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參數(shù)資料
| 型號(hào)： | UCC2945 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1V Synchronous Boost Converter |
| 中文描述： | 1V的同步升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 3/11頁(yè) |
| 文件大?。?/td> | 190K |
| 代理商： | UCC2945 |
3
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, for UCC3941, T
A
= 0°C to 70°C; for UCC2941, T
A
= –40°C
to 85°C; VIN = 1.25V, T
A
= T
J
.
PARAMETER
TEST CONDITIONS
Inductor Charging Section
Charge Switch R
DS(on)
N and D Package, I = 200mA
Current Limit Delay
(Note 1)
Synchronous Rectifier Section
Rectifier R
DS(on)
N and D Package, I = 200mA, UCC3941-ADJ V
OUT
= 3.3V
and UCC3941–3
N and D Package, I = 200mA, UCC3941-5
Shutdown Section
Shutdown Bias Current
Note 1:
Performance from application circuit shown in Figures 3 - 5 guaranteed by design and alternate testing methods, but not
100% tested as shown in production.
Note 2:
For the UCC3941-3, VOUT = 3.47V and VGD = 9.3V For the UCC3941-5, VOUT = 5.25V VGD = 9.3V For the UCC3941-
ADJ, FB = 1.315V VGD = 9.3V
MIN
TYP
MAX
UNITS
0.25
50
0.4
ns
0.35
0.6
0.5
0.8
–10
–7
μ
A
PIN DESCRIPTIONS
FB:
Feedback control pin used in the UCC3941-ADJ
version only. The internal reference for this comparator is
1.25V and external resistors provide the gain to the
output voltage.
PGND:
Power ground of the IC. The inductor charging
current flows through this pin. For the UCC3941-ADJ
signal ground and power ground lines are tied to a
common pin.
PLIM:
This pin is programmed to set the maximum input
power for the converter. For example a 1A current limit at
1V would have a 333mA limit at 3V input keeping the
input power constant at 1W. The peak current at VIN =
1V is programmed to 1.5A (1.5W) when this pin is
grounded. The power limit is given by:
n
R
PL
.
+
6 7
PL
V
W
(
IN
)
.
0 26
)
=
+
11 8
where R
PL
is equal to the external resistor from the PLIM
pin to ground and n is the expected efficiency of the
converter. The peak current limit is given by:
n
PK( )
IN
PL
.
+
6 7
(
)
I
V
R
.
.
=
+
11 8
0 26
Constant power gives several advantages over constant
current such as lower output ripple.
SD:
When this pin is open, the built in 7
μ
A current source
pulls up on the pin and programs the IC to go into
shutdown mode. This pin requires an open circuit for
shutdown and will not operate correctly when driven to a
logic level high with TTL or CMOS logic. When this pin is
connected to ground, (either directly or with a transistor)
the IC is enabled and both output voltages will regulate.
SGND:
Signal ground of the IC. For the UCC3941-ADJ
signal ground and power ground lines are tied to a
common pin.
SW:
An inductor is connected between this node and
VIN. The VGD (Gate Drive Supply) flyback diode is also
connected to this pin. When servicing the 3.3V supply,
this pin will go low charging the inductor, then shut off,
dumping the energy through the synchronous rectifier to
the output. When servicing the VGD supply, the internal
synchronous rectifier stays off, and the energy is diverted
to VGD through the flyback diode. During discontinuous
portions of the inductor current a MOSFET resistively
connects VIN to SW damping excess circulating energy
to eliminate undesired high frequency ringing.
VGD:
The VGD pin which is coarsely regulated around
9V and is primarily used for the gate drive supply for the
power switches in the IC. This pin can be loaded with up
to 10mA as long as it does not present a load at voltages
below 2V. This ensures proper startup of the IC. The
VGD supply can go as low as 7.5V without interfering
with the servicing of the 3.3V output. Below 7.5V, VGD
will have the highest priority, although practically the
voltage should not decay to that level if the output
capacitor is sized properly.
VIN:
Input voltage to supply the IC during startup. After
the output is running the IC draws power from VOUT or
VGD.
VOUT:
Main output voltage (3.3V, 5V or adjustable)
which has highest priority in the multiplexing scheme, as
long as VGD is above the critical level of 7.5V. Loads
over 150mA are achievable at 1V input voltage. This
output will startup with 1V input at full load.
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