PTD08A020W_10 Datasheet, PDF (4/15 Pages) Texas Instruments – 20-A, 4.75-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, DIGITAL POWERTRAIN™ MODULE

PTD08A020W
SLTS286F – MAY 2007 – REVISED FEBRUARY 2010
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ELECTRICAL CHARACTERISTICS
PTD08A020W
T_A= 25°C, F_SW= 350kHz, V_I= 12 V, V_O= 3.3 V, V_B= V_I, C_I1= 330 µF, C_I2= 22 µF ceramic, C_O1= 47 µF ceramic, C_O2= 330 µF,
and I_O= I_O(max) (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTD08A010W
UNIT
MIN
TYP
MAX
I_O
V_I
V_OADJ
Output current
Input voltage range
Output voltage adjust range
Over V_O range
Over I_O range
Over I_O range
25°C, natural convection
h
Efficiency
I_O = 20 A,
fs = 350 kHz
V_OPP
V_B
V_B
UVLO
V_O Ripple (peak-to-peak)
Bias voltage
Bias voltage under voltage
lockout
I_B
Bias current
20-MHz bandwidth
Inhibit (pin 8) to AGND
V_O = 3.3 V
V_O = 2.5 V
V_O = 1.8 V
V_O = 1.5 V
V_O = 1.2 V
V_O = 1.0 V
0
4.75
0.7 ⁽¹⁾
4.75
V_B increasing
4.25
V_B decreasing
4.0
Standby
Switching
91%
89%
86%
84%
83%
80%
20
4.5
4.25
5
42
20
A
14 ⁽¹⁾
V
3.6
V
14
4.75
4.5
mV_PP
V
V
mA
V_IH
High-level input voltage
V_IL
Low-level input voltage
PWM input
SRE, INH, & PWM input levels
Frequency range
Pulse width limits
2.0
5.5
V
0.8
300
500 kHz
130
ns
Range
-40
125 °C
TEMP output
Accuracy, -40°C ≤ T_A ≤ 85°C
Slope
-4.0
+6.0 °C
10
mV/°C
V_OH
V_OL
FAULT output
I_LIM
Offset, T_A = 0°C
High-level output voltage, I_FAULT = 4mA
Low-level output voltage, I_FAULT = 4mA
Overcurrent threshold; Reset, followed by auto-recovery
Range
500
2.7
3.3
0
35
0.15
mV
V
0.6
A
3.5
V
IOUT output
Gain
Offset
46
66
86 mV/A
0.44
0.6
0.76
V
Output Impedance
10
15
20 kΩ
C_I
External input capacitance
Capacitance Value
C_O
External output capacitance
Equivalent series resistance (non-ceramic)
Nonceramic
Ceramic
Nonceramic
Ceramic
330 ⁽²⁾
µF
22 ⁽²⁾
330 ⁽³⁾ 10,000⁽⁴⁾
47 ⁽³⁾
µF
(3)
1 ⁽⁵⁾
mΩ
(1) The maximum input voltage is duty cycle limited to (V_O/(130ns × F_SW)) or 14 V, whichever is less. The maximum allowable input voltage
is a function of switching frequency.
(2) A 22 µF ceramic input capacitor is recommended for operation. An additional 330 µF bulk capacitor rated for a minimum of 500mA rms
of ripple current is recommended. Refer to the UCD9240 controller datasheet and user interface for application specific capacitor
specifications.
(3) A 47 µF ceramic output capacitor is recommended for operation. An additional 330 µF bulk capacitor is recommended for improved
transient response. See the related Application Information section for further guidance. Refer to the UCD9240 controller datasheet and
user interface for application specific capacitor specifications.
(4) 10,000 µF is the calculated maximum output capacitance given a 1V/msec output voltage rise time. Additional capacitance or increasing
the output voltage rise rate may trigger the overcurrent threshold at start-up.
(5) This is the minimum ESR for all non-ceramic output capacitance. Refer to the UCD9240 controller datasheet and user interface for
application specific capacitor specifications.
4
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