TS19375 [TSC]
PWM Step-Up Controller Oscillation frequency: 500kHz; PWM升压控制器振荡频率: 500kHz的型号: | TS19375 |
厂家: | TAIWAN SEMICONDUCTOR COMPANY, LTD |
描述: | PWM Step-Up Controller Oscillation frequency: 500kHz |
文件: | 总8页 (文件大小:144K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
TS19375
PWM Step-Up Controller
SOP-8
Pin Definition:
1. EN
2. Vcc
3. FB
4. SS
8. NC
7. GND
6. Gate
5. Sense
General Description
The TS19375 is high efficient PWM step-up controller. Designed to drive an external N-channel MOSFET, Output
voltage is programmable with 1.0V of standard voltage supply internal, and using externally connected
components, output voltage (FB) can be set up at will.
The TS19375 can be operated at switching frequencies of 500kHz allowing for easy filtering and low noise, the
size of the external components can be reduced. An enable function and thermal shutdown functions are built
inside. The soft-start time can be programmed by outside capacitor; the function prevents overshoot at startup.
Features
Ordering Information
●
●
●
●
●
●
●
●
Input voltage range 3V ~ 24V
Part No.
Package
SOP-8
Packing
Output voltage: Define by N-CH MOSFET
Duty ratio: 0% ~ 85% PWM control
Oscillation frequency: 500kHz
TS19375CS RLG
2.5Kpcs / 13” Reel
Note: “G” denotes for Halogen Free
Soft-start time programmed by external capacitor Application
Thermal shutdown protection
●
●
●
LED Panel Display Backlighting
PDA and Portable Media Players
Local Boost Regulator
Internal current limit
External SW N-CH MOSFET
Typical Application Circuit
1/8
Version: B11
TS19375
PWM Step-Up Controller
Absolute Maximum Rating
Characteristics
VCC Pin Voltage
Symbol
VCC
Rating
VSS - 0.3 to VSS + 26
VSS - 0.3 to 12
VSS - 0.3 to VCC
VSS - 0.3 to VCC
VSS - 0.3 to VCC
VSS - 0.3 to VCC
Internally limited
-40 to +150
Unit
V
Feedback Pin Voltage
VFB
V
EN Voltage
VEN
V
SENSE Voltage
VSENSE
VSS
V
SS Pin Voltage
V
Gate Pin Voltage
VGATE
PD
V
Power Dissipation
mW
ºC
ºC
V
Storage Temperature Range
Operating Junction Temperature Range
Operating Supply Voltage
Thermal Resistance from Junction to case
Thermal Resistance from Junction to ambient
TSTG
TOPJ
VOP
-20 to +125
+3 to +24
θ
JC
40
ºC/W
ºC/W
θ
JA
120
Note: Stresses exceed those rating may damage the device
Electrical Specifications (TA=25oC, VIN=5V, VOUT=12V unless otherwise noted)
Characteristics
Feedback Voltage
Quiescent Current
Feedback Bias Current
Shutdown Supply Current
Oscillation Frequency
Sense Voltage
Symbol
VFB
Conditions
Min Typ Max Units
IOUT=0.1A
0.975 1.000 1.025
V
mA
uA
uA
KHz
V
ICCQ
IFB
VFB=1.5V force driver off
IOUT=0.1A
-
4
0.1
1
6
-
0.5
ISD
VEN =0V
-
10
FOSC
VSENSE
ISS
SW pin
400
500
0.06
8
600
0.05
0.07
Soft Start Current
VSS=0V
-
-
uA
VSH
High (regulator ON)
Low (regulator OFF)
VEN=2.5V (ON)
VEN=0.3V (OFF)
CLX=1000pF
2.0
-
-
EN Pin Logic input threshold voltage
EN Pin Input Current
V
VSL
-
-
-
-
-
-
0.8
ISH
20
-1
-
-
-
-
uA
uA
ISL
LX Rise Time
LX Fall Time
TLXR
TLXF
60
60
nS
%
CLX=1000pF
VCC = 5V,
IOUT = 1A
VOUT = 12V
Efficiency
EFFI
-
91
-
Maximum Duty Cycle
Minimum Duty Cycle
Thermal shutdown Temp
DCMAX
DCMIN
TSD
VFB=0V
-
-
-
85
0
-
-
-
%
°C
VFB=1.5V
145
2/8
Version: B11
TS19375
PWM Step-Up Controller
Block Diagram
Vcc
Phase
Compensation
FB
Regulator
+
-
+
-
Vref=1.0V
Buffer
Driver
GATE
GND
PWM
Oscillator
Controller
EN
8uA
V
EN
Thermal
Shutdown
0.06V
SS
SENSE
Pin Function Description
Pin NO. Pin Name
Pin Description
Shutdown Control Input
H: Normal Operation
L: Shutdown Mode
1
EN
2
3
4
5
6
VCC
FB
VCC Supply pin
Feedback Pin
SS
Soft-Start pin
VSENSE
Gate
Current Limit Sense Voltage
Gate drive for external N-CH MOSFET
Signal Ground Pin
7
8
GND
NC
Non Connect
3/8
Version: B11
TS19375
PWM Step-Up Controller
Function Description
PWM Control
The TS19375 is high efficient PWM step-up controller, the pulse width varies in a range from 0 to 85%. According
to the load current, the ripple voltage produced by the switching can easily be removed through a filter because the
switching frequency remains constant. Therefore, TS19375 provide a low-ripple power over broad ranges of input
voltage and load current.
