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| 型號(hào)： | UA1538L-QM1-T |
| 廠商： | UNISONIC TECHNOLOGIES CO LTD |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 4-CH MOTOR DRIVER FOR PORTABLE CD PLAYERS |
| 中文描述： | DISK DRIVE MOTOR CONTROLLER, 0.5 A, PQFP44 |
| 封裝： | 0.80 MM PITCH, LEAD FREE, QFP-44 |
| 文件頁(yè)數(shù)： | 16/18頁(yè) |
| 文件大小： | 370K |
| 代理商： | UA1538L-QM1-T |
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UA1538
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
16
www.unisonic.com.tw
QW-R109-023,B
R3
R4
1.2V
-
+
7
12
VSYS1
R1
R2
R1=external resistor
R2=external resistor
R3=35k
R4=21k
EI
(2) Short protect function
·
When the error amplifier output(6PIN)has switched to the high-level state, SPRT (8PIN)is charged, and when
the voltage reaches 1.2V typ. , the SW(5PIN)switching stops. The time until switching stops is set by the
capacitor connected to SPRT(8PIN)according to the following formula.
TH
IV
TH
=1.2V,ISPRT=10
(3) Soft start function
·
The soft start function operates when a capacitor is connected between DEAD(4PIN)and GND.
Also, the maximum duty can be varied by connecting a resistor to 4PIN.
t=CDEAD
R(sec) ( R=65k
)
(4) Power off function
·
When low-level is applied to OFF(40PIN), SPRT(8PIN)is charged, and when the voltage reaches 1.2V typ. ,
the SW(5PIN)switching stops. The time until switching stops is set by the capacitor connected to
SPRT (8PIN)according to the following formula.
V
TH
I
OFF
(sec)(V
TH
=1.2V,I
OFF
=20
(5) Over voltage protection circuit
·
When the voltage applied to BSEN(1PIN)reaches 8.4V typ. , SPRT (8PIN) is charged, and when the voltage
reaches 1.2V typ. , theSW (5PIN)switching stops. The time until switching stops is set by the capacitor
connected to SPRT(8PIN)according to the following formula.
TH
V
TH
=1.2V,I
HV
=20
4 Empty detector block
(1) Output voltage
·
When the voltage applied to the BSEN(1PIN)falls below the detector voltage, EMP(35PIN)goes from high
level to low level(open-collector output). The detector voltage has 50mV typ. of hysteresis to prevent
output chattering. Use SEL (42PIN) to switch the detection voltage as shown below.
SEL
Detect Voltage
Return Voltage
L
2.20V typ.
2.25V typ.
High-Z
1.80V typ.
1.85V typ.
5 Reset circuit block
·
At about 90% typ. of the DC-DC converter output voltage, RESET(3PIN)goes from low level to high level,
and AMUTE(34PIN)goes from high level to low level. The reset voltage has 50mV typ. of hysteresis to
prevent output chattering.
6 Charging circuit block
·
The power supply for the charging circuit block is CHGVCC(41PIN), and is independent from the other
circuits. The resistance between RCHG (33PIN) and GND sets the charging current. This current is drawn
from SEL (42PIN).
·
A thermal shutdown circuit is provided, and when the chip temperature reaches 150
current is cut. The chip starts operating again at about 120
t=CSPRT
A)
t=CSPRT
A)
t=CSPRT
A)
typ. the charging
typ. .
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