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TDA16831-TDA16833-TDA16833G
Off-line SMPS Controller with 600 V Sense CoolMOS on Board
Off-line SMPS Controller with
600 V Sense CoolMOS on Board
TDA16831-4
Preliminary DataCoolSET
Overview
FeaturesPWM controller + sense CoolMOS
attached in one compact package600 V avalanche rugged CoolMOS
Typical RDSon = 0.5 ... 3.5 Ω at Tj = 25 °COnly 4 active PinsStandard DIP-8 Package for
Output Power ≤40 WOnly few external components requiredLow start up currentCurrent mode controlInput Undervoltage LockoutMax. Duty Cycle limitationThermal ShutdownModulated Gate Drive for low EMI
TA = 70 °C
Pin Configurations
Figure1TDA16831/2/3/4
P-DIP-8-6 for Applications with Pout ≤ 40 W: TDA16831/2/3/4
Figure2TDA16831G/2G/3G
P-DSO-14-11 for Applications with Pout ≤ 20 W: TDA
16831G/2G/3G
Circuit Description
The TDA 16831-4 is a current mode pulse
width modulator with integrated sense
CoolMOS transistor. It fulfills the
requirements of minimum external control
circuitry for a flyback application.
Current mode control means that the
current through the MOS transistor is
compared with a reference signal derived
from the output voltage of the flyback
application. The result of that comparison
determines the on time of the MOS
transistor.
To minimize external circuitry the sense
resistor which gives information about
MOS current is integrated. The oscillator
resistor and capacitor which determine the
switching frequency are integrated, too.
Special efforts have been made to
compensate temperature dependency and
to minimize tolerances of this resistor.
The circuit in detail: (see Figure3)
Start Up Circuit (uvlo)
Uvlo is monitoring the external supply
voltage VCC. When VCC is exceeding the on
threshold VCCH = 12 V, the bandgap, the
bias circuit and the soft start circuit are
switched on. When VCC is falling below the
off-threshold VCCL = 9 V the circuit is
switched off. During start up the current
consumption is about 30 μA.
Bandgap (bg)
The bandgap generates an internal very
accurate reference voltage of 5.5 V to
supply the internal circuits.
Current Source (bias)
The bias circuit provides the internal
Oscillator (osc)
The oscillator is generating a frequency
twice the switching frequencyswitch=100kHz. Resistor, capacitor and
current source which determine the
frequency are integrated. The charging
and discharging current of the
implemented oscillator capacitor is
internally trimmed, in order to achieve a
very accurate switching frequency.
Temperature coefficient of switching
frequency is very low ( see page 19).
Divider Flip Flop (tff)
Tff is a flip flop which divides the oscillator
frequency by one half to create the
switching frequency. The maximum duty
cycle is set to Dmax=0.5.
Current Sense Amplifier (pwmop)
The positive input of the pwmop is applied
to the internal sense resistor. With the
internal sense resistor (Rsense) the sensed
current coming from the CoolMOS is
converted into a sense voltage. The sense
voltage is amplified with a gain of 32dB.
The amplified sense voltage is connected
to the negative input of the pwm
comparator. Each time when the CoolMOS
transistor is switched on, a current spike is
superposed to the true current information.
To eliminate this current spike the sense
voltage is smoothed via an internal resistor
capacitor network with a time constant ofd1 = 100 ns. This is the first leading edge
blanking and only a small spike is left. To
reduce this small spike the current sense
amplifier is creating a virtual ramp at the
output. This is done by a second resistor
capacitor network with Td2 = 100 ns and an
op-offset of 0.8 V which is seen at the
switched off the output capacitor is
discharged via pulse signal pwmpls. The
oscillator signal slogpwm sets the RS-flip-
flop. The gate drive circuit is switched on,
when capacitor voltage exceeds the
internal threshold of 0.4 V. This leads to a
linear ramp, which is created by the output
of the amplifier. Therefore duty cycle of% is possible. The amplifier is
compensated through an internal compen-
sation network.
The transfer function of the amplifier can
be described as
the step response is described with
Comparator (pwmcomp)
The comparator pwmcomp compares the
amplified current signal pwmrmp of the
CoolMOS with the reference signal pwmin.
Pwmin is created by an external
optocoupler or external transistor and
gives the information of the feedback
circuitry. When the pwmrmp exceeds the
reference signal pwmin the comparator
switches the CoolMOS off.
Logic (logpwm)
The logic logpwm comprises a RS-flip-flop
and a NAND-gate. The NAND-gate
insures that CoolMOS transistor is only
switched on when sosta is on and pwmin
has exceeded minimum threshold and
pwmin is below pwmrmp and
currentshutdown is off and tempshutdown
is off and tff sets the starting impulse.
CoolMOS transistor is switched off when
pwmrmp exceeds pwmin or duty cycle
exceeds 0.5 or pwmcs exceeds Imax or
silicium temperature exceeds Tmax or uvlo
is going below threshold. The RS flip flop
ensures that with every frequency period
only one switch on can occur (double pulse
suppression).
Gate Drive (gtdrv)
Gtdrv is the driver circuit for the CoolMOS
and is optimized to minimize EMI
influences and to provide high circuit
efficiency. This is done by smoothing the
switch on slope when reaching the
CoolMOS threshold. Leading switch on
spike is minimized then. When CoolMOS
is witched off, the falling slope of the gate
driver is slowed down when reaching 2V.
So an overshoot below ground can't occur.
Also gate drive circuit is designed to
eliminate cross conduction of the output
stage.
Current Shut Down (cssd)
Current shut down circuit switches the
CoolMOS immediately off when the sense
current is exceeding an internal threshold
of 100 mV at Rsense.oi-----Ki1Tp×+()×------------------------------------ p;jω==oViKi×=tonT–Teon----------×+�����×i40on----=850 ns=
Tempshutdown (tsd)
Tempshutdown switches the CoolMOS off
when junction temperature of the PWM
controller is exceeding an internal
threshold.
Electrical Characteristics Be aware that VCC capacitor is discharged before IC is plugged into the application board. Power dissipation should be observed.
Absolute Maximum Ratings
Operating Range
Supply Section
-25 °C < Tj < 120 °C, VCC = 15 V
Oscillator Section
-25 °C < Tj < 120 °C, VCC = 15 V
