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TEA1566J 数据表(PDF) 7 Page - NXP Semiconductors

部件名 TEA1566J
功能描述  GreenChip; SMPS module
Download  24 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TEA1566J 数据表(HTML) 7 Page - NXP Semiconductors

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1999 Apr 20
7
Philips Semiconductors
Preliminary specification
GreenChip
™; SMPS module
TEA1566
Multi frequency control
The oscillator is also capable of working at a lower
frequency (see fosc-l in Chapter “Characteristics”). A ratio
of 1 : 2.5 is maintained between high and low frequency of
the oscillator. Low frequency operation is invoked if the
power supply is working at or below one ninth of its peak
power. By working at a lower frequency, the switching
losses in the power supply are reduced. A novel scheme
is used to ensure that the transfer of high to low frequency
and vice versa has no effect on the regulation of the output
voltage.
Gate driver
The gate driver has a totem-pole output stage that has
current sourcing capability of 120 mA and a current sink
capability of 550 mA. This is to enable fast turn on and turn
off of the power device for efficient operation.
A lower driver source current has been chosen in order to
limit the
∆V/∆t at switch-on. This is advantageous for EMI
(ElectroMagnetic Interference) and reduces the current
spike across Rsense.
Demagnetization protection
This feature guarantees discontinuous conduction mode
operation for the power supply which simplifies the design
of feedback control and gives faster transient response.
Demagnetization protection is an additional protection
feature that protects against saturation of the
transformer/inductor. Demagnetization protection also
protects the power supply components against excessive
stresses at start-up, when all energy storage components
are completely discharged. The converter is cycle by cycle
protected during shorted output system fault condition due
to the demagnetization protection. The value of the
demagnetization resistor (Rdem) can be calculated with the
formula given in Section “Sample and hold”.
Negative clamp
The negative clamp circuit does not let the voltage on
pin Dem go below
−0.4 V, when the auxiliary winding
voltage goes negative during the time that the power
device is turned on, to ensure correct operation of the IC.
Over voltage protection
An Over Voltage Protection (OVP) mode has been
implemented in the GreenChip
™ series. This circuit works
by sensing the Vaux voltage. If the output voltage exceeds
the preset voltage limit, the OVP circuit turns off the power
MOSFET. With no switching of the power device, the Vaux
capacitor is not re-supplied and discharges to UVLO level
and the system goes into the low dissipation safe-restart
mode described earlier. The system recovers from the
safe-restart mode only if the OVP condition is removed.
Over current protection
Cycle by cycle Over Current Protection (OCP) is provided
by sensing the voltage on an external resistor which is
connected to the source of the power MOSFET.
The voltage on the current sense resistor, which reflects
the amplitude of the primary current, is compared
internally with a reference voltage using a high speed
comparator. This threshold voltage is specified as Vth(Imax)
in the chapter “Characteristics”. The maximum primary
(protection) current is therefore:
[A]
If the power device current exceeds the current limit, the
comparator trips and turns off the power device.
The power device is typically turned off in 210 ns
(see tD in Chapter “Characteristics”).
The availability of the current sense resistor off-chip for
programming the OCP trip level increases design flexibility
for the power supply designer. An off-chip current sense
resistor also reduces the risk of an OCP condition being
sensed incorrectly. At power MOSFET turn-on the
∆V/∆t limiters capacitance discharge current does not
have to flow through the sense resistor, because this
capacitor can be connected between drain and source of
the power MOSFET directly.
The Leading Edge Blanking (LEB) circuit works together
with the OCP circuit and inhibits the operation of the OCP
comparator for a short duration (see tLEB in
Chapter “Characteristics”) when the power device is
turned on. This ensures that the power device is not turned
off prematurely due to false sensing of an OCP condition
because of current spikes caused by discharge of
primary-side snubber and parasitic capacitances.
LEB time is not fixed and it tracks the oscillator frequency.
I
prot
V
th Imax
()
R
sense
------------------------
=


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