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UC1874L-2 датащи(PDF) 4 Page - Texas Instruments

номер детали UC1874L-2
подробное описание детали  High Efficiency, Synchronous, Step-down Buck Controllers
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
Logo TI - Texas Instruments

UC1874L-2 датащи(HTML) 4 Page - Texas Instruments

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4
UC1874-1,-2
UC2874-1,-2
UC3874-1,-2
ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications apply for TA = –55°C to +125°C for
UC1874; TA = –25°C to +85°C for UC2874; 0°C to +70°C for UC3874; VCC = 12V, Ct = 680pF, CCAP = 1 F; CBOOT = 0.1 F;
TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Sleep/Soft start/Bootstrap Section (continued)
Bootstrap Regulation Voltage
UCX874-2, Low Driver ON
9.5
10.2
12.5
V
UCX874-1, Low Driver ON
6
7.5
9
V
Bootstrap Refresh Voltage
UCX874-2, VCAOUT >VCTPEAK
789
V
UCX874-1, VCAOUT >VCTPEAK
2.7
3.5
4
V
High Side Driver Output Section
Output High Voltage
IOUT = –50mA, Boot = 23V
21
22.2
V
Output Low Voltage
IOUT = 50mA
1
2.2
V
IOUT = 10mA
300
500
mV
Output Low (UVLO)
IOUT = 50mA, VCC = 0V
0.9
1.5
V
Output Rise Time
COUT = 1nF
40
160
ns
Output Fall Time
COUT = 1nF
30
100
ns
Low Side Driver Output Section
Output High Voltage
IOUT = –50mA, VCAP = 11V
8.8
9.5
V
Output Low Voltage
IOUT = 50mA
1
2.2
V
IOUT = 10mA
300
500
mV
Output Low (UVLO)
IOUT = 50mA, VCC = 0V
0.9
1.5
V
Output Rise/Fall Time
CLOAD = 1nF
40
160
ns
Output Fall Time
COUT = 1nF
30
100
ns
X10 Amplifier Section
Gain
VISNS
± VISNS = 20mV to 80mV
9.2
9.8
10.4
V/V
Slew Rate Rising
TA = 25°C
1
1.4
V/ s
Slew Rate Falling
TA = 25°C
2
3.5
V/ s
Input Resistance
TA = 25°C
60
100
165
k
PIN DESCRIPTIONS
BOOT: This pin provides the high side rail for the
HDRIVE output.
An external capacitor (CBST)is
connected between this pin and the drain of the external
low side MOSFET.
When the low side MOSFET is
conducting Cbst is charged to 11V via an external diode
tied to CAP. When the low side MOSFET turns off and
the high side MOSFET turns on, the Cbst bootstraps
itself up with the source of high side MOSFET, ultimately
providing a 10V Vgs for the upper MOSFET. Since this
10V is referenced to the source of the high side
N-channel MOSFET, the actual voltage on BOOT and
HDRIVE is approximately 10V above VCC while the high
side MOSFET is conducting. The voltage on BOOT is
continuously
monitored
during
low
input
voltage
conditions when the duty cycle equals approximately
100% to insure that a sufficient gate drive level is being
supplied by the UC3874. If the voltage on BOOT falls
below 8V (UC3874-2) or 3.5V (UC3874-1), the IC forces
the low side driver to cycle itself on for the few cycles
required to replenish CBST. In this way, virtual 100% duty
cycle operation is provided.
CA-: This is the inverting input to the current amplifier.
Connect a series resistor and capacitor between this pin
and CAOUT to set the current loop compensation. An in-
put resistor between this pin and ISOUT provides the in-
ductor current sense signal to the amplifier and also
sets the high frequency gain of the amplifier. The com-
mon mode operating range for this input is between GND
and 4V. The normal range during operation is between
2V and 3V.
CAOUT: This is the output of the wide bandwidth current
amplifier and one of the inputs to the PWM duty cycle
comparator. The output signal generated by this amplifier
commands the PWM to force the correct duty cycle to
maintain output voltage in regulation. The output can
swing from 0.1V to 4V.


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