VIPer12AS ,LOW POWER OFF LINE SMPS PRIMARY SWITCHERBLOCK DIAGRAMDRAINON/OFF60kHzOSCILLATORREGULATORPWMINTERNALSLATCHSUPPLYOVERTEMP.FFR1QDETECTORR2 R3 ..
VIPER12AS-E ,Fixed frequency off line converterapplications cover off line power supplies protection with auto-restartfor battery charger adapters ..
VIPER12ASTR-E ,Fixed frequency off line converterElectrical characteristicsT = 25 °C, V = 18 V, unless otherwise specifiedJ DD Table 3. Power sectio ..
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VIPER12ADIP-VIPer12AS
LOW POWER OFF LINE SMPS PRIMARY SWITCHER
September 2002 1/15
VIPer12ADIP
VIPer12ASLOW POWER OFF LINE SMPS PRIMARY SWITCHER
TYPICAL POWER CAPABILITY FIXED 60 KHZ SWITCHING FREQUENCY 9V TO 38V WIDE RANGE VDD VOLTAGE CURRENT MODE CONTROL AUXILIARY UNDERVOLTAGE LOCKOUT
WITH HYSTERESIS HIGH VOLTAGE START UP CURRENT
SOURCE OVERTEMPERATURE, OVERCURRENT AND
OVERVOLTAGE PROTECTION WITH
AUTORESTART
DESCRIPTIONThe VIPer12A combines a dedicated current mode
PWM controller with a high voltage Power
MOSFET on the same silicon chip. Typical
applications cover off line power supplies for
battery charger adapters, standby power supplies
for TV or monitors, auxiliary supplies for motor
control, etc. The internal control circuit offers the
following benefits: Large input voltage range on the VDD pin
accommodates changes in auxiliary supply
voltage. This feature is well adapted to battery
charger adapter configurations. Automatic burst mode in low load condition. Overvoltage protection in hiccup mode.
BLOCK DIAGRAM
VIPer12ADIP / VIPer12AS
PIN FUNCTION
VIPer12ADIP / VIPer12AS
ABSOLUTE MAXIMUM RATINGSNote:1. This parameter applies when the start up current source is off. This is the case when the VDD voltage has reached VDDon and
remains above VDDoff. This parameter applies when the start up current source is on. This is the case when the VDD voltage has not yet reached VDDon
or has fallen below VDDoff.
THERMAL DATANote:1. When mounted on a standard single-sided FR4 board with 200 mm² of Cu (at least 35 μm thick) connected to all DRAIN pins.
ELECTRICAL CHARACTERISTICS (Tj=25°C, VDD=18V, unless otherwise specified)POWER SECTION
Note:1. On clamped inductive load
VIPer12ADIP / VIPer12AS
ELECTRICAL CHARACTERISTICS (Tj =25°C, VDD =18V, unless otherwise specified)
SUPPLY SECTION
Note:1. These test conditions obtained with a resistive load are leading to the maximum conduction time of the device.
OSCILLATOR SECTION
PWM COMPARATOR SECTION
OVERTEMPERATURE SECTION
Figure 1 : Rise and Fall Time
Figure 2 : Start Up VDD Current
Figure 3 : Restart Duty Cycle
VIPer12ADIP / VIPer12AS
Figure 4 : Peak Drain Current Vs. Feedback Current
Figure 5 : Thermal Shutdown
VIPer12ADIP / VIPer12AS
Figure 6 : Switching Frequency vs Temperature
Figure 7 : Current Limitation vs Temperature
VIPer12ADIP / VIPer12AS
Figure 8 : Rectangular U-I output characteristics for battery charger
RECTANGULAR U-I OUTPUT
CHARACTERISTICA complete regulation scheme can achieve
combined and accurate output characteristics.
Figure 8 presents a secondary feedback through
an optocoupler driven by a TSM101. This device
offers two operational amplifiers and a voltage
reference, thus allowing the regulation of both
output voltage and current. An integrated OR
function performs the combination of the two
resulting error signals, leading to a dual voltage
and current limitation, known as a rectangular
output characteristic.
This type of power supply is especially useful for
battery chargers where the output is mainly used in
current mode, in order to deliver a defined charging
rate. The accurate voltage regulation is also
convenient for Li-ion batteries which require both
modes of operation.
WIDE RANGE OF VDD VOLTAGEThe VDD pin voltage range extends from 9V to 38V.
This feature offers a great flexibility in design to
achieve various behaviors. In figure 8 a forward
configuration has been chosen to supply the
device with two benefits: as soon as the device starts switching, it
immediately receives some energy from the
auxiliary winding. C5 can be therefore reduced
and a small ceramic chip (100 nF) is sufficient to
insure the filtering function. The total start up
time from the switch on of input voltage to output
voltage presence is dramatically decreased. the output current characteristic can be
maintained even with very low or zero output
voltage. Since the TSM101 is also supplied in
forward mode, it keeps the current regulation up
whatever the output voltage is.The VDD pin
voltage may vary as much as the input voltage,
that is to say with a ratio of about 4 for a wide
range application.
