Datasheet

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ELECTRICAL CHARACTERISTICS
PTN78060A
SLTS245B – APRIL 2005 – REVISED AUGUST 2006
operating at 25°C free-air temperature, V
I
= 20 V, V
O
= –5 V, I
O
= I
O
(max), C
1
= 100 µF, C
2
= 3 × 4.7 µF, C
3
= 100 µF, and
C
4
= 4.7 µF (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
O
= –15 V 0.1 1
(1)
V
O
= –12 V 0.1 1.25
(1)
I
O
Output current T
A
= 85°C, natural convection airflow A
V
O
= –5 V 0.1 3
(1)
V
O
= –3.3 V 0.1 3
(1)
V
O
= –15 V 9 17
(2)
V
O
= –12 V 9 20
(2)
V
I
Input voltage range Over I
O
range V
V
O
= –5 V 9 27
(2)
V
O
= –3.3 V 9 28.7
(2)
Set-point voltage T
A
= 25 ° C ±2%
(3)
tolerance
Temperature variation –40°C to +85°C ±0.5%
V
O
Line regulation Over V
I
range ±10 mV
Load regulation Over I
O
range ±10 mV
Total output voltage Includes set point, line, load
±3%
(3)
variation –40 < T
A
< 85°C
Output voltage adjust 9 V ≤ V
I
≤ (32 - |V
O
|) V –15 –3
V
O
V
range
R
SET
= 100 Ω, I
O
= 1 A, V
O
= –15 V 88%
R
SET
= 2 k Ω, I
O
= 1.25 A, V
O
= –12 V 87%
η Efficiency
R
SET
= 28.7 k Ω, I
O
= 3 A, V
O
= –5 V 82%
R
SET
= 221 k Ω, I
O
= 3 A, V
O
= –3.3 V 77%
Output voltage ripple 20-MHz bandwidth 2% V
O
V
(PP)
I
O (LIM)
Current limit threshold ∆ V
O
= –50 mV 5.5 A
Recovery time 200 µs
1-A/µs load step from 50% to 100%
Transient response
I
O
max
V
O
over/undershoot 2 %V
O
F
S
Switching frequency Over V
I
and I
O
ranges 440 550 660 kHz
UVLO Undervoltage lockout V
I
increasing 5.5 V
Ceramic 14.1
(4)
External input
C
I
µF
capacitance
Nonceramic 100
(4)
Ceramic 200
µF
External output
C
O
Nonceramic 100
(5)
1000
capacitance
Equivalent series resistance (nonceramic) 14
(6)
m Ω
Per Telcordia SR-332, 50% stress,
MTBF Calculated reliability 8.9
10
6
Hr
T
A
= 40°C, ground benign
(1) The maximum output current is 3 A or a maximum output power of 15 W, whichever is less.
(2) The maximum input voltage is limited and defined to be (32 - |V
O
|).
(3) The set-point voltage tolerance is affected by the tolerance and stability of R
SET
. The stated limit is unconditionally met if R
SET
has a
tolerance of 1% with 100 ppm/°C or better temperature stability.
(4) A 100-µF electrolytic capacitor and three 4.7-µF ceramic capacitors are required across the input (V
I
and GND) for proper operation.
Locate the ceramic capacitors close to the module.
(5) 100 µF of output capacitance is required for proper operation. See the application information for further guidance.
(6) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m Ω as the minimum when using max-ESR values to
calculate.
3
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