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参数资料
| 型号： | SS6578 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH EFFICIENCY STEP DOWN DC/DC CONTROLLER |
| 中文描述： | 高效率降压DC / DC控制器 |
| 文件页数： | 5/11页 |
| 文件大小： | 221K |
| 代理商： | SS6578 |
www.SiliconStandard.com 5 of 11
SS6578
BLOCK DIAGRAM
70mV
8
7
6
5
4
3
2
1
Current Limit Comparator
Output
Driver
GND
DRI
CS+
CS-
VIN
PFM
OSC
1.22V
Reference
Voltage
Error
Comparator
DUTY
FB
SHDN
VIN
+
-
LATCH
-
+
PIN DESCRIPTIONS
PIN 1: VIN
- Input supply voltage - a range of
4V to 18V is recommended.
PIN 2: DUTY - Duty cycle adjustment pin. To be
tied to the VIN pin directly or
through a resistor R
DUTY
to adjust
oscillator duty cycle. R
DUTY
must
be over 1M
if V
IN
=20V.
See TYPICAL PERFORMANCE
CHARACTERISTICS.
PIN 3:
SHDN
- Logical input to shutdown the
chip:
V
SHDN
=
operation.
V
SHDN
= Low for shutdown.
This pin should not be floating or
be forced to over 15V. In
shutdown mode DRI pin is held
high.
High
for
normal
PIN 4: FB
- Feedback comparator input, to
compare the feedback voltage
with the internal reference voltage.
Connecting a resistor R1 to
converter output node and a
resistor R2 to ground yields the
output voltage:
V
OUT
=1.22 x (R1+R2)/ R2
PIN 5: GND - Power ground.
PIN 6: DRI - Push-pull driver output to drive an
external P-channel MOSFET or
PNP transistor. When driving a
PNP bipolar transistor, a base
resistor and a capacitor to the
base of PNP are recommended.
PIN 7: CS- - Current-sense
comparator
inverting input. This pin voltage
should go over 2V but should
not exceed VIN voltage.
PIN 8: CS+ - Current
sense
comparator
non-inverting input. This pin
voltage should go over 2V but
should not exceed V
IN
voltage.
Rev.2.0
2
4
/06/200
4
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