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UC3578DPG4 датащи(PDF) 3 Page - Texas Instruments

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номер детали UC3578DPG4
подробное описание детали  Buck Pulse Width Modulator Stepdown Voltage Regulator
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UC3578DPG4 датащи(HTML) 3 Page - Texas Instruments

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UC2578
UC3578
ELECTRICAL CHARACTERISTICS: Unless otherwise specified VCC = 14V, VGG = 14V, TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
VGG Regulator Section
VGG – SRC
VCC = 72V, SRC = 0V, IVGG = –7mA
14.5
15.25
17
V
VCC = 50V, SRC = 0V, IVGG = –7mA
14
14.75
16
V
VCC = 15V, SRC = 0V, IVGG = –7mA
13
13.75
14.5
V
VCC = 11V, SRC = 0V, IVGG = –7mA
9.5
10
10.5
V
Soft Start Ramp Section
Soft Start Ramp Current
–30
–45
µA
Supply Current Section
IVCC
EAINV
≥ 2.1V, SRC = 0V
10
14
mA
IVGG
EAINV
≥ 2.1V, SRC = 0V
7
10.5
mA
CS: Peak current limit sense pin. Senses the current
across a current sense resistor placed between VCC and
the drain of the NMOS buck switch. OUT will be held low
(NMOS buck switch off) if VCC – CS exceeds 0.5V.
DIODE: An external small signal diode (1N4148 typical)
is connected here, anode to VCC and cathode to
DIODE, to implement the VGG regulator function.
EAINV: Inverting input to error amplifier. VOUT sense
feedback is connected to this pin. The non-inverting input
of the error amplifier is internally connected to 2V.
EAOUT: Output of the error amplifier. Use EAOUT and
EAINV for loop compensation components.
GND: Circuit Ground. The four ground pins are internally
connected together by the fused leadframe of the
package. They provide the primary thermal conduction
path for dissipating junction heat.
OUT:
Gate
drive
for
the
external
NMOS
switch
connected between VCC and the buck inductor.
SRC: This pin is connected to the junction of the external
NMOS switch source, the floating voltage source
capacitor, the free-wheeling diode cathode, and buck
inductor.
SS: The external soft start capacitor is connected to this
pin.
VGG: An external capacitor connected from VGG to
SRC completes the floating voltage source for the
floating gate driver. A 1
µF capacitor is recommended.
VCC: Input supply voltage. This pin supplies an internal
ground referenced voltage regulator that supplies the IC
and an on-chip regulated floating voltage source (VGG –
SRC) used by the floating driver to drive the external
NMOS buck switch. This pin should be bypassed with a
high quality ceramic capacitor.
PIN DESCRIPTIONS
The UC3578 Floating Buck Controller is a high frequency
switching regulator with a floating driver which provides
PWM control for non-isolated buck converters. The con-
troller operates at a fixed 100 kHz switching frequency,
and in voltage mode control. The duty cycle range of the
PWM output is 0% to 90% allowing for a wide range of
input voltages (14V minimum with transients to 72V).
The regulator features an undervoltage lockout threshold
of 11V with approximately 2V hysterisis as well as soft
start capability. The typical application circuit shown is for
a 15V to 40V input and a 12V at 3A output.
To ensure proper operation of the floating driver, an ex-
ternal capacitor (1
µF ceramic) must be connected from
VGG to SRC, and to the source of the external MOSFET
through a small resistor, as shown in the typical applica-
tion diagram and in Fig 2. This capacitor provides the en-
ergy for the high side driver. The gate drive voltage to
the MOSFET is internally regulated to 14V. A diode
(1N4148) is required from the input voltage to DIODE.
This allows the floating drive capacitor to charge during
conduction of the output rectifier but prevents its dis-
charge back into the supply rail. A 1
µF ceramic capacitor
is recommended from VCC to ground to provide high fre-
quency decoupling. Additional decoupling of this pin
could be accomplished by a low value resistor between
VCC and VIN anda1µF capacitor from VCC to GND as
shown in the schematic.
APPLICATION INFORMATION
Not Recommended for New Designs


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