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MC33067P Fiches technique(PDF) 9 Page - ON Semiconductor

No de pièce MC33067P
Description  HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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MC34067 MC33067
9
MOTOROLA ANALOG IC DEVICE DATA
Figure 17. Undervoltage Lockout and Reference
8.0V
Vref
15
9
VCC
5
Vref
4.2/4.0V
Vref UVLO
VCC UVLO
7.0k
50k
7.0k
50k
5.1V
Reference
Enable /
UVLO Adjust
UVLO
PERIPHERAL SUPPORT FUNCTIONS
The MC34067 Resonant Controller provides a number of
support and protection functions including a precision voltage
reference, undervoltage lockout comparators, soft–start
circuitry, and a fault detector. These peripheral circuits
ensure that the power supply can be turned on and off in a
controlled manner and that the system will be quickly
disabled when a fault condition occurs.
Undervoltage Lockout and Voltage Reference
Separate undervoltage lockout comparators sense the
input VCC voltage and the regulated reference voltage as
illustrated in Figure 17. When VCC increases to the upper
threshold voltage, the VCC UVLO comparator enables the
Reference Regulator. After the Vref output of the Reference
Regulator rises to 4.2 V, the Vref UVLO comparator switches
the UVLO signal to a logic zero state enabling the primary
control path. Reducing VCC to the lower threshold voltage
causes the VCC UVLO comparator to disable the Reference
Regulator. The Vref UVLO comparator then switches the
UVLO output to a logic one state disabling the controller.
The Enable/UVLO Adjust pin allows the power supply
designer to select the VCC UVLO threshold voltages. When
this pin is open, the comparator switches the controller on at
16 V and off at 9.0 V. If this pin is connected to the VCC
terminal, the upper and lower thresholds are reduced to
9.0 V and 8.6 V, respectively. Forcing the Enable/UVLO
Adjust pin low will pull the VCC UVLO comparator input low
(through an internal diode) turning off the controller.
The Reference Regulator provides a precise 5.1 V
reference to internal circuitry and can deliver up to 10 mA to
external loads. The reference is trimmed to better than 2%
initial accuracy and includes active short circuit protection.
Fault Detector
The high speed Fault Comparator illustrated in Figure 18
can protect a power supply from destruction under fault
conditions. The Fault Input pin connects to the input of the
Fault Comparator. The Fault Comparator output connects to
the output drivers. This direct path reduces the propagation
delay from the Fault Input to the A and B outputs to typically
70 ns. The Fault Comparator output is also OR’d with the
UVLO output from the Vref UVLO comparator to produce the
logic output labeled “UVLO+Fault”. This signal disables the
Oscillator and One–Shot by forcing both the COSC and CT
capacitors to be continually charged.
Figure 18. Fault Detector and Soft–Start
CSoft–Start
Fault
Input
10
9.0
µA
1.0V
11
6
Ground
Soft–Start
Buffer
Ea Clamp
UVLO + Fault
UVLO
Fault
Comparator
Soft–Start Circuit
The Soft–Start circuit shown in Figure 18 forces the
variable frequency Oscillator to start at the maximum
frequency and ramp downward until regulated by the
feedback control loop. The external capacitor at the
CSoft–Start terminal is initially discharged by the UVLO+Fault
signal. The low voltage on the capacitor passes through the
Soft–Start Buffer to hold the Error Amplifier output low. After
UVLO+Fault switches to a logic zero, the soft–start
capacitor is charged by a 9.0
µA current source. The buffer
allows the Error Amplifier output to follow the soft–start
capacitor until it is regulated by the Error Amplifier inputs. The
soft–start function is generally applicable to controllers
operating below resonance and can be disabled by simply
opening the CSoft–Start terminal.


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