参数资料
| 型号： | SC810ULTRT |
| 厂商： | Semtech |
| 文件页数： | 16/20页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC810ULDKR |
SC810
Applications Information (continued)
Input Over-Voltage Protection
The VIN pin is protected from over-voltage to at least 30V
above GND. When the input voltage exceeds the Over-
Voltage Protection (OVP) rising threshold (VT OVP-R ), charg-
ing is halted. When the input voltage falls below the OVP
falling threshold (VT OVP-F ), charging resumes. An OVP fault
turns off the STATB output. STATB is turned on again when
charging restarts.
The OVP threshold has been set relatively high to permit
the use of poorly regulated adapters. Such adapters may
output a high voltage until loaded by the charger. A
too-low OVP threshold could prevent the charger from
ever turning on and loading the adapter to a lower voltage.
If the adapter voltage remains high despite the charging
load, the fast thermal limiting feature will immediately
reduce the charging current to prevent overheating of the
SC810. This behavior is illustrated in Figure 4, in which V BAT
= 3.0V, I FQ = 700mA, and V VIN is stepped from 0V to 8.1V.
Initially, power dissipation in the SC810 is 3.6W.
V VIN =8.1V, V BAT =3.0V
I BAT =700mA (Initially), P DISSIPATION =3.6W (Initially)
I BAT (100mA/div)
V VIN (2V/div)
V BAT (2V/div)
Short Circuit Protection
The SC810 can tolerate a BAT pin short circuit to ground
indefinitely. The current into a ground short (while
V BAT < 1.8V) is approximately 10mA. For V BAT > 1.8V, normal
pre-charge current regulation is active.
A short circuit or too little programming resistance to
ground on the IPRGM pin (<< 2.05kΩ) will prevent proper
regulation of the BAT pin output current. Prior to enabling
the output a check of the IPRGM pin is performed to
ensure that there is suffi cient resistance to ground. A test
current is output on the IPRGM pin. If the test current
produces a voltage of sufficient amplitude, then the
output is enabled. An example with R IPRGM = 2.94kΩ is
illustrated in Figure 5, in which the test current is applied
for approximately 250μs to determine that there is no pin
short. If a short is detected, the test current persists until
the short to ground is removed, and then the charging
startup sequence will continue normally.
V IPRGM (1V/div)
V IPRGM =0V—
I BAT (500mA/div)
I BAT =0mA—
V VIN (5V/div)
V VIN =0V—
V VIN ,V BAT =0V—
400μs/div
I BAT =0mA—
1s/div
Figure 5 — IPRGM Pin Short-to-Ground Test During
Figure 4 — Thermal Limiting Example
Notice the BAT output current is rapidly reduced to limit
the internal die temperature, then continues to decline as
the circuit board gradually heats up, further reducing the
conduction of heat from the die to the ambient environ-
ment. The fast thermal limiting feature ensures compli-
ance with CCSA YD/T 1591-2006, Telecommunication
Industrial Standard of the People’s Republic of China —
Technical Requirements and Test Method of Charger and
Interface for Mobile Telecommunication Terminal , Section
4.2.3.1.
Startup
A short to ground applied to the IPRGM pin while charg-
ing will also be detected, by a different method. IPRGM
pin short-to-ground detection on the IPRGM pin forces
the SC810 into reset. When the IPRGM ground short is
removed, the charger begins normal operation automati-
cally without input power cycling.
Over-Current Protection
Over-current protection is provided in all modes of opera-
tion, including CV regulation. The output current is limited
to either the programmed pre-charge current limit value
16
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