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UC2577T-ADJG3 Datasheet(PDF) 3 Page - Texas Instruments

Part # UC2577T-ADJG3
Description  Simple Step-Up Voltage Regulator
Download  14 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UC2577T-ADJG3 Datasheet(HTML) 3 Page - Texas Instruments

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UC2577-ADJ
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Device Parameters (cont.)
Switch Transconductance
12.5
A/V
Switch Leakage Current
VSWITCH = 65V, VFB = 1.5V (Switch Off)
10
600
µA
TJ = 25
°C300
µA
Switch Saturation Voltage
ISWITCH = 2.0A, VCOMP = 2.0V (Max Duty Cycle)
0.5
0.9
V
T
J = 25
°C0.7
V
NPN Switch Current Limit
VCOMP = 2.0V
3.0
4.3
6.0
A
Thermal Resistance
Junction to Ambient
65
°C/W
Junction to Case
2
°C/W
COMP Pin Current
VCOMP = 0
25
50
µA
TJ = 25
°C40
µA
Unless otherwise stated, these specifications apply for TA =
−40°C to +125°C, VIN =
5V, VFB = VREF, ISWITCH = 0, and TA =TJ.
ELECTRICAL CHARACTERISTICS
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating ratings
indicate conditions during which the device is intended to be functional, but device parameter specifications may not be
guaranteed under these conditions. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: Output current cannot be internally limited when the UC2577 is used as a step-up regulator. To prevent damage to
the switch, its current must be externally limited to 6.0A. However, output current is internally limited when the UC2577 is
used as a flyback or forward converter regulator.
Note 3. External components such as the diode, inductor, input and output capacitors can affect switching regulator
performance. When the UC2577 is used as shown in the Test Circuit, system performance will be as specified by the
system parameters.
Note 4: A 1.0M
Ω resistor is connected to the compensation pin (which is the error amplifier’s output) to ensure accuracy in
measuring AVOL. In actual applications, this pin’s load resistance should be
≥ 10MΩ, resulting in AVOL that is typically twice
the guaranteed minimum limit.
Figure 1. Circuit Used to Specify System Parameters
UDG-94035
L = 415-0930 (AIE)
D = any manufacturer
COUT = Sprague Type 673D
Electrolytic 680
µF, 20V
R1 = 48.7k in series with 511
Ω (1%)
R2 = 5.62k (1%)
3


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