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PDF APS39903 Data sheet ( Hoja de datos )
| Número de pieza | APS39903 | |
| Descripción | COMPATIBLE AC/DC PSR SWITCHER | |
| Fabricantes | Diodes | |
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A Product Line of
Diodes Incorporated
APS39903
PUMP EXPRESSTM COMPATIBLE AC/DC PSR SWITCHER
Description
Pin Assignments
The APS39903 is a high accuracy and low cost switching mode
power supply switcher for battery charger/adapter applications. It is
consists of a primary side regulation controller and a high voltage
transistor. The controller regulates the output voltage and current in
the primary side by piece-wise Pulse Frequency Modulation (p-PFM)
in discontinuous conduction mode (DCM). The switcher uses adaptive
source current to optimize driving current to reduce driving loss. The
system operating frequency reduces linearly from heavy load to light
load in each interval of the p-PFM, and enters constant current mode
when the load current is equal to the maximum system output current.
The output voltage and output current limit of APS39903 can be
adjusted based on the patterns of load current aligned to MTK Pump
Express protocol.
(Top View)
CPC 1
FB 2
VCC 3
CS 4
7 GND
6C
5C
SO-7
The APS39903 provides operating frequency Jitter function from light
to full load range to improve the power supply EMI performance. The
APS39903 also has built-in fixed cable voltage drop compensation
(6% of nominal system output voltage) and adjustable line voltage
compensation.
The APS39903 can work individually to achieve Ultra-Low standby
power under 5V output.
The APS39903 is packaged in SO-7.
Applications
Adapters/Chargers
Features
Compatible to MediaTek Pump ExpressTM Protocol
Ultra-Low Standby Power Consumption
Built-in NPN Transistor with 700VCBO
Valley-turn On to Reduce Switching Loss and Benefit for EMI
Piece-wise Frequency Reduction to Enhance Conversion Efficiency
and Suppress Audio Noise
±5% Constant Voltage Accuracy for 5V Output
Audio Noise Suppression
Open Circuit Protection (OCkP)
Current Sense Resistor Short Protection
Over Voltage Protection (OVP)
Over Temperature Protection (OTP)
Short Circuit Protection (SCP) with Hiccup
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
APS39903
Document number: DS37226 Rev. 2 - 2
1 of 17
www.diodes.com
October 2014
© Diodes Incorporated
1 page  
A Product Line of
Diodes Incorporated
APS39903
Electrical Characteristics (@VCC = 12V, TA = +25°C, unless otherwise specified.) (Cont.)
Symbol
Parameters
VFB@4.8V
VFB@4.6V
VFB@4.4V
VFB@4.2V Feedback Threshold Voltage
VFB@4V
VFB@3.8V
VFB@3.6V
RFB FB Pin Input Resistance
VCABLE/VOUT% Cable Compensation Ratio@5V
CONSTANT CURRENT SECTION
tONS/tSW@5V
&4.2V
tONS/tSW@
4.8V&4V
tONS/tSW@
4.6V&3.8V
tONS/tSW@
4.4V&3.6V
Maximum Secondary Duty Cycle
DYNAMIC SECTION
Conditions
–
VFB=4V
–
VFB=2V (Note 5)
VUV_H
Under Voltage of Feedback Pin for VCS_H (Note 5)
OUTPUT VOLTAGE SELECTION SECTION
VCPC_L
VCPC_H
Current Control Threshold
tON_A
tON_B
tON_C
Current Control Pattern Time
tOFF_D
tWDT Watch Dog Time
PROTECTION FUNCTION SECTION
VFB(OVP)
VCC(OVP)
VFB(SCP)
tSCP
TOTP
THYS
Over Voltage Protection
Over Voltage Protection at VCC Pin
Short Circuit Protection
Maximum Time under VFB(SCP)
Shutdown Temperature
Temperature Hysteresis
VCPC control_L
VCPC control_H
(Note 5)
–
–
–
VFB @ Hiccup
–
–
–
Note 5: Guaranteed by design.
Min
3.75
3.61
3.47
3.32
3.18
3.03
2.89
560
5
0.47
0.49
0.51
0.53
Typ
3.85
3.7
3.56
3.41
3.26
3.11
2.96
700
6
0.5
0.52
0.54
0.56
Max
3.95
3.79
3.65
3.5
3.34
3.19
3.03
840
7
0.53
0.55
0.57
0.59
Unit
V
kΩ
%
–
3.61
–
–
400
220
50
50
180
7.1
27
1.61
116
+128
+36
3.68
88
150
500
300
100
100
210
3.75
–
–
600
380
150
150
240
7.5
30
1.7
128
+140
+40
7.9
33
1.79
140
+152
+44
V
mV
ms
ms
V
V
V
ms
°C
°C
APS39903
Document number: DS37226 Rev. 2 - 2
5 of 17
www.diodes.com
October 2014
© Diodes Incorporated
5 Page 
Operation Principle Description (Cont.)
A Product Line of
Diodes Incorporated
APS39903
CCM Protection
The APS39903 is designed to operate in discontinuous conduction mode (DCM) in both CV and CC modes. To avoid operating in continuous
conduction mode (CCM), the APS39903 detects the falling edge of the FB input voltage on each cycle. If a 0V falling edge of FB is not detected,
the APS39903 stops working.
OVP & OCkP
The APS39903 includes output over-voltage protection (OVP) and open circuit protection (OCkP) circuitry. If the voltage at FB pin exceeds 7.5V,
90% above the normal detection voltage, or the 0V falling edge of the FB input can’t be monitored, the APS39903 immediately shuts down and
keeps the internal circuitry enabled to discharge the VCC capacitor to the UVLO turn-off threshold. After that, the device returns to the start
state and a start-up sequence ensues.
Short Circuit Protection (SCP)
Short Circuit Protection (SCP) detection principle is similar to the normal output voltage feedback detection by sensing FB pin voltage. When
the detected FB pin voltage is below VFB(SCP) for a duration of about tSCP, the SCP is triggered. Then the APS39903 enters hiccup mode that
the IC immediately shuts down and then restarts, so that the VCC voltage changes between VTH_ST and UVLO threshold until VFB(SCP)
condition is removed.
As to the normal system startup, the time duration of FB pin voltage below VFB(SCP) should be less than tSCP to avoid entering SCP mode. But
for the output short condition or the output voltage below a certain level, the SCP mode should happen.
Figure 8 is the APS39903 normal start-up waveform that the voltage of FB pin is above VFB(SCP) during tSCP after VCC gets to the VTH_ST, which
doesn’t enter the SCP mode. As shown in Figure 9, VOUT is short and the voltage of FB pin is lower than VFB(SCP) over than tSCP, the APS39903
triggers the SCP and enters the hiccup mode.
VTH_ST
tSCP
VCC
VFB(SCP)
VFB
5V
VOUT(SCP)
VOUT
Figure 8. Normal Start-up
APS39903
Document number: DS37226 Rev. 2 - 2
11 of 17
www.diodes.com
October 2014
© Diodes Incorporated
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet APS39903.PDF ] | |
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