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UC2910 датащи(PDF) 3 Page - Texas Instruments

номер детали UC2910
подробное описание детали  4-Bit DAC and Voltage Monitor
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC2910 датащи(HTML) 3 Page - Texas Instruments

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UC1910
UC2910
UC3910
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Monitor Circuitry (Note 2) (cont.)
VSENSE OVP Threshold Voltage
Code 0, Ratio = 0.45
3.937
4.025
4.113
V
Code 0, Ratio = 0.9
4.41
4.55
4.69
V
Code 15, Ratio = 0.45
2.235
2.3
2.365
V
Code 15, Ratio = 0.9
2.505
2.6
2.695
V
OV, UV Comparator Hysteresis
Code 0, Ratio = 0.9
70
88
120
mV
Code 15, Ratio = 0.45
15
25
40
mV
OVP Comparator Hysteresis
Code 0, Ratio = 0.9
160
218
300
mV
Code 15, Ratio = 0.45
40
62
85
mV
Input Common Mode Range
OV, UV, OVP Comparators
0
5
V
Propagation Delay
OV, UV Comparators
5
µs
OVP Comparator
5
µs
PWRGOOD, OVP, OVPB Outputs
PWRGOOD Voltage Low
IPWRGOOD = 10mA
0.4
V
OVP Sourcing Current
VOVP = 1.4V
65
mA
OVPB Voltage Low
IOVPB = 1mA
0.4
V
ELECTRICAL CHARACTERISTICS (cont.) Unless otherwise specified, VCC = 12V, VSENSE = 3.5V, VOVTH/UVTH =
1.26V, VD0 = VD1 = VD2 = VD3 = 0V, 0°C < TA < 70°C for the UC3910, –25°C < TA < 80°C for the UC2910, –55°C < TA < 125°C for
the UC1910 TA = TJ.
D0-D3 (DAC Digital Input Control Codes): These are
the DAC digital input control codes, with D0 repre-
senting the least significant bit (LSB) and D3, the most
significant bit (MSB) (See Table 1). A bit is set low by
being connected to GND; a bit is set high by floating it,
or connecting it to a 3V to 5V voltage source. Each con-
trol pin is pulled up to approximately 4.8V by an internal
40
µA current source.
DACBUF (Buffered DACOUT Voltage): This pin pro-
vides a buffered version of the DACOUT voltage to al-
low external programming of the OV/UV thresholds (see
OVTH/UVTH below).
DACOUT (Digital-to-Analog Converter Output Volt-
age): This pin is the output of the 4-bit digital to analog
(DAC) converter. Setting all input control codes low pro-
duces 3.5V at DACOUT; setting all codes high pro-
duces 2.0V at DACOUT. The LSB step size (i.e.
resolution) is 100mV (See Table 1). The DACOUT
source impedance is typically 3k
Ω and must therefore
drive a high impedance input. Bypass DACOUT at the
driven input with a 0.01
µF, low ESR, low ESL capacitor
for best circuit noise immunity.
GND (Signal Ground): All voltages are measured with
respect to GND. The two GND pins are connected to-
gether internally but should also be connected exter-
nally using a short PC board trace. Bypass capacitors
on the VCC and VREF pins should be connected di-
rectly to the ground plane near one of the signal ground
PIN DESCRIPTIONS
Note 1: "Line, Load" implies that the parameter is tested at all combinations of the conditions:
10.8V < VCC < 13.2V, –2mA < IVREF < 0mA.
Note 2: These are the actual voltages on VSENSE which will cause the OVPB and PWRGOOD outputs to switch, assuming the
DACOUT voltage is perfect. These limits apply for 0°C < TA < 70°C.
Note 3: "Code 0" means pins D0 - D4 are all low; "Code 15" means they are all floating or high (See Table 1). "Ratio" is the divider
ratio of the resistor string between DACBUF and OVTH/UVTH (See Figure 1).
Decimal
Code
D3
D2
D1
D0
DACOUT
Voltage
15
1111
2.0
14
1110
2.1
13
1101
2.2
12
1100
2.3
11
1011
2.4
10
1010
2.5
91001
2.6
81000
2.7
70111
2.8
60110
2.9
50101
3.0
40100
3.1
30011
3.2
20010
3.3
10001
3.4
00000
3.5
Table 1. Programming the DACOUT Voltage
3


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