_rfb2_vals = [x for x in allowed_rfb2_vals]
best_match = None
for pair in itertools.product(allowed_rfb1_vals, allowed_rfb2_vals):
vout = self._get_Vout(*pair)
error = abs(vout - target_vout)
if best_match is None or error < best_match[1]:
best_match = (vout, error, pair[0], pair[1])
rfb1_value = gsymlib.find_resistor(best_match[2], rfb1_fp, rfb1_dev)
self.get_elem_by_idx('RFB1').data['value'] = rfb1_value
rfb2_value = gsymlib.find_resistor(best_match[3], rfb2_fp, rfb2_dev)
self.get_elem_by_idx('RFB2').data['value'] = rfb2_value
def _autoset_ilim(self):
rlim_dev = self.get_elem_by_idx('RLIM').data['device']
rlim_fp = self.get_elem_by_idx('RLIM').data['footprint']
icl = self.Iout * Decimal(1.2 - 0.33)
self.target_rlim = (icl / Current('85uA')) * self.fet_Rdson
allowed_rlim_vals = iec60063.gen_vals(self._configdict['Rseries'],
iec60063.res_ostrs,
self._configdict['Rmin'],
self._configdict['Rmax'])
best_match = None
for r in allowed_rlim_vals:
r = Resistance(r)
if r > self.target_rlim:
if best_match is None or r < best_match:
best_match = r
rlim_value = gsymlib.find_resistor(best_match, rlim_fp, rlim_dev)
self.get_elem_by_idx('RLIM').data['value'] = rlim_value
def _autoset_fsw(self):
ron_dev = self.get_elem_by_idx('RON').data['device']
ron_fp = self.get_elem_by_idx('RON').data['footprint']
self.d_min = DutyCycle(
100 * self.Vout / self.Vin_max
)
self.d_max = DutyCycle(
100 * self.Vout / self.Vin_min
)
self.ton_min = TimeSpan(self._configdict['Ton_min'])
self.fs_max_ontime = self.d_min / self.ton_min
self.toff_min = TimeSpan(self._configdict['Toff_min']) + \
TimeSpan(self._configdict['Toff_fet'])
self.fs_max_offtime = (1 - self.d_max.value / 100) / self.toff_min
self.fs_max = Percentage('80%') * min([self.fs_max_ontime, self.fs_max_offtime]) # noqa
self.target_ron = Resistance(
self.Vout.value / (Charge('100pC').value * self.fs_max.value)
)
allowed_ron_vals = iec60063.gen_vals(self._configdict['Rseries'],
iec60063.res_ostrs,
self._configdict['Rmin'],
self._configdict['Rmax'])
best_match = None
for r in allowed_ron_vals:
fsw = self._get_fsw(r)
if self.fs_max > fsw:
if best_match is None or fsw > best_match[0]:
best_match = (fsw, r)
ron_value = gsymlib.find_resistor(best_match[1], ron_fp, ron_dev)
self.get_elem_by_idx('RON').data['value'] = ron_value
def jb_harmonize(item):
ident = ident_transform(item.data['device'], item.data['value'],
item.data['footprint'])
prefix = check_for_std_val(ident)
if not prefix:
return item
else:
if item.data['footprint'].startswith('MY-'):
item.data['footprint'] = item.data['footprint'][3:]
context = {
'device': item.data['device'],
'footprint': item.data['footprint']
}
if prefix == 'RES':
params = parse_resistor(item.data['value'], context)
from tendril.gedaif.gsymlib import find_resistor
from tendril.gedaif.gsymlib import NoGedaSymbolException
try:
resistor = find_resistor(item.data['device'],
item.data['footprint'],
**params._asdict())
item.data['value'] = resistor.value
except NoGedaSymbolException:
pass
return item
elif prefix == 'CAP':
params = parse_capacitor(item.data['value'], context)
from tendril.gedaif.gsymlib import find_capacitor
from tendril.gedaif.gsymlib import NoGedaSymbolException
try:
capacitor = find_capacitor(item.data['device'],
item.data['footprint'],
**params._asdict())
item.data['value'] = capacitor.value
except NoGedaSymbolException:
pass
return item
else:
return item
def get_symbol(self, value, device=None, footprint=None):
from tendril.gedaif import gsymlib
if device is None:
device = self._device
if footprint is None:
footprint = self._footprint
if self._stype == 'resistor':
if isinstance(value, (str, Resistance)):
try:
return gsymlib.find_resistor(value, footprint, device)
except (gsymlib.NoGedaSymbolException, InvalidOperation):
pass
if self._stype == 'capacitor':
if isinstance(value, (str, Capacitance)):
try:
return gsymlib.find_capacitor(value, footprint, device)
except (gsymlib.NoGedaSymbolException, InvalidOperation):
pass
ident = electronics.ident_transform(device, value, footprint)
return gsymlib.get_symbol(ident)
def get_symbol(self, value, device=None, footprint=None):
from tendril.gedaif import gsymlib
if device is None:
device = self._device
if footprint is None:
footprint = self._footprint
# TODO Handle other parameters such as wattage, voltage
if self._stype == 'resistor':
if isinstance(value, (str, Resistance)):
try:
return gsymlib.find_resistor(device, footprint, value)
except (gsymlib.NoGedaSymbolException, InvalidOperation):
pass
if self._stype == 'capacitor':
if isinstance(value, (str, Capacitance)):
try:
return gsymlib.find_capacitor(device, footprint, value)
except (gsymlib.NoGedaSymbolException, InvalidOperation):
pass
ident = electronics.ident_transform(device, value, footprint)
return gsymlib.get_symbol(ident)