參數(shù)資料
型號(hào)： L6710TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, PQFP44
封裝： 10 X 10 MM, 1 MM HEIGHT, TQFP-44
文件頁(yè)數(shù)： 34/34頁(yè)
文件大?。?/td> 1610K
代理商： L6710TR
9/34
L6710
OSCILLATOR
The switching frequency is internally fixed at 150kHz. Each phase works at the frequency fixed by the os-
cillator so that the resulting switching frequency at the load side results in being doubled.
The internal oscillator generates the triangular waveform for the PWM charging and discharging with a
constant current an internal capacitor. The current delivered to the oscillator is typically 25
A
(Fsw=150kHz) and may be varied using an external resistor (ROSC) connected between OSC pin and
GND or Vcc. Since the OSC pin is maintained at fixed voltage (Typ. 1.237V), the frequency is varied pro-
portionally to the current sunk (forced) from (into) the pin considering the internal gain of 6KHz/
A.
In particular connecting it to GND the frequency is increased (current is sunk from the pin), while connect-
ing ROSC to Vcc=12V the frequency is reduced (current is forced into the pin), according to the following
relationships:
ROSC vs. GND:
ROSC vs. 12V:
Note that forcing 25
A into this pin, the device stops switching because no current is delivered to the os-
cillator.
Figure 1. ROSC vs. Switching Frequency
DIGITAL TO ANALOG CONVERTER AND REFERENCE
The built-in digital to analog converter allows the adjustment of the output voltage from 0.8375V to
1.6000V with 12.5mV as shown in the previous table 1 automatically regulating VID* = VID - 25mV in order
to avoid any external component or circuitry to lower the regulated voltage meeting VRD10 specs. The
internal reference is trimmed to ensure the output voltage precision of ±0.5% and a zero temperature co-
efficient around 70°C. The internal reference voltage for the regulation is programmed by the voltage iden-
tification (VID) pins. These are inputs of an internal DAC that is realized by means of a series of resistors
providing a partition of the internal voltage reference. The VID code drives a multiplexer that selects a volt-
age on a precise point of the divider. The DAC output is delivered to an amplifier obtaining the VPROG volt-
age reference (i.e. the set-point of the error amplifier). Internal pull-ups are provided (realized with a 5
A
current generator up to 3V Typ); in this way, to program a logic "1" it is enough to leave the pin floating,
while to program a logic "0" it is enough to short the pin to GND. Programming the "11111x" code (VID5
doesn't matter), the device enters the NOCPU mode: all mosfets are turned OFF.
f
S
150 KHz
1.237
R
OSC
--------------- 6
kHz
A
-----------
150kHz
7.422 10
6
R
OSC K
()
-----------------------------
+
=
+
=
f
S
150 KHz
12 1.237
–
R
OS C
------------------------- 6
kHz
A
-----------
150 kHz
6.457 10
7
R
OSC K
()
-----------------------------
+
=
+
=
0
2000
4000
6000
8000
10000
12000
14000
25
50
75
100
125
150
Frequency (KHz)
Ro
s
c(
K
)v
s.
12V
0
100
200
300
400
500
600
700
800
150
250
350
450
550
650
Frequency (KHz)
Ro
sc(
K
)v
s
.G
N
D
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