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UC3573 датащи(PDF) 3 Page - Texas Instruments

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номер детали UC3573
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3573 датащи(HTML) 3 Page - Texas Instruments

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3
UC1573
UC2573
UC3573
3VREF: Precision 3V reference. Bypass with 100nF ca-
pacitor.
CS: Peak current limit sense pin. Senses the current
across a current sense resistor placed between VCC and
source of the PMOS Buck switch. OUT will be held high
(PMOS buck switch off) if VCC – CS exceeds 0.4V.
EAINV: Inverting input to error amplifier. VOUT sense
feedback connected to this pin. The non-inverting input of
the error amplifier is internally connected to:
3
2
VREF
Volts.
Connecting the EAINV pin to an external voltage greater
than 2.6V commands the chip to go into a low current
sleep mode.
EAOUT: Output of error amplifier. Use EAOUT and
EAINV for loop compensation components.
GND: Circuit Ground.
OUT: Gate drive for external PMOS switch connected be-
tween 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 4.75V to 30V.
Bypass with a 1
µF capacitor.
PIN DESCRIPTIONS
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, these parameters apply for TA = –55°C to +125°C for
the UC1573, –40°C to +85°C for the UC2573, and 0°C to +70°C for the UC3573, VCC = 5V, CT = 680pF, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Sleep Mode Section
Threshold
1.8
2.2
2.6
V
Supply Current Section
IVCC
VCC = 30V
9
12
mA
IVCC
VCC = 30V, EAINV = 3V
50
150
A
Typical Waveforms.
UDG-94107


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