MC33067P datasheet(9/16 Pages) ONSEMI

No de pièce	MC33067P

Description	HIGH PERFORMANCE ZERO VOLTAGE SWITCH RESONANT MODE CONTROLLERS

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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.

Numéro de pièce similaire - MC33067P

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