MC33260PG ON Semiconductor, MC33260PG Datasheet - Page 13

• Manufacturer Part Number: MC33260PG
• Description: IC PFC COMPACT PRECONVERT 8DIP
• Manufacturer: ON Semiconductor
• Series: GreenLine™r

Specifications of MC33260PG

• Mode: Discontinuous Conduction (DCM)
• Current - Startup: 100µA
• Voltage - Supply: 11 V ~ 16 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Maximum Operating Temperature: + 105 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MC33260PGOS

between the terminal and ground on the following pins:
SYNCHRONIZATION BLOCK
power switch off time.
that the current cycle (on- -time + inductor demagnetization)
is shorter than the synchronization period. Practically, the
inductor must be chosen accordingly. Otherwise, the system
will keep working in free running discontinuous mode.
Figure 36 illustrates this behavior.
minimum off- -time is forced. This delay limits the switching
frequency in light load conditions.
- - Still, the zero current must have been detected.
- - The precedent turn on must have been followed by (at
In particular, a 11 V Zener diode is internally connected
The MC33260 features two modes of operation:
In other words, the synchronization acts to prolong the
Consequently, a proper synchronized operation requires
It must be noticed that whatever the mode is, a 2.0 ms
least) one synchronization raising edge crossing the
1.0 V threshold.
 Free Running Discontinuous Mode: The power switch
 Synchronization Mode: This mode is set as soon as a
1 V
is turned on as soon as there is no current left in the
inductor (Zero Current Detection). This mode is
simply obtained by grounding the synchronization
terminal (Pin 5).
signal crossing the 1.0 V threshold, is applied to the
Pin 5. In this case, operation in free running can only
be recovered after a new circuit startup. In this mode,
the power switch cannot turn on before the two
following conditions are fulfilled.
R
sync
5
Sync
Pin Numbers are Relevant to the PDIP- -8 Version
1 V
Figure 31. Synchronization Arrangement
2 ms
+
--
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13
UVLO
Feedback, V
Synchronization.
OUTPUT SECTION
minimize the cross conduction current during high speed
operation. The gate drive is kept in a sinking mode whenever
the Undervoltage Lockout is active. The rise and fall times
have been controlled to typically equal 50 ns while loaded
by 1.0 nF.
REFERENCE SECTION
4% accurate over the temperature range (the typical value
is 200 mA). I
(I
UNDERVOLTAGE LOCKOUT SECTION
implemented to guarantee that the integrated circuit is
operating only if its supply voltage (V
enable a proper working. The UVLO comparator monitors
the Pin 8 voltage and when it exceeds 11 V, the device gets
active. To prevent erratic operation as the threshold is
crossed, 2.5 V of hysteresis is provided.
of 100 mA @ V
V
THERMAL SHUTDOWN
circuit gate drive and then to prevent it from oscillating, if
the junction temperature exceeds 150C typically.
drops below 120C typically (30C hysteresis).
regH
CC
The output stage contains a totem pole optimized to
An internal reference current source (I
An Undervoltage Lockout comparator has been
The circuit off state consumption is very low: in the range
An internal thermal circuitry is provided to disable the
The output stage is again enabled when the temperature
as the circuit presents a resistive load in this mode.
= I
S1
R2
S2
R2
ref
Q1
Q2
).
ref
control
CC
is the reference used for the regulation
= 5.0 V. This consumption varies versus
, Oscillator, Current Sense, and
Synchronization Mode
Q1 High <=>
&
Output_Ctrl
CC
ref
) is high enough to
) is trimmed to be
PWM
Latch
Set