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UC1572 Datasheet(Fiches technique) 4 Page - Texas Instruments

Numéro de pièce UC1572
Description  Negative Output Flyback Pulse Width Modulator
Télécharger  5 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC1572 Datasheet(HTML) 4 Page - Texas Instruments

  UC1572 Datenblatt HTML 1Page - Texas Instruments UC1572 Datenblatt HTML 2Page - Texas Instruments UC1572 Datenblatt HTML 3Page - Texas Instruments UC1572 Datasheet HTML 4Page - Texas Instruments UC1572 Datenblatt HTML 5Page - Texas Instruments  
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4
UC1572
UC2572
UC3572
4
8
7
1
2
6
5
3
R
SLEEP1
56k
R
SLEEP2
33k
R
COMP
R
REF
RV
SENSE
40k
RSLEEP3
1MEG
R
CS
C
IN
10
µF
COUT
100
µF
VOUT
GND
–12V OUT
D
FLYBACK
L
FLYBACK
M
SWITCH
C
RAMP
680pF
CV
CC
10
µF
M
SLEEP
GND
SLEEP
VIN
VCC
3VREF
RAMP
EAINV
EAOUT
GND
CS
OUT
UC1572
C3V
REF
100nF
C
COMP
Figure 2. Typical application: +5V to –12V flyback converter.
UDG-99057
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
PIN DESCRIPTIONS
3VREF: Precision 3V reference. Bypass with 100nF ca-
pacitor to GND.
CS: Current limit sense pin. Connect to a ground refer-
enced current sense resistor in series with the flyback in-
ductor. OUT will be held high (PMOS switch off) if CS
exceeds 0.2V.
EAINV: Inverting input to error amplifier. Summing junc-
tion for 3VREF and VOUT sense. The non-inverting input
of the error amplifier is internally connected to GND. This
pin will source a maximum of 1mA.
EAOUT: Output of error amplifier. Use EAOUT and
EAINV for loop compensation components.
GND: Circuit Ground.
OUT: Gate drive for external PMOS switch connected
between VCC and the flyback inductor. OUT drives the
gate of the PMOS switch between VCC and GND.
RAMP: Oscillator and ramp for pulse width modulator.
Frequency is set by a capacitor to GND by the equation
F
kCRAMP
=
1
15
Recommended operating frequency range is 10kHz to
200kHz.
VCC: Input voltage supply to chip. Range is 4.75 to 30V.
Bypass with a 1
µF capacitor.


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