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SS6652CSTR датащи(PDF) 4 Page - Silicon Standard Corp.

номер детали SS6652CSTR
подробное описание детали  Micro-Power Inverting DC/DC Controller
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производитель  SSC [Silicon Standard Corp.]
домашняя страница  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6652CSTR датащи(HTML) 4 Page - Silicon Standard Corp.

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SS6652
n PIN DESCRIPTIONS
PIN 1: VIN
- Input supply voltage (2.4V~7V)
PIN 2: VREF - Reference output (1.22V). Bypass
with a 0.047
µF capacitor to GND.
Sourcing capability is guaranteed
to be greater than 250
µA.
PIN 3: SHDN- Logic input to shutdown the chip.
>1.5V = normal operation,
GND = shutdown
In shutdown mode DLOW and
DHI pins are at high level.
PIN 4: FB
- Feedback signal input to sense
ground. Connecting a resistor R1
to VOUT and a resistor R2 to VREF
pin yields the output voltage:
VOUT = - (R1/R2 ) x VREF
PIN 5: GND - Power ground.
PIN 6: DLOW - Driver sinking output. Connected
to DHI when using an external P-
channel MOSFET. When using an
external PNP bipolar transistor,
connect a resistor RB from this
pin to DHI. RB value depends on
VIN, inductor and PNP bipolar
transistor. By adjusting the RB
value, efficiency can be optimized.
PIN 7: DHI
- Driver sourcing output. Connect to
gate of the external P-channel
MOSFET or base of the PNP bi-
polar transistor.
PIN 8: CL
- Current-limit
input.
This
pin
clamps the switch peak current to
prevent over-current damage to
the external switch.
n APPLICATION INFORMATION
2
4
6
8
0
0.2
0.4
0.6
0.8
100
µH
120
µH
150
µH
180
µH
220
µH
VIN (V)
Max. Output Power vs VIN
Inductor Value
Typical Application Circuit
The typical application circuit generates an adjustable
negative voltage for contrast bias of LCD displays. Ef-
ficiency and output power can be optimized by using
appropriate inductor and switch. The following formu-
lae provide a guideline for determining the optimal
component values:
L
= (11.1 0.15
V )
V
I
V
IN
IN
OUT
OUT
×
×
×
PNP :
V
V
V
CEO
IN
OUT
>
+
I
200
I
V
C, MAX
OUT
IN
×
V
0. 4 V at I
= 200
I
V
CE
C
OUT
IN
<
×
and
10
β =
RB
≅ 3 x L x (V
IN - 0.8)
where, VIN(V), VOUT(V), IOUT(A), L(µH), RB(Ω)
Rev.2.01 6/26/2003


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