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参数资料
| 型号： | L5994 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封装： | TQFP-32 |
| 文件页数： | 5/26页 |
| 文件大小： | 322K |
| 代理商： | L5994 |
Obsolete
Product(s)
- Obsolete
Product(s)
13/26
L5994 - L5994A
The 5V regulator is always active, even if both PWM regulators are disabled, as long as power is applied to the
chip.
The 2.5V reference voltage generator, provides comparison levels for threshold detection and device operation.
It is allowed to source up to 5mA to an external load from its buffered output, externally available through pin
VREF.
The reference voltage generator is active if at least one of the two RUNx signal is asserted.
If either PREG5 or VREF does not deliver the correct voltage, the device is shut down.
Figure 6. Controlled timing sequencies
t
RUN2
VOUT2
RUN1
t
VOUT1
t
CRST
PWROK1
t
RUN2
VOUT2
H2GATE
t
R2GATE
t
CRST
t
PWROK2
t
RUN1
t
VOUT1
t
H1GATE
t
R1GATE
a) TURN-ON TIMING SEQUENCE
b) SHUTDOWN TIMING SEQUENCE (1)
t
RUN2
VOUT2
H2GATE
t
R2GATE
t
CRST
t
PWROK2
t
RUN1
t
VOUT1
t
H1GATE
t
R1GATE
c) SHUTDOWN TIMING SEQUENCE (2)
t
H2GATE
t
R2GATE
t
VOUT2
t
PWROK
t
VOUT1
CRST
t
H1GATE
t
R1GATE
d) OVP TIMING SEQUENCE
PWROK2
t
PWROK1
t
PWROK1
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