Setting the Output Voltage
Application circuit shows the basic application circuit with adjustable output version. The external resistor sets the
output voltage according to the following formula:
Table 1: Resistor select for output voltage setting
VOUT
12V
15V
18V
24V
R2
1K
R1
11K
21K
17K
30K
1.5K
1K
1.3K
Current Limit Setting
The current limit threshold is setting by the external resistor (RSENSE) connecting from SENSE pin to GND (refer the
application circuit). The internal current limit compared voltage is 60mV. When the SENSE voltage is larger than
60mV, an over-current condition is triggered. Please refer to the formula for setting the minimum current limit value:
Note: ISW(MAX) is the maximum N-MOSFET current
Inductor Selection
For most designs, Low inductance values are physically smaller but require faster switching, which results in some
efficiency loss. The inductor value can be derived from the following formula:
Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor
ripple current approximately 15% of the maximum input current 3A, ∆IL=0.45A.
Table 2: Inductor select for output voltage setting (VCC=5V)
VOUT
9V
12V
15V
18V
L1 Value
18uH
15uH
10uH
10uH
The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple
current to prevent core saturation (3A+0.25A).
4/8
Version: B11
TS19375
PWM Step-Up Controller
Function Description (Continue)
Input Capacitor Selection
The input capacitor reduces the surge current drawn from the input and switching noise from the device. The input
capacitor impedance at the switching frequency shall be less than input source impedance to prevent high
frequency switching current passing to the input. A low ESR input capacitor sized for maximum RMS current must
be used.
The capacitor voltage rating should be at least 1.5 times greater than the input voltage, and often much higher
voltage ratings are needed to satisfy.
Output Capacitor Selection
The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. The
output capacitor must have low impedance at the switching frequency. A low ESR capacitor sized for maximum
RMS current must be used. The low ESR requirements needed for low output ripple voltage. The capacitor voltage
rating should be at least 1.5 times greater than the input voltage, and often much higher voltage ratings are needed
to satisfy.
The ESR range of output capacitor is 30m~100mΩ at switch current more than 1.5A. Add a 4.7uF output bypass
capacitor in order to reduce output ripple effectively
5/8
Version: B11
TS19375
PWM Step-Up Controller
Electrical Characteristics Curve (TA=25ºC, VIN=5V, VFORWARD-LED=3.3V, unless otherwise noted)
Input Voltage vs. Output Voltage
Output Current vs. Output Voltage
Shutdown Current vs. Temperature
Feedback Voltage vs. Temperature
6/8
Version: B11
TS19375
PWM Step-Up Controller
SOP-8 Mechanical Drawing
SOP-8 DIMENSION
MILLIMETERS
INCHES
MIN
DIM
MIN
4.80
3.80
1.35
0.35
0.40
MAX
5.00
4.00
1.75
0.49
1.25
MAX.
0.196
0.157
0.068
0.019
0.049
A
B
C
D
F
0.189
0.150
0.054
0.014
0.016
G
K
M
P
R
1.27BSC
0.05BSC
0.10
0º
0.25
7º
0.004
0º
0.009
7º
5.80
0.25
6.20
0.50
0.229
0.010
0.244
0.019
Marking Diagram
Y
= Year Code
M = Month Code for Halogen Free Product
(O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug,
W=Sep, X=Oct, Y=Nov, Z=Dec)
L
= Lot Code
7/8
Version: B11
TS19375
PWM Step-Up Controller
Notice
Specifications of the products displayed herein are subject to change without notice. TSC or anyone on its behalf,
assumes no responsibility or liability for any errors or inaccuracies.
Information contained herein is intended to provide a product description only. No license, express or implied, to
any intellectual property rights is granted by this document. Except as provided in TSC’s terms and conditions of
sale for such products, TSC assumes no liability whatsoever, and disclaims any express or implied warranty,
relating to sale and/or use of TSC products including liability or warranties relating to fitness for a particular purpose,
merchantability, or infringement of any patent, copyright, or other intellectual property right.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications.
Customers using or selling these products for use in such applications do so at their own risk and agree to fully
indemnify TSC for any damages resulting from such improper use or sale.
8/8
Version: B11
